FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 13 



(Vertebrates) p. 191, 1920 (Tokyo market). — Jordan and Htjbbs, Mem. 

 Carnegie Mus., vol. 10, p. 99, 1925 (Sagami Bay).— Fowler, Proc. 4th 

 (1929) Pacific Sci. Congr., Java, p. 4Si, 1930 (Japan).— Soldatov and 

 LiNDBEKG, Bull. Pacific Sci. Fisher. Inst, vol. 5, p. 4, 1930 (Far East seas). — 

 Schmidt, Trans. Pacific Comm. Acad. Sci. U. S. S. R., vol. 11, p. 3, 1931 (To- 

 kyo ) .—Tanaka, Jap. Fish. Life Colours, No. 5, 1933.— Fowler, Bull. Amer, 

 Mus. Nat. Hist., vol. 70, pt. 1, p. 24, fig. 2, 1936 (Japan). 



Chlamydoselache anguinea Gunthek, Rep. Voy. Challenger, vol. 22, p. 2, pis. 

 64, 65, 1887 (Yeddo Bay opposite Tokyo). 



Didymodus anguineus Cope, Amei*. Nat., vol. 18, p. 413, 1884 (note). 



Chlamydoselachus sp. Ste:ad, Proc. Liuu. Soc. New South Wales, vol. 32, p. 554, 

 1907 (Port Jackson). — McCulloch, Fishes of New South Wales, ed. 2, 

 1927, p. 4. 



Depth 8% to subcaudal origin ; head measured to hind edge of first 

 gill opening 5i^, width 1%. Snout 3I/5 in head ; eye 8I/3, 2% in snout, 

 31^ in interorbital, depth 1% its length ; mouth cleft, from snout tip 

 1% in head, width I14 its length; teeth in 13 rows each side above 

 though without median row in front, 11 rows each side below with 

 row at symphysis, not over 6 teeth in row; teeth alike in jaws, tri- 

 cuspid, interspace basally between each cusp usually with small 

 denticle ; nostril rather large, lateral, inferior on side of snout, inter- 

 narial space 4 in head ; interorbital 2%, broad, slightly convex. Gill 

 openings very large, first longest. 



Scales all form finely roughened skin, very small and each forms 

 flat triangular point with smooth surface. 



Dorsal length 1 in head; anal length 1; least depth of caudal 

 peduncle 41/2; pectoral liA, width ly^ its length; ventral length, to 

 hind edge of clasper, 1 in head; clasper conic, with deep groove, 

 deeply cleft basally, length 1% in head. 



Uniform drab-brown, fins slightly darker terminally. Iris slaty. 

 Teeth pale or whitish. 



Japan, New South Wales. 



U.S.N.M. No. 48530. Japan. Prof. M. Mitsukuri. Length, 1,200 mm. 



Order Asterospondyli 



Vertebral column well segmented, each segment forming a neural 

 arch and one centrum. Vertebrae each with internal calcareous la- 

 mellae radiating from central ring. Gill openings 5. Two dorsal 

 fins. Anal fin present. 



Includes the greater number of living sharks. 



ANALYSIS OF FAMILIES 



a\ Heterodontoidei. Each of 2 dorsals with fixed spine; snout short; mouth 

 narrow, lobed, folded ; no nictitating membrane ; teeth raptorial forward, 

 molarial backward; nasoral grooves present; spiracles present; caudal 

 short, axis raised Heterodontidae 



