436 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Trygon chindralcee (Cuvier) Bleeker, Verb. Batav. Genootsch. (Bengal), vol. 

 25, p. 9, 1853 (on Tenkee shindraki Russell). 



Trygon hetenirus Bleeker, Verb. Batav. Genootsch. (Plagiost.), vol. 24, p. 67, 

 1852 (type locality : Batavia) ; Nat. Tijds. Nederland. Indie, vol. 9, p. 395, 1855 

 (North Pasuruan, Java) ; vol. 20, pp. 238, 447, 1859^60 (Singapore). 



Trygon (Himantura) hcterurus Dumebil, Hist. Nat. Elasmobr., vol. 1, p. 591, 

 1865 (compiled). 



Trygon, polylcpis Bleeker, Verh. Batav. Genootsch. (Plagiost.), vol. 24, p. 73, 

 1852 (type locality: Batavia) ; Versl. Akad. Wet. Amsterdam, vol. 12, p. 30, 

 1861 (Singapore).— GtJNTHER, Cat. Fishes British Mus., vol. 8, p. 475, 1870 

 (Ceylon). — Klunzinger, Verh. zool.-bot. Ges. Wien, vol. 21, p. 680, 1871 

 (Red Sea). — Peters. Monatsb. Akad. Wiss. Berlin, p. 447, 1876 (Mauritius; 

 Seychelles).— Bartlett, Sarawak Gaz., vol. 26, No. 366, p. 134, 1896 (Buntal). 



Trygon (Himantura) polylepis Dumeril, Hist. Nat. Elasmobr., vol. 1, p. 590, 

 1865 (compiled). 



Trigon polylepls Sauvage, Hist. Nat. Madagascar, Poiss., p. 510, 1891. 



Trygon dadong Bleeker, Nat. Tijds. Nederland, Indie, vol. 10, p. (348) 355, 

 1856 (type locality: Rio, Bintang). 



Trygon (Himantura) dadong Dumeril, Hist. Nat. Elasmobr., vol. 1, p. 591, 

 1865 (Bintang). 



Leiobatus dadong Bleeker, Versl. Meded. Akad. Wet. Amsterdam, ser. 2, vol. 

 2, p. 290, 1868 (Rio, Bintang). 



Trtygon nuda GtJNTHER, Cat. Fishes British ISIus., vol. 8, p. 476, 1870 (type 

 locality: Singapore, India). 



Trygon nudus Martens, Preuss. Exped. Ost-Asien, vol. 1, p. 408, 1876 (Singa- 

 pore). 



Himantura nuda Jordan and Snyder, Annot. Zool. Japon., vol. 3, p. 42, 1901 

 ("Japan"). 



Dasyatis nudus Fowler, List Fish. Malaya, p. 16, 1938 (reference). 



Raja obtusa (Ehrenberg) Klunzinger, Verh. zool.-bot. Ges. Wien, vol. 21, p. 680, 

 1871 [type locality: Red Sea (name in synonymy)]. 



Snout produced, sharp angular point, slightly longer than preoral 

 or nearly double interorbital ; eye 3% in interorbital ; mouth width 

 3 in preoral length, little undulate; 2 oral papillae; teeth in about 

 32 rows in each jaw; interorbital 1% in snout, slightly depressed 

 medially. Spiracle large as eye. 



Interorbital, short space before eyes, cranium and middle of back 

 broadly covered with minute rough plates or tubercles; at disk 

 center small spine and slight enlarged vertebral row to tail where 

 about 9 down to caudal spines, posterior of which larger and 214 

 in snout. 



Tail without membranes: disk nearly wide as long, front edges 

 little concave, broadly rounded at angles and behind; claspers 

 moderate. 



Uniform brown above, whitish below. 



Red Sea, Mauritius, Seychelles, India, Ceylon, Malay Peninsula, 

 Pinang, Singapore, East Indies, Indo China, China. 



1 example. A.N.S.P. Bombay, India. Dr. F. Hallberg. Disk to hind ventral 

 ends, 238 mm., tail, 285 mm., disk width, 225 mm, 



