20 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



prolonged behind, nearly midway between the pectorals and veiitrals ; 

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

 hrliind second dorsal, and much smaller: pectoral tins broad and large, 

 reaching past trout of dorsal : back slightly keeled. Smallest of our 

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

 noi-thward. Specimens from Cape Cod and from Venice apparently 

 differ in no important respect. 



i.tilitirliiiiii* hi ii n ii lux Blainvillc Fannc Franc. 1 .-">. rtt ; Mnxl>-lnx nilt/nrix ( Jiinthcr viii, 

 :;s;; Miixtrliix ruin* Ston-r, Fisli Mass. 247.) 



JO. .11. rali font ir us Gill. 



First dorsal beginning over terminal third of pectoral ; its acute point 

 not reaching to insertion of veiitrals; anterior angle of dorsal blunt ; 

 second dorsal similar to first, but smaller; snout rather more pointed 

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

 fornia. (GUI.) Scarcely different from the preceding. 



(Gill. Proc. Ac. Nat. Sri. Pliila. W14. 14-. > 



15. TRIACIS Miillcr A H.Milc, 18IW. 



ix Gill. ) 



'I'miki* Miillcr & Hcnlc, Magazine of Natural History. \ol. ii : type Trinlix 

 Miillci A- Hcnlc.) 



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 ai the root of the caudal; no lower lobe to tin- 

 caudal : 111 :-t dorsal Jin opposite the space between the pectorals and 

 \cntials. Pacific and Indian Oceans. (7/?r, three : </>-.:-. point.) 



'2 I . 'I'. > < > iiiif':isj > i:iJtas (Jirnnl. /><./ 



- Snout moderately produced, rounded. Nostril with a broad anterior 

 (lap. '1 he lirst dorsal Jin is nearly midv. ay between the pectorals and 



\eiitrals.ihe second is not much smaller than the lirst, and nearly in 

 advance of the anal. I'pper p;irts with well defined black cross bands, 

 nanower than the interspaces. A low of rounded black spots along t lie 



sides oi the body, alternating with the iiiterdorsal cross bars. Coasts 



>! ( 'alilornia." <ii< iitlit-r.} 



<;ii:inl, I'IIM-. Ac. Nat. Sci. IMiila. 1K-.I. 1'Hi : I iuni licr. \ iii. :. .!/>/< hi.-, f, /i.s A\ n\s, 

 Proe. Col. Ac. Nat. Bci. l~.M. L8. 



V'2. 't'. IH cjlei (INI > Putnam. 



<'i>lnr iiiiilorin reddish brown above, pale below, the pectoral, ventral, 

 and anal lins margined with paler; snout produced, slender; otherwise 



