132 



CATALOG OF FOSSIL FISHES IN THE MUSEUM 



The pectorals are fairly well preserved. They show 19 

 or 20 primary, 8 secondary, and 8 tertiary rays. There 

 were probably several additional tertiaries, but they are 

 not shown. The shagreen covering the pectoral fin is 

 present in places, and the fin itself seems thick and fleshy. 

 Both ventral fins are preserved. They are rather small, 

 and broken posteriorly, but probably ran out into narrow 



Fig. 45. Cladoselache desmopterygius. Body of a Shark, Displaying the Pec- 

 torals {p), Ventrals (d), and One Dorsal {d). X j. E 2478 



membranes along the margins of the body. They show 

 9 or 10 primary, and 6 secondary rays; there are, appar- 

 ently, no tertiaries. In addition to the pectorals and 

 ventrals, there is another fin present, evidently the dorsal. 

 It is situated 11. 5 cm. behind the posterior margin of the 

 pectoral. It shows 10 primary rays and 5 secondaries; 

 its height is 3 cm., and base 3.5. 



