File:A treatise on zoology (1900) (14783393225).jpg

Identifier: treatiseonzoolo09lank (find matches)
Title: A treatise on zoology
Year: 1900 (1900s)
Authors: Lankester, E. Ray (Edwin Ray), Sir, 1847-1929 Bather, Francis Arthur, 1863-1934 Goodrich, Edwin S. (Edwin Stephen), 1868-1946
Subjects: Zoology
Publisher: London : A. & C. Black
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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Text Appearing Before Image:
The pectoral girdle is formed of stout cartilages fused in themiddle ventral line. They support the skeleton of the fin, Avhicliis essentially of the typical Selachian kind, with many fan-like raysattached to a metapterygium (Fig. 134). The pelvic fin has a verysimilar but smaller .skeleton (Fig. 138). The pelvic girdle, on the 174 HOLOCEPHALI other hand, differs considerably from that of the Selachian, in thatthe two halves are not fused and the iliac process is well developed.In the male an anterior claspei-, armed with denticles and lodged in ^ac.
Text Appearing After Image:
Fir.. 130. Chlnwcra nionxtrom, L. A, ventral xlcw of thf light jjelvic tin of a male. B, vrntralview of the left half of the pelvic girdle and pelvic fin of a male (after Davidotf). C, dia;^Tainshowing the opening of rectum and urinogenital sinus in the female. «.c, anterior claspirarmed with denticles ; an, anus ; a.p, abdominal pore ; b, basipterygium ; (7, posterior claspcr ;il, iliac process ; l.d, kidney duct; orf, oviduct; p, pelvic cartilage ; p.f, pelvic tin ; pt, jwcketinto which the anterior clasper can be withdrawn ; r, radial; rl, rectum ; tr, tritid extremityof clasper; tr.c, its cartilage cut short; iig, urinogenital papilla; vg.h, its opening; vg.g,urinogenital sinus. a pouch, is borne by a cartilage attached to the girdle, at all e^entsin living Holocephali and in Squaloraja (Figs. 139, 141). Thisanterior clasper, unique amongst fish, is doubtless formed bv the HOLOCEPHALl 175 modification of the front end of the pelvic fin, just as the posteriorclasper is formed from

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