'20 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOOy IV. 



prolonged behind, nearly midway between the pectorals and ventrals ; 



second dorsal smaller, Imt larger than usual in sharks ; anal slightly 



behind sec-jiul dorsal, and much smaller ; pectoral fins broad and large, 



reaching past front of dorsal ; back slightly keeled. Smallest of our 



sharks; abundant on the Atlantic coasts of both continents, especially 



nortlnvaid. Specimens from Cape Cod and from Venice apparently 



differ in no important respect. 



(dahorlniiK.s /((/;»«/«« Bliiiiiville Fauiie Frauc. 18'iy, 83; Mitskliii^ vuh/arii Gnnthtiv viii, 

 ;M>; ilii.strlii.s roiin .Storer, Fish Mass. 227.) 



ao. yi. calaforBJflcaas Gill. 



First 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 first, but smaller; snout rather more pointed 

 than in most of the species. D. 18 + 17 ; A. 18 ; P. 22. Coast of Cali- 

 fornia. {Gill.) Scarcely different from the preceding. 



(Gill, Proc. Ac. Nat. Sci. Phila. 18G4, 148.) 



15.— TRIACIS Miiller &. Heule, 1838. 



{lihinofriaciiH Gill.) 



{Tri((ki>< Miiller & Henle, Magazine of Natural History, vol. ii : type T)-iakis scjiUiu.m 

 MiilU-i- & Heulc.) 



Body compressed, elongate ; mouth 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; spiracles small, be- 

 hind the eyes; no pit at the I'oot of the caudal; no lower lobe to the 

 caudal; liit.t dorsal fin (>]>i)()sit(' the si)ace between the i)ectorals and 

 ventrals. Pacilic and Indian Oceans. (-o£tr, three; ax.'!-, point.) 



iil. T. ^osnifa^i'aaStt^ Gii-anl. — Do;/ Sludi.. 



" Snout moderately produced, rounded. Nostril with abroad anterior 



llaj). The first dorsal tin i;; nearly midway between the pectorals ar.d 



ventrals, the second is not laueli siiniller than the first, and nearly in 



advance oftlu' anal. Upper ])arts with well deilned black cross bands, 



nanower than the interspaces. A low of lounded black si)0ts alongthe 



sides of the body, alternating v>ith the interdorsal cross bars. Coasts 



of Calijornia.-' {GUnthcr.) 



(Giraid, Proc. Ac. Nat. Sci. Phila. 1854, P»li ; GUiillitr, \ iii, ;^84. — M itNtcl Hf< feU-i Ayvt'ti, 

 Proc. Cal. Ac. Nat. Sci. 18.^)4, 18.) 



•its. T. lienaloi ((Jill) Putnam. 



Color uniform lechlish brown ab()^ e, i)ale below, the pectoral, ventral, 

 and anal fins margined with j)aler; snout jjroduced, slender; otherwise 



