454 BULLETIN 10 0, UNITED STATES NATIOIsTAL MUSEUM 



Dasyatis micrura var. japonicns Gbay, List fish British Museum, p. 122, 1851 



(Japan, China). 

 Pteroplatea hirundo (not Lowe) Ishikawa and Matsuuba, Prelim. Cat. Fishes 



Mus. Toljyo, p. 60, 1897.— Lm, Sci. Rep. Nat. Tsing Hua Univ., ser. B, 



,TOl. 1, pi. 5, fig. 6 (teeth), 1932 (Tsingtao). 



Depth 12 to 123/4 to end of tail ; head 4 to 41^, disk length 1% to 

 1% in width; tail length to base 2i/io to 2% in disk length. Snout 

 1% to 1% in head forms very slight angle to obtusely conic front 

 profile of disk ; eye 6 to 8 in head, 4 to 5 in snout, 5 to 5% in inter- 

 orbital; mouth width 1% to 2 in head; teeth in 30 to 40 rows in 

 jaws, each with shari), triangular denticle; nostril broad, oblique, 

 internarial width ll^ to 1% in mouth width; front nasal valve 

 broad, low lobe, hind valve short fold extending half way to in- 

 ternarial; interorbital II/2 to 1% in head, broad, level, with broad 

 median fontanel forming concave depression. Gill openings small, 

 equidistant, last shortest. Spiracles large, broad, transverse; eye 

 1^ to 1% in spiracle. 



Skin smooth. Small caudal spine long as spiracle, or shorter. 



No dorsal or anal ; tail slender, conic, tapers to firm, slender point ; 

 pectoral wide lobe, front edge little undulate, hind edge little con- 

 vex, apex obtuse; ventral small, broad, 2i/^ to 2^/4 in head; claspers 

 short, depressed, firm points, reach hind ventral edge. 



Above uniform umber. Tail whitish, with 6 black blotches above, 

 wider than pale interspaces. Under surface of disk whitish. 



China, Japan, Korea. 



U.S.N.M. No. 75878. Japan ? P. L. Jouy. Length, 223-260 mm. 2 examples. 



U.SN.M. No. 75879. Japan ? P. L. Jouy. Length, 200 mm. 



U.S.N.M. No. 71902. Tokyo market. Alhatross collection 1906. Length, 220 mm. 



GYMNURA BIMACULATA (Norman) 



Pteroplatea timaculata Norman, Ann. Mag. Nat. Hist., ser. 9, vol. 16, p. 270, 



1925 (type locality: Yenting, Chekiang Province, China). — Fowler, Proc. 



4th (1929) Pacific Sci. Congr., Java, p. 506, 1930 (copied) ; Hong Kong 



Nat. vol. 1, p. 182, 1930 (compiled). 

 Pteroplatea micrura (not Schneider) Richardson, Ichth. China Japan, p. 197, 



1846 (China Seas). 

 Pteroplatea jordani Chxt, China Journ., Shanghai, vol. 12, No. 6, p. 357, pi. 



1930 (type locality: Ning-po fish market; East Sea, China). 



According to Norman closely related tio Pteroplatea japonica 

 Schlegel, but with the anterior margins of the disk less undulated 

 and the tail a little shorter; pair of large, ovate, bluish white spots 

 separated by distance equal twice interorbital width, their anterior 

 edges level with the hinder margins of the spiracles. Greatest width, 

 365 mm., length from snout tip to vent, 170 mm., from vent to tail 

 end, 87 mm. 



