130 CATALOG OF FOSSIL FISHES IN THE MUSEUM 



Measurements: cm. 

 Length, as far as preserved (to a short distance pos- 

 terior to origin of caudal keels) 69.0 



Tip of stout to origin of caudal 64 . o 



Tip of snout to line through origin of pectorals 18.0 



Span across pectorals 33 • o 



Base of pectoral 10.5 



Length (that is, height) of pectoral 12.0 



Point midway between termination of pectoral mem- 

 branes to origin of dorsal 7.0 



Base of dorsal 7.0 



Height of dorsal 7.5 



Cladoselache desmopterygius Dean 



(PL 47, and text-figs. 44, 45) 



[Mem. Amer. Mus., ix, 240, pi. xxix, and text-fig. 24, 1909] 



This species is distinguished from C fyleri, to which it is most 

 closely related, by its relatively larger fins, their difference in radial 

 formula, and by other points brought out in the description of the 

 individual specimens below. The species is represented in the col- 

 lection by three specimens. 



E 2476 Front half of a shark of medium size. It shows only one of 

 the pectoralls (fig. 44), and but one ventral. The head, 

 which is well-preserved, seems to have been more pointed, 

 at least as far as the state of preservation of the specimen 

 indicates, than in some of the other Ohio cladoselachians. 

 It exhibits seven robust gill arches; and there are eight or 

 nine banks of teeth shown in the left half of the jaw. 

 There seems no doubt that this specimen is correctly 

 referred to C. desmopterygius. 



The pectoral has 19 primary rays, 12 secondaries and 

 14 tertiaries; the ventral, 9 primaries and 2 secondaries. 



Measurements: cm. 



Tip of snout to origin of pectoral 20. o 



Distance between posterior termination of pectoral 



and origin of ventral 19 • S ' 



Base of pectoral 7.5 



Length of pectoral. 9.2 



Base of ventral 3.0 



Length of ventral ■ 2.0 



