7. GALEORHINID^ — 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. 
{Carcliarias (Prionodon) milbcrti M. & H.38; Gill, Proc. Ac. Xat. Sci. 181)4,262. — Car- 
chariax cceruleus DeKay, :’,49; Linnna caudaUt DeKay. 3p4.) 
27. b. C. lamia (Kisso) .Jor. ifcGilb. 
This species was provisionally identified by Prof. Putnani from a tooth 
obtained on St. Peter’s Bank belongmg to a fish estimated to have been 
at least thirteen feet in length. {Goode and Bean.) 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 
IS- {Giinther.) 
{Carcharias lamia Gunther viii, 372 ; Prionodon lamia Goode & Bean, Bull. Essex 
lust., 1879, 30.) 
19.— ISOGOinPHODON Gill, 1861. 
Sharp-nosed Sharks. 
(Gill, .^u. Lyc. Nat. Hist. N. Y. vii, p. 410; type Carcharias {Prionodon) oxyrhynchua 
Miiller & Heiile.) 
This genus differs from Eulamia princiiially in the dentition ; the 
teeth are similar in form in both jaws, constricted at the base, cla viform 
and straight, their edges scarcely sen-ated; the snout is slender and 
rather conic and })ointed. Large sharks, of the tropical seas. 
equal ; yoiKpo-^ a nail, or iieg ; ddwy, tooth.) 
28. I. limbatus (^liiller & Heule) Gill. — Spoited-fin Sbarl'. 
“ 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 similar in form in both Jaws, namely, 
erect, constricted, on a broad base, the upper more distinctly serrated 
than the lower ; gill-o]ienings 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 oi)posite 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 
