200 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Triakis venusta Gabman, Mem. Mus. Comp. Zool., vol. 36, p. 456, 1913 (Sagami 

 Sea ) .—Fowler, Proc. 4th (1929) Pacific Sci. Congr. Java, p. 490 (reference), 

 1930. 



Depth 9% to subcaudal origin; head 7, width I14. Snout 2% 

 in head ; eye 4, 1% in snout, 2 in interorbital ; mouth width 2 in head, 

 length 2y^ its width or li/^ in preoral, labial folds short ; teeth small, 

 subequal, slightly inclined outward, with larger median and 2 or 3 

 lateral cusps each side; nostrils about last third in preoral length, 

 internarial about % in width between outer nasal borders; inter- 

 orbital 21/^ in head, low. Last 2 gill openings closer, above pectoral. 



Scales small, each with median keel ending in point behind, slight 

 obtuse point widely each side. 



First dorsal origin much nearer ventral origin than pectoral, front 

 fin edge 1 in head; front second dorsal edge 1; front anal edge 2, 

 origin little before second dorsal origin; least depth of caudal pe- 

 duncle 414 in head; pectoral 1, not reaching dorsal origin, width 

 11/2 its length ; ventral length li/^ in head ; caudal Sj^ in rest of body, 

 front subcaudal edge 314 in caudal length or 1% in head. 



Light sepia, pale beneath. Numerous dark brown spots, irregu- 

 larly scattered on upper parts of body and fins except anal and under 

 surface of pectoral and ventral. About 17 indistinct clouded like 

 saddles on back. Length, 645 mm. (Tanaka.) 



Japan. The type No. 3398, Science College Museum, Tokyo. 



Genus ERIDACNIS H. M. Smith 



Eridacnis H. M. Smith, Proc. U. S. Nat. Mus., vol. 45, p. 599, 1913. (Type, 

 Eridacnis radcliffei H. M. Smith, orthotypic.) 



Body elongate, rather slender, compressed. Head moderate. Eye 

 with nictitating membrane. Mouth wide, angular, without labial 

 folds. Teeth small, erect, pluricuspid, alike in jaws. Gill openings 

 rather narrow, last 2 or 3 above pectoral. Spiracle moderate, close 

 behind eye. Scales tridentate. Dorsals subequal, first entirely be- 

 fore ventrals. Anal opposite second dorsal, much smaller. No 

 caudal pits. Caudal long, nearly straight, notch near tip, subcaudal 

 little distinct. Pectorals rounded. 



Small, deep water, viviparous sharks. One species. Differs from 

 Triakis chiefly in the absence of labial folds. 



ERIDACNIS RADCLIFFEI H. M. Smith 



Eridacnis radcliffei H. M. Smith, Proc. U. S. Nat. Mus., vol. 45, p. 599, pi. 47, 

 1913 (type locality: Off Jolo, Sulu Islands, in 161 fathoms). — Fowler, Proc. 

 4th (1929) Pacific Sci. Congr., Java, p. 490, 1930 (reference).— Roxas and 

 Martin, Dept. Agr. Comm. Manila, Tech. Bull 6, p. 14, 1937 (reference). 



Depth hy^ to 5% to subcaudal origin ; head 4 to 4%, width II/4 to 

 ly^- Snout 2% to 3 in head; eye 31/2 to 4, 1 to I14 in snout, ly^ 



