The Anatomy of Chlaynydoselachus 



375 



figure of the fossil Cladoselache (my Text' 

 figure 44). 



In the female Chlamydoselachus, the 

 skeleton of the pelvic fin proper (Text- 

 figures 43 and 89, the latter on p. 434) is 

 much like that of Heptanchus as figured by 

 Gegenbaur (1870, Fig. 3, Taf. XV); and as 

 shown in my Text-figure 45a, after Daniel. 

 In Chlamydoselachus the basipterygium is 

 shorter and more of the radials are attached 

 directly to the pelvis. There is very little 

 fusion of radials in the pelvic fins of either 



liin 



ml 



II !■■ 



Text-figure 46. 



Pelvic fin skeleton of a male Chlamydoselachus: 



A, viewed obliquely from above; B, viewed from 



the inner (ventral) side. 



Be, medial radial belonging to the myxopterygium; Bm, abdom- 

 inal musculature; mt, metapterygium; Mx, principal radial 

 of the myxopterygium; P, pelvis; R, radials; T, pocket of the 

 myxopterygium; TO, opening of the pocket. 

 After Braus, 1902, Abb. 7 and 8. 



Text-figure 45. 



Skeleton of the pelvic fin and girdle of Heptanchus 



maculatus: A, female; B, male. 



Be, beta cartilage; b.l — 2, first and second connecting segments 

 ha., basal or axial cartilage; ba.p., basipterygium; pi., pelvis; 

 ra., radials. 

 After Daniel, 1934, Fig. 55. 



Chlamydoselachus or Heptanchus, and this 

 fusion is confined to the anterior end of the 

 fin skeleton where some plates of cartilage 

 may be regarded as rudimentary basals. In 

 Deinega's drawing (1909 and 1923) of the 

 pelvic fin of Chlamydoselachus, it is difBcult 

 to determine the number of segments in the 

 radials — the row of small distal segments is 

 either not well shown or is absent. 



Pelvic Fins and Pelvis of the Male. — 

 In the male Chlamydoselachus, the skeleton 

 of the pelvic fins, together with the pelvis, 

 has been fully described and figured by Braus 

 (1902) and by Goodey (1910.1). Their figures 

 are reproduced as my Text-figure 46 and my 

 Figure 21, plate V. By comparison with 

 Text-figures 42, 43, and 89 (p. 434) it will 



