摘要:

A survey is made of the skulls and skeletons ofGorillain British collections. The method of recording data is described and there is a section on historical material. The localities of many specimens are listed, together with their present location.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02944.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Scoteinus balstoniis recorded from western Victoria, which constitutes a 350‐mile extension of the previously known range in Western and South Australia. Measurements of the five Victorian specimens are stated. The species selects hollow trees and under roof‐tops for diurnal retreats, where it frequently roosts within colonies ofTadarida planiceps. Breeding activity of three captive specimens is described, as are the early growth and development of a young one born in captiv

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02945.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

This paper deals with the functional morphology of the pelvic girdle and fins in various genera of hill stream cyprinid and sisorid fishes. The pelvic plate ofPseudecheneisshows the greatest modification; it is unusually large and reaches the coracoids of the pectoral arch in front.The elaborate working of the pelvic muscles and their function in bringing about effective adhesion by the pelvic fins is described in detail. The formation of a new muscle, M. pars retractor ischii of the M. mesioventralis, is reported inGarraandPsilorhynchus(Cyprinidae) and inGlyptothoraxandPseudecheneis(Sisoridae). InPseudecheneis, the complete separation of this muscle from the M. mesioventral, and modification of the M. protractor ischii, are discussed in relation to the crawling habit of the genus. The appearance of the M. arrector pel vicalis ventralis inGlyptothoraxandPseudecheneisamong sisorids has been associated with the adhesive function of the outer ray.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02946.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

All the stages ofHypoaspis(Pneumolaelaps)hyattiEvans&Till are described and figured. The mites seem to feed onTyrophagus laevis(Dujardin, 1849). The leg chaetotaxy and the development of the dorsal chaetotaxy are summarized. Egg lengths and female body lengths of several gamasids are compared.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02947.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Qualitative analysis of the gut and faeces contents of stoates and weasels is complicated by the lack of readily identifiable bone fragments, teeth, feathers, etc., of mammalian or avian prey. Often the only evidence of such prey was hair or feather fragments. Since the bulk of food taken by stoats and weasels was from these two food classes, the problem of qualitative analysis resolved itself into that of identifying these hair and feather fragments.By using the scale pattern, cross‐section and medulla type, it was possible to construct a key which would identify guard hairs of small mammals of the generic level. Feather identification was based on the structural variations to the down barbules of coverts. Using such criteria a key to the main bird orders was devise

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02948.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Three new species and one new genus of sharks are described from the South China Sea.Cephaloscyllium fasciatumsp. n. (Scyliorhinidae) has a distinctive colour pattern characterized by the presence of dark‐edged blotches and saddles; and by the lobe‐like anterior nasal flap. The colour pattern and certain developmental changes inC. umbratileJordan and Fowler are discussed.Dichichthys melanobranchusgen. n. and sp. (Scyliorhinidae) combines the distinguishing characters of three distinct genera:GaleusRafinesque,ParmaturusGarman, andApristurusCarman. This suggests thatDichichthysmay be an ancestral form from which these three genera have evolved.Etmoptems decacuspidatussp. n. (Squalidae) is distinguished primarily on the basts of the decacuspid teeth to the upper jaw; this unusually high number of cusps is shown not to have been acquired as a result of old age.The vertebral characters of all species are studied radiographica

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02949.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

The thyroid gland of the spurdog,Squalus acanthiasL., has been studied, and its growth and seasonal variations in activity described. Thyroid weight was linearly related to body weight in both sexes. There was some evidence of a period of accelerated growth of the gland at the time of attainment of sexual maturity in the females, but not in male fish. Follicular growth bore a linear relationship to thyroid growth in both sexes. This relationship was marked in the males, but in females there was a great variability in the size of the follicles. Follicular cell height also showed a linear relationship to thyroid weight in female fish but not in males. The significance of these findings, and of the sex differences in thyroid growth found in this species, are discussed in relation to other observations on the growth of the thyroid gland in fish.Seasonal variations in thyroid activity in the spurdog were studied. Female spurdogs are ovo‐viviparous, gestation lasting two years, whilst migration occurs annually; these two events could therefore be considered independently in relation to changes in thyroid activity. During the summer months, the thyroid of the adult female was slightly active, and was composed of regular follicles containing abundant homogenous colloid. There was a marked fall in thyroid weight each winter, when the gland became active and colloid was rapidly withdrawn. Finally the thyroid became structurally disorganized and almost entirely depleted of colloid reserves. Recovery occurred slowly but the thyroid had re‐entered the resting condition in spring. These changes were found in the thyroids of females in both years of pregnancy, suggesting that thyroid activity was not primarily associated with reproductive events. A consideration of the migratory movements of the adult female spurdogs showed that these coincided with periods of thyroid activity, and it is suggested that migration and thyroid activity are closely related.Seasonal changes in thyroid activity were found in adult male spurdogs. The gland was inactive during the summer months, but became active each winter. These variations were less marked than those seen in the adult females; there was little evidence of the structural disorganization and almost total withdrawal of colloid which was typical of the thyroid of the adult female spurdog in winter. Again, the annual changes in thyroid activity corresponded with the period of annual migration, suggesting that the two are related. The differences in the thyroid activity of the sexes are believed to be associated with their markedly different reproductive cycles. Juvenile spurdogs of both sexes, which do not make regular seasonal migrations, showed no marked seasonal fluctuations in thyroid activity; this provides further evidence of the close link between thyroid activity and migration in the spurdog.The development of the thyroid gland in the intra‐uterine embryo is described. In the smallest embryos (2 cm in length) the thyroid consisted of a simple aggregate of epithelial cells; primitive thyroid follicles were first seen in embryos of 8 cm. Follicular differentiation and growth were continuous throughout intra‐uterine life, and were accompanied by a progressive accumulation of colloid; there was no evidence of an abrupt structural or functional differentiation of the thyroid at any stage during gestation.Conspicuous seasonal changes were found in the activity of the thyroid gland of the intra‐uterine embryos. During the winter months, in both years of gestation, the foetal thyroid became depleted of colloid reserves and structurally disorganized. These changes occurred in small embryos during their first yearin uterobut were more readily seen in the larger embryos where the thyroid had become well differentiated. The recovery of the embryonic thyroid was rapid, and the gland was reorganized in both near‐term and newborn young. The changes in the embryonic thyroid closely resembled those seen in the thyroid of the pregnant female. The significance of this is discussed in relation to the existence of a functional link between maternal and foetal thy

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1966.tb02950.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY