384 CARCHARIID^. 



9. LEPTOCARCHARIAS. 



Leptocarias, Smith, MS. 

 The first dorsal fin opposite to the space between the pectorals and 

 ventrals, without spine. No pit at the root of the caudal ; no lower 

 caudal lobe. Membrana nictituns present. Spiracles none. Mouth 

 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 small ones on each side. 

 South Africa. 



1. Leptocarcharias smithii. 

 Trisenodon smithii, Mull. ^- Ilenle, p. 50, pi. 21. 

 Snout produced, pointed. Front margin of the nostril with a 

 rather long, tapering tentacle. The second dorsal is nearly as large 

 as the first, and much larger than, and in advance of, the anal. 

 First dorsal nearly midway between the pectorals and ventrals. No 

 distinct lower caudal lobe. 



South Africa. 

 a. Type of the species: stuffed. Cabenda Bay. From Sir A. 

 Smith's Collection. 



10. TRIACIS*. 



Triakis, Miill. i^- Hetile, p. 63. 



Rhinotriacis, Gill, Proc. Ac. Nat. Sc. Philad. 1862, p. 186. 



The first dorsal fin opposite to the space between the pectorals and 

 ventrals, without spine. No pit at the root of the caudal ; no lower 

 caudal lobe. Membrana nictitaus present. Spiracles small, behind 

 the eyes. Mouth 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 small ones on each side. 



Indian and Pacific Oceans. 



1. Triads scylliuin. 



Miill. ^ Henle, p. 63, pi. 26. 

 Snout short, rounded. Nostril with a broad rounded tentacle on 

 its anterior margin. The first dorsal fin a little nearer to the ven- 

 trals than to the pectorals ; the second is not much smaller than the 

 first, but larger than, and in advance of, the anal. Brownish, with 

 darker spots. 

 Japan. 



2. Triads semifasdata. 



Triakis californica, Gray, Chondropter. p. 56 (no characters). 



semifasciatum, Girard, Proc. Ac. Nat. Sc. Philad. 1854, p. 196, 



and U. S. Pac. B.E. Exp. Fish. p. 362. 

 Mustelus felis, Ayres, Proc. Calif. Acad. Nat. Sc. 1854, p. 17. 



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



* 1. Rhinotriacis henlei, Gill, Proo. Ac. Nat. Sc. Philad. 1802, p. 48C.— 

 California. 



