摘要:

The pronephric systems of young larvae ofAmbystoma mexicanum, Hynobius nebulosus, Cryptobranchus japonicusandRana esculentawere quantitatively analysed and compared with each other and with previous data ofNeoceratodus.The morphological arrangement of the nephrostomial units was described.Cryptobranchushad the largest pronephric system among the urodeles. In terms of total larval length a comparison of the regression lines of a variety of pronephric components showed some of them to grow faster inCryptobranchusthan in axolotl, but the slopes of the regression lines of all components ofHynobiuswere not significantly different from those in axolotl. In all genera within the range of development studied the pronephric nuclear population, total pronephric tissue volume and overall pronephric volume increase with increase of larval length except inRana, where the latter component measurement is stable from 17 mm. onwards. Glomus volumes and glomus external surface areas, except those forNeoceratodus, continue to enlarge. The pronephric cell volume size range is of a similar order in all genera except inCryptobranchuslarvae from 26 mm. to 32 mm. in length where it is considerably higher.

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05874.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Reports dating back to 1912 of a remarkable foxy‐red coloured goral or goat‐antelope(Nemorhaedus)from S.E. Tibet and N.E. Assam have been investigated. In 1931 Lord Cranbrook collected a specimen of this goral in the Adung Valley, Upper Burma, and recently Mr H. L. Cooper has presented to the British Museum (Natural History) a rug made of skins of three of these gorals taken in 1922 in the Mishmi Hills of Upper Assam. Study of these specimens has led to the proposal of a new species ofNemorhaedusbased not only on colour but also on comparative size and proportions. A colour plate of skins of the new animal is gi

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05875.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05876.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The gross pattern of innervation of the larynx is described in twenty‐six species of eutherian mammals. The presence of an internal and recurrent laryngeal nerve is constant in all these species but the communications between the two nerves are variable. Four different types are described. The possible significance of variation in the pattern of innervation is discusse

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05877.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

This new piscicolid leech (subfamily Ichthyobdellinae) was found attached to the branchiae and inner surface of the branchial chamber ofDrepanopsetta platessoides, trawled off Iceland. It has a fairly extensive coelomic system with no clear separation into dorsal, ventral and segmental lacunae. Its posterior crop caeca are separate and there are only eighteen separate ganglia between the anterior and posterior ganglionic masses.

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05878.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

Five specimens of a new leech were found attached to fin‐rays of the dorsal and caudal fins ofCottus bubalis.The posterior sucker is folded laterally so that it can partially enclose a fin‐ray. These small, smooth‐skinned leeches resemblePlatybdellain some respects,Abranchusin others. The coelomic system consists only of dorsal and ventral lacunae, the posterior crop caeca are separate and the dermis is narrow. There are only eighteen separate ganglia between the anterior and posterior ganglionic m

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05879.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The development and topographical anatomy of the gorilla frontal sinus are described from late foetal life to senescence and details are given of its pneumo‐osteolytic role in relation to that of the other paranasal sinuses. The adult sinus is shown to manifest one or other of two distinct morphological patterns and these to be determined by the more dominant maxillary sinus. Examples of frontal sinus perforative osteolysis are instanced and frontal sinus homologies are briefly discusse

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05880.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

A general description of the skull of a particularly well‐preserved specimen ofDaptocephalus leoniceps(Owen) is given and the surface features of the septomaxilla described; it is suggested that this bone may have supported a nostril‐closing valve and thatD. leonicepsmay have been slightly amphibious. The conformation of the bones in the pterygoid region is described and attention is drawn to an arrangement which may prove to be a useful systematic character. A description of the masticatory apparatus is given and its mode of action is discussed, as are the homologies and significance of the labial fossa. The auditory region is described. A description of a small bone, interpreted as an ossified extra‐stapes, is given and the position of the tympanum is discussed. The proatlas, atlas and axis are described and a restoration of the neck muscles is made. Some of the bones of the manus are described and the functional significance of a number of the characteristics of the genusDaptocephalusis briefly out

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05881.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

The breeding season of three ascidians in Jamaica has been studied by counting the number of newly settled individuals each week on microscope slides suspended in the sea. Settlement occurs throughout the year with greatest numbers in autumn and early winter. These peaks cannot at present be correlated with any specific environmental influence.

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05882.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY

摘要:

In the early second‐instar larva the reproductive system comprises a pair of undifferentiated ovary‐rudiments, each produced posteriorly into a solid strand of cells—the mesodermal lateral oviduct rudiments. Later in the second instar a spermathecal rudiment arises from the epidermis of the eighth abdominal segment and ovipositor valve rudiments from the eighth and ninth sterna. By the early prepupa the lateral oviducts acquire ampullae and the ectodermal structures are supplemented by a common oviduct rudiment (from the seventh sternum) and an accessory gland rudiment (from the ninth sternum). Further growth of these is followed in the pupa by the development of the vagina through ventral closure of a mid‐sternal groove on the eighth segment and by the division of the ovary rudiment into ovarioles. Meanwhile the ovipositor valves have increased in length and some of their muscles have arisen by differentiation of previously unorganized masses of myoblasts; the remaining ovipositor muscles are formed from larval muscles which change their positions but are otherwise unaltered. Though the reproductive system ofLimothripsis morphologically comparable to that of less specialized Exopterygota, its development is shown to be delayed in a manner more reminiscent of the endopterygote

ISSN:0370-2774    

DOI:10.1111/j.1469-7998.1961.tb05883.x

出版商:Blackwell Publishing Ltd    

年代:1961

数据来源: WILEY