摘要:

A review of the major papers on the 'genitalia' of calyptrate Diptera indicates the need of establishing the evident homologies within the group, studying homologies with other forms, studying the rotation of the parts known to occur in some forms, and studying the musculature.Goniahas 'sternite V' of the abdomen, and all succeeding segments, modified for effecting copulation. The 'posterior angles of sternite V' are produced. A small apparent 'tergite VI' may be secondarily cut off from the previously fused segments VI and VII. A narrow 'tergite VII' articulates on the left side with an asymmetric 'sternite VI and VII'. Segment VIII has disappeared. 'Tergite IX', the genital tergite, is large. 'Sternite IX', a shovel-shaped ventral sclerite, is anterior to the 'phallus'. Segment X is represented by the 'lateral lobes of sternite X', the 'tenth sternal plate', and the 'anal forceps' and, in related forms, (not inGonia), by the 'parapodial plates'.The 'phallus' consists of a 'phallobase' with 'dorsal spine', a bell-shaped 'aedeagus', and protrusible 'penis'. The 'aedeagus' is formed of a dorsal 'paraphallus', lateral 'hypophalli', membranous 'ventralia', and apical membranous 'praeputium'. Anterior and posterior pairs of 'basal phallic appendages' surround the 'phallobase'. Internally a 'double apodeme' extends forward.The term 'genitalia' is used to refer to the entire modified apex of the abdomen.

ISSN:1923-4287    

DOI:10.1139/cjr41d-001

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

Measurements of the colour and colour stability of Wiltshire bacon, cured in a factory known to produce a generally satisfactory product, showed that there were small but significant differences in these properties from time to time, but there was no definite evidence to indicate that these differences could be attributed to systematic seasonal effects.

ISSN:1923-4287    

DOI:10.1139/cjr41d-002

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

The internal trematodes from fish in the late Dr. Stafford's slide collection have been restudied and described.Gasterostomum armatumof Stafford is identified withProsorhynchus squamatusOhdner, 1905, andCrepidostomum laureatumwithC.cooperiHopkins, 1932.Homalometron pallidumStafford, 1904, is redescribed and it is suggested that the genusHomalometronStafford, 1904, is synonymous withLepocreadiumStossich, 1904.Neophasis pusillaStafford, 1904, andStenakron vetustumStafford, 1904, are redescribed and assigned to the familyAllocreadiidae.Hemiurus appendiculatusof Stafford, is demonstrated to representH.levinseniOhdner, 1905, andBrachyphallus crenatusRudolphi, 1802, whileFellodistomum incisumof Stafford represents the speciesF.fellisOlsson, 1868, andF.agnotumNicoll, 1909. Species of the generaAzygiaandOtodistomumare reidentified.Protenteron diaphanumStafford, 1904, is redescribed and the species is referred to the genusCryptogonimusOsborn, 1903, the new combination beingCryptogonimus diaphanus.

ISSN:1923-4287    

DOI:10.1139/cjr41d-003

出版商:NRC Research Press    

年代:1941

数据来源: NRC