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Bdshford Dean Memorial Volume 



Text 'figure 48. 

 Endoskeleton of dorsal and anal fins of Chlamydoselachus anguineus. 



a, radial of dorsal fin; b, radial of anal fin; c, anterior radial of caudal fin. 

 After Garman, 1885.2, pi. XIII. 



The great extent of the band compared with the size of the fin, and the manner in which 

 it dwindles toward the front, taken in connection with the fact of the continuation of the 

 peculiar scales of the fin-border some two inches in front of the cartilages, show that in 

 ancestral forms of this animal the dorsal fin was much longer, and corresponded more nearly 

 in proportions with the anal. 



The only additional figure of the adult dorsal fin skeleton that I have found is 

 Deinega's (1909 and 1923), which is reproduced as my Text-figure 49. This figure is 

 instructive in that it shows clearly a much greater number of cartilaginous elements 

 than is shown in Carman's drawing (my Text-figure 48). Deinega distinguishes a series 

 of thirty'two basal elements which he calls radials, whereas in Carman's figure there are 

 scarcely half as many of these elements, which he also calls radials. 



Text'figure 49. 

 Endoskeleton of the dorsal fin of Chhmydoselachus anguineus. 



m., fin membrane; 1-32, first row of radials (no. 1 not shown). 

 After Deinega, 1909, Fig. 12, pi. Ill, 



