56 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



corners of mouth 2 smaller basal cusps each side, most all lower teeth 

 with 2 basal small cusps each side ; nostrils oblique, longer than eye, 

 internarial greater than either nostril or 2 in mouth width or 2% in 

 preoral length, which 1% in head; interorbital 2%, broadly (dam- 

 aged) and slightly convex. Last gill opening largest, last 2 over 

 pectoral base. Spiracle small, close behind eye. 



Scales very minute, tridentate, points all slender, median longest, 

 each smaller lateral well free. 



First dorsal origin little before ventral base, fin length 24^ in 

 head; second dorsal origin slightly behind middle in anal base, fin 

 length 2% in head ; anal length about equals head, height about 3% 

 in base length ; subcaudal length equals 1% head lengths, depth about 

 Yq its length; pectoral width ly^ its length, which 1% in head; 

 ventral 1%. 



Uniform brown. Inside mouth and gill openings black. 



Approaches Scyliorhinus indiciis Brauer, differing in that the inter- 

 narial is greater than the eye, pectorals much greater than postocular 

 region to last gill opening, middle of ventrals falls at first ■% of total 

 length, origin of first dorsal well before middle in total length and 

 long caudal more than y^ total length. 



U.S.N.M., No. 93134, D. 5424, Cagayan Island (S.), S. 11° W., 3.4 miles (lat. 

 9° 37' 05" N., long. 121° 12' 37" E.), Jolo Sea. March 31, 1909. AlMtross 

 collection No. 10261. Length, 312 mm. Type. 



Subgenus Pentanchus Smith and Radcliffe 

 Nasal valves with at least small cirrus anteriorly. 



PENTANCHUS MACRORHYNCHUS (Tanaka) 



ScyliorJiinus macrorJiynchus Tanaka, .Tourn. College Sci. Tokyo, vol. 27, p. 1, 

 1909 (type locality: Misaki, Sagami). 



ScylUorhinus macrorhynchas Izuka and Matsuuea, Cat. Zool. Spec. Tokyo Mus., 

 (Vertebrata), p. 190, 1920 (Misaki). 



Apristurus macrorJiynchus Garman, Mem. Mus. Comp. Zool. vol. 36, p. 97, 1913 

 (Misaki).— FowLEHi, Proc. 4th (1929) Pacific Sci. Congr., Java, p. 485, 1930 

 (reference). — J. Schmidt, Compt. Rend. Acad. Sci. U. S. S. R., vol. 11, p. 

 630, 1930 (Misaki).— J. Schmidt, Trans. Pacific Comm. Acad. Sci. U. S. S. R., 

 vol. 11, p. 5, 1931 (Misaki).— Tanaka, Jap. Fish. Life Colours, no. 10, 1933. 



Depth 9% to subcaudal origin, body elevated, rather slender ; head 

 4, depressed. Snout 1% in head, long, acutely pointed, rather rounded 

 as seen above; eye 5%, lateral, elevated; mouth width 2^4, large, 

 moderately curved, lower labial fold little less than half space to 

 symphysis and upper labial fold II/2 times long as lower; preoral 

 length slightly less than 2 in head; teeth tricuspid, median cusp 

 largest, subequal; internarial 6, each valve with anterior cirrus; 

 interorbital 2%, gently convex. Gill openings small, median longest, 

 last 2 closer and last above pectoral base. Spiracle very small, sub- 

 circular, directly behind eye. 



