24 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOJ.OGY IV. 
aiuil, and of tho lower caudal lobe black”. [Glinther.) Tropical seas; a 
stray sj^ecimeii taken at Wood’s Hole, Mass. 
i L'iircliariax { l‘rino<U)ii) liiulxiiitx M. A H., 49 ; Cdrcharias limhaltts Giintlier, viii, 379.) 
20.— APIiI01\0I>0i\ Gill. isni. 
iSm oath- tooth ed ^ 7 / a rha. 
,Aj)rioii Miiller & Heiilc, ]»reocciipied.) 
\^Gill, Ami. Lye. Nat. Hist. N. Y. vii, 411 : type Sqitahtx pioictaius Mitch.) 
Snout more or less jiroduced and conic. ; teeth entire, without seme 
or basal cus])s, all of them narrowed on a broad base, the lower erect, 
the u])per erect or only slicjhtly oblique ; dorsal more or less posterior, 
oiiposite the space between pectorals and ventrals. (a, privative; -ptw/, 
saw ; ofh'iry, tooth ; the edges of the teeth being always entire.) 
29. A. 5>SBBlctSitgiiS (Mitch.) Gill. — Smooth-timtlml Shari'. 
•• Distance of the extremity of the snout from the mouth equals that 
between the nostrils. Pectoral fin subtalciform, extending to the end 
of the dorsal. Second dorsal much smaller than the first.” {Gunther.) 
Atlanti<i ; i)robably not common on our coast. 
(Sqnalnx piinctatiiit Mit. Lit. A Phil. Traii.s. N. Y. i, 483: Carcharias ixodon M. A H. 
a*?: Carcharias punclafnx Giiiither, viii, 3(51.) 
2 9.-SC01LI0D0W Miiller A Heiile, 1837. 
( )h It q ue-toothed ^h arl’S. 
(Miiller A Henle, tVieoniimn’st Archiv f. Natnrjr. iii : type Scoliodon laticaudus M. 
A H.) 
Sharks with the teeth entire, obli(iue and flat, the points directed 
toward the sides of the mouth, so that the inner margins are nearly 
horizontal, and i)resent a smooth cntting edge, those in front more nearly 
erect; te<*th not swollen at the base; each of them with a deep notch 
on the outer margin below the sharp point; no spiracles; a pit at base 
of tail; lirst dorsal well in front of ventrals, mneh larger than second, 
(rt-zc/.tri-, twisted or crooked; tooth.) 
39. S. tern’cP-BBOVa* (Richardson) Gill. — Sharp-nosed Shark. 
Body slender; snout dei)ressed, moderately rounded; mouth U-shai)ed, 
with a sliort labial groove at its angle, which groove extends on the 
upper jaw as well as ou the lower ; distance between nostrils greater 
than distance from nostrils to end of snout; gill-openiiigs narrow; first 
dorsal moderate, midway between pe(!torals and 'V'entrals ; second dorsal 
very small, slightly behind, and rather smaller than the anal ; anal fin 
much shorter than distance from anal to ventrals; a slight furrow along 
