BUFFALO SOCIETY OF NATURAL SCIENCES 129 



Measurements: cm. 



Distance from pectoral fins to tip of caudal 45 o 



Span across pectorals 26.0 



Base of pectoral 3.5 



Length of pectoral 9.0 



As seen from these measurements, the pectoral (fig. 43) 

 is nearly three times as high as wide, and can therefore 

 be compared only with that of C. acanthopterygius. It 

 has 14 to 16 primary rays and 8 secondaries; the latter 

 are closely crowded and partly overlap. Tertiary rays, if 

 present, cannot be distinguished in this specimen. 



Cladoselache brachypterygius Dean 

 (PI. 46) 



[Mem. x\mer. Mus., ix, 240, pi. xxxii, and text-figs. 22, 23, 1909J 



E 2475 We refer to this species a large, fairly well-preserved shark 

 about 2)2 fset in length, lacking the caudal extremity. 

 We base our determination on the relative shortness of 

 the pectoral fins, and on their ray formula. The speci- 

 men shows both pectoral fins, and a single dorsal. The 

 latter lies in a plane at right angles to that of the pec- 

 torals. The pectoral is broad in proportion to the' size 

 of the fish, its base measuring about 14 per cent, of the 

 total length of the shark. In the head region, the orbits, 

 Jaws and teeth are preserved, and farther back are some 

 muscle segments. The ventral fins are not preserved. 



The pectoral fin is relatively short, its height being 

 only a little greater than its base, due to the prolongation 

 of the fin-fold. Its extremity is broadly rounded, not 

 drawn out to a point. The hinder web extends beyond the 

 rays, and is prolonged for a short distance along the side 

 of the body. The fin has 21 primary, 9 secondary, and 

 2 tertiary rays. 



The position of the dorsal seems to be more forward 

 in this species than in C. fyleri. This fin shows 19 pri- 

 mary rays, rather crowded together, but no secondary 

 rays can be distinguished. 



