FISHES OF THE PHHilPPINE ISLANDS AND ADJACENT SEAS 197 



or denticles. Front nasal valve with rounded lobe. Last gill open- 

 ings above pectoral base. Spiracles small, behind eyes. First dorsal 

 above space between pectorals and ventrals. Second dorsal above 

 anal. Caudal short, no pit at origin and notch behind small 

 subcaudal. 



Small sharks, without caudal pits and often blotched or spotted. 



ANALYSIS OF SPECIES 



a.\ Teiakis. Interuarial more than half preoral length ; outer fin edges concave. 



5\ Coloration nniform brownish leucoperiptera 



b". Coloration brown, with darlver obscure cross bands and scattered black 



spots scyllium 



a\ Calliscyxlium. Inner interuarial % outer interuarial width, less than half 

 preoral length; outer fin edges scarcely concave; coloration greatly varie- 

 gated with small dark spots over upper surface of body venusta 



Subgenus Triakis Miiller and Henle 



TRIAKIS LEUCOPERIPTERA (Herre) 



HemitriaJcis leucoperiptera Hebre, Philippine Journ. Sci., vol. 23, p. 71, pi. 1, 

 1923 (type locality: Dumaguete, Philippines) ; Journ. Pan-Pacific Res. Inst., 

 vol. 8, No. 4, p. 6, 1933 (Dumaguete) ; Fishes Herre Philippine Exped., 

 1931, p. 12, 1934 (Dumaguete). — Roxas and Martin, Dept. Agr. Comm. 

 Manila Techn. Bull. 6, p. 14, 1937 (reference). 



Triakis lencoptera Fowler, Proc. 4th (1929) Pacific Sci. Cougr., Java, p. 490, 

 1930 (reference). (Error.) 



Depth 5% to 7% to subcaudal origin; head 4 to 5i/^, width about 

 114. Snout 2% to 21/2 in head; eye 4 to 534, 1% to 2I/3 in snout, 

 trifle less than 2 in interorbital ; mouth width 2^ in head, length 

 21/2 its width, labial folds large, upper longer than lower or about 

 % upper jaw; teeth in 18 rows above, 34 below, strongly oblique with 

 longer sharp pointed cusp and 2 or 3 much smaller denticles on 

 outer side; lower median teeth with no to 3 small basal denticles 

 each side; remaining rows of teeth smaller than opposing upper 

 teeth, strongly oblique, with larger cusp directed toward mouth angle 

 and 1 to 4 minute cusps on denticles on outer side; nostrils about 

 midway in preoral, each front valve with outer triangular pointed 

 flap near inner angle of nostril and under and at right angles smaller 

 dividing fold or flap, interuarial 1% in preoral length; interorbital 

 low. Gill openings with third largest, last smallest, last 2 over 

 pectoral. 



First dorsal origin before hind inner pectoral angle, front fin edge 

 114 to 11/2 in head; front edge of second dorsal 1^ to 1%; front 

 anal edge 214 to 2%, origin below middle of second dorsal base; least 

 depth of caudal peduncle 5% to 6 ; ventral length 1% to 2% ; pectoral 

 1 to 11/2, width 1% its length, which reaches nearly opposite hind 

 first dorsal basal edge with age; caudal 3 to 3% in rest of body, 

 subcaudal 2I/2 to 2% in caudal or 1% to 2 in head. 



