FISHES OF THE I'HILIPPINE ISLANDS AND ADJACENT SEAS 433 



in head to hind spiracle edge. Interspiracle space ly^, spiracle length 

 little greater than orbit. 



Skin smooth. 



Tail long, whiplike, strong basally, tapering, without dermal 

 folds, spine inserted little before first fifth its length, 11/2 in head 

 to hind spiracle edge; pectorals form circular disk, width slightly less 

 than length, which 15(5 in tail. 



Uniform. Size not given, a young female. (Giinther.) 



Micronesia. Probably the young of the very variable Dasyatis 

 imhHeafvs, though thought by Giinther to differ in the presence of 

 4 papillae on the floor of the mouth. 



DASYATIS UYLENBURGI Giltay 



Dasyatis uylenhnrgi Giltay, Mem. Mas. Roy. Nat. Hist. Belg., ser. 5, vol. 3, p. 13, 

 fijjs. 3-6, 1933 (type locality ; Poeloe Endoe, Aru Islands). 



Disk width very slightly less than its length; snout 3% in disk 

 lengdi to hind pectoral end; eye 5% in snout, 3 in interorbital ; 

 mouth small, 2I/2 in preoral length; upper jaw curved and well un- 

 dulated, upper teeth 33, lower 27, small, white, subtriangular, 

 pointed; buccal papillae 3, two external ones much longer than 

 median ; interorbital 2 in snout ; spiracle little longer than eye. 



Scales of back form regular design from interorbital to base of 

 tail, cordiform; on median line of tail row of 5 spiniform, lanceolate 

 scutes. 



Tail short, II/2 times longer than disk, armed with barbed spine 

 above; upper and lower ridges little distinct, obsolete. 



Disk above uniformly brown, i)aler toward edges. Below white. 



Length of disk, 180 mm., disk width, 190 mm., tail, 280 mm. 

 (Giltay.) 



Aru Islands. Said to differ from Dasyatis imhHcatus in dentition, 

 the 3 buccal papillae inside the mouth, and the long continuous paved 

 area of scutes on the back. 



DASYATIS MARGINATUS (BIyth) 



Trygon marginatns Blyth, .Journ. Asiatic Soc. Bengal, vol. 29, p. 38, 1860 

 (type locality: Lower Bengal). — Day, Fishes of India, pt. 4, p. 738, 1878 

 (Blyth's example) ; Fauna British India, Fishes, vol. 1, p. 54, 1889. — An- 

 NANDALE, Mem. Indian Mus., vol. 2, p. 30, text fig. 5, pi. 3, fig. 11 (mouth), 

 1!>09 (off Burma and Ganjam, 24 fathoms). — Phi-VRSON, Ceylon Administr. 

 Rep. 1915-18, p. F16. 



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

 588, 1865 (Calcutta). 



Dasybatus nmrginatns Garman, Mem. Mus., Comp. Zool., vol. 36, p. 378, 1913 

 (Burma, Ganjam, India). 



Trygon atrocissimus Blytu, Journ. Asiatic Soc. Bengal, vol. 29, p. 39, 1860 

 (type locality: Probably Indian Ocean (tail with spine).) 



