7. GALEORHINID.E ISOGOMPHODON. 23 



higher thiiii in the i)recediiig, luid witli the pectoral fius considerably 

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

 Cape Cod to the INIediterranean Sea. 



{Carcharim {Prionodon) mUlnrii M. A: H. :W ; (;ill, Pioc Ac Xat. .Sci. I8f)4, 2tJ2.— C'ar- 

 chariaa cwruhus DcKay, o4y ; Ltnnita cauddia DeKay. '^^A.) 



27. h. C. lamia (Kisso) Jor. cV-, Gilb. 



This species was provisionally identitied by Prof, Putnam from a tooth 

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

 at least thirteen feet in length. [Ooode and Bean.) lu this species the 

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

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

 IS- {Giinther.) 



{Careliarias latnia Giiiither viii, ;!72 ; I'lionodoii lamia Ooodi! & l^eaii, Bull. Essex 

 Inst., 1871), :?0.) 



19.~ISOGOI»IPHODOW Gill, 1861. 

 Sharp-nosed Sharks. 



(Gill, Anu. Lye. Nat. Hist. N. Y. vii, p. 410: type Carchariaa {Prionodon) oxyrhyuchna 

 Miillor & Henle.) 



This genus dilfers from Eulamia principally in the dentition ; the 

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

 and straight, their (Mlges scarcely serrated; the snout is slender and 

 rather conic and pointed. Large sharks, of the tropical seas. (-''ff"T, 

 equal ; /'o/z^'-ot, a nail, or peg ; o(Ja», tooth.) 



28. I. limbatus (Miiller A: Hful«0 Gill. — Spoited-fm 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 ^yEi)? ^^indlar 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 Mide as the eye, 

 Avhich is small ; pectorals fiilciform, extending beyond the end of the 

 dorsal, the length of their u])})er margin being nearly four times that of 

 the lower. First din'sal 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 

 ui)per 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 i)ectoral, and the extremities of the second dorsal and 



