20 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOOy IV. 
prolonged behind, nearly midway between the pectorals and ventrals ; 
second dorsal sinaller, bnt larger than usual in sharks; anal slightly 
behind seCvmd dorsal, and inueh smaller; pectoral tins broad and large, 
reaching past front of dorsal ; back slightly keeled. Smallest of onr 
sharks ; abundant on the Atlantic coasts of both continents, especially 
northward. S])ecimens from Cape Cod and from Yenice apparently 
(litter in no important respect. 
{ (ialcorliiiiKfi Blainville Fiiune Franc, lrf'28, H.l; rtihjaris (iimthev viii, 
as(i ; JIkkIcIiis rtniin Storer, Fi.sli Mas.s. 2'27.) 
20. csalifoniifiis Gill. 
Cii st dorsal beginning over terminal third of pectoral ; its acute point 
not reaching to insertion of ventrals; anterior angle of dorsal blunt; 
second dorsal similar' to tirst, but smaller ; snout rather more pointed 
than in most of the species. 1). IS + 17 ; A. 18; P. 22. Coast of Cali- 
fornia. {GUI.) Scarcely different from the preceding. 
(Gill, Proc. Ac. Nat. Sci. Phila. 18(54, 148.) 
15.— TKIACIS Miillcr & Henle, 1838. 
{lilthiotriacifi Gill. ) 
( Triaki's Miillcr & Henle, Magazine of Natnral Hifstory, vol. ii : type Ti’iakis sci/Uium 
Miiller & Henle.) 
Body compressed, elongate ; month large, crescent-shaped, with well- 
developed long labial folds ; teeth small, numerous, similar in both 
Jaws, each with a longer median cusp, and one or two smaller ones on 
each side ; eyes small, with nictitating membrane ; siiiracles small, be- 
hind the eyes; no pit at the loot of the caudal; no lower lobe to the 
caudal ; lirst dorsal tin o])])osite the space between the i>e(;t(uals and 
ventrals. I’acilic and Indian Oceans. thr(‘e ; ayJ'. point.) 
21. Ginird. — /+•/ Sh<trk. 
“ Snout moderately ])roduced, rouiuhMl. Nostril with a brojid anterior 
llaj). The lirst dorsal lin is nearly niidway between the pectorals and 
ventrals, the S(‘Cond is not inueh smallei' than the tirst, and nearly in 
advance of the anal. Upper jiai'ts with well delined black cross bands, 
narrower than the intersi>aces. A row of I'ouuded black s])ots along the 
sides of the body, alternating with the interdorsal cross bars. Coasts 
of California.” {Giinther.) 
(Giiiiid, Proc. A(‘. Nut. Sci. Pliilu. 1854, 19(5 ; Gunther, viii, 384 . — Alutiieliifi feHx Ayres, 
Proc. Cal. Ac. Nut. Sci. 18.54, 18.) 
2 2. T. Bieesioi (Gill) Putnam. 
Color unilbrm reddish brown above, i>ale below, the pectoral, ventral, 
and anal tins margined with paler; snout produced, slender; otherwise 
