7. GALEORHINID^E ISOGOMPHODON. 23 



higher than in the preceding, and with the pectoral fins considerably 

 shorter and broader, not reaching half way to the ventrals. 

 Cape Cod to the Mediterranean Sea. 



(Carcharias (Prionodon) milberti M. & H. 38^ Gill, Proc. Ac. Nat. Soi. 1864, 262. Car- 

 charias catmleus DeKay, 349; Lamna candata DeKay, 354.) 





 27. 1>. C. lamia (Risso) Jor. & Gilb. 



This species was provisionally identified by Prof. Putnam from a tooth 

 obtained on St. Peter's Bank belonging to a fish estimated to have been 

 at least thirteen feet in length. (Goode and JJean.) In this species the 

 upper teeth are little oblique, serrated, broad, and regularly trian- 

 gular ; dorsal large ; the second dorsal smaller than the anal ; teeth 



S (CWnther.) 



(Carcharias lamia Giinther viii, 372; Prionodon lamia Goode & Bean, Bull. Essex 

 lust., 1879, 30.) 



.19. ISOGOMPHODON Gill, 1861. 



Sharp-nosed Sharks. 



(Gill, Ann. Lye. Nat. Hist. N. Y. vii, p. 410: type Carcharias (Prionodon) oxyrhynchus 

 Miiller & Henle.) 



This genus differs from Eulamia principally in the dentition ; the 

 teeth are similar in form in both jaws, constricted at the base, claviform 

 and straight, their edges scarcely serrated; the snout is slender and 

 rather conic and pointed. Large sharks, of the tropical seas. (?<rc, 

 equal ; Yu>j.<po~, a nail, or peg ; eJ<5<bv, tooth.) 



28. I. limbatus (Miiller & Henle) Gill. Spo tted-Jin Shark. 



" Snout somewhat pointed in front, rather produced, the distance 

 between its extremity and the mouth being somewhat less than the 

 width of the mouth ; nostrils nearly midway between the extremity of the 

 snout and the mouth; teeth i^ 2 |, similar in form in both jaws, namely, 

 erect, constricted, on a broad base, the upper more distinctly serrated 

 than the lower ; gill-openings wide, at least twice as wide as the eye, 

 which is small ; pectorals falciform, extending beyond the end of the 

 dorsal, the length of their upper margin being nearly four times that of 

 the lower. First dorsal commencing very close behind the axil of the 

 pectoral ; origins of the second dorsal and anal opposite to each other, 

 the bases of both being nearly equally long. Caudal fin long, with the 

 upper edge slightly undulated, its length being equal to the distance 

 between the origins of the two dorsal fins. The lower side of the ex- 

 tremity of the pectoral, and the extremities of the second dorsal and 



