412 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



eye small, 9% in head, 714 ^^ snout, 5 in interorbital ; mouth small, 

 jaw distinctly but not strongly undulated; teeth white, w^ith single 

 distinct transverse ridge, larger on upper jaw at sides than in middle, 

 not occupying whole exposed surface of either jaw ; interorbital 2 in 

 head to hind spiracle edge. Spiracles little larger than eye and 

 farther apart or interspace 1%. 



Skin tough. Scales flat, more or less rounded; largest in small 

 patch behind shoulder girdle; between eyes and on middle of hind 

 part of back and base of tail larger than those on central part of 

 disk, where small and deeply sunk in skin to almost invisible; tail 

 completely covered with flat scales except ventral surface of part 

 anterior to spine, this surface, pectoral and pelvic fins bare. 



Tail nearly cylindrical but somewhat flattened above base, tapering, 

 without cutaneous folds, with single spine equal to space across inter- 

 spiracle ; pectorals form quadrangular disk, its length 1% in tail, 1% 

 in its width, outer angles rounded. 



Above dark olive-brown, with small, obscure, pale spots scattered 

 all over disk and base of tail. Fin edges purplish above. Dorsal 

 and lateral surfaces of tail brown, without markings except at base. 

 Ventral surface, including base of tail, white suffused with pink. 

 Rather broad purplish lateral margin marbled with white. Length, 

 about 1,983 mm. (Annandale.) 



DASYATIS FAVUS (Annandale) 



Trygon favus Annandale, Mem. Indian Mus., vol. 2, p. 25, pi. 1, fig. 3, pi. 3, 



fig. 10 (mouth), 1909 (type locality: Off Orissa). 

 Dasi/batiis favvs Garman, Mem. Mus. Comp. Zool., vol. 36, p. 377, 1913 (copied). 



Head to hind spiracle edge 7I/2 in total length. Snout ly^ in head 

 to hind spiracle edge, rather produced; eyes small, widely separated; 

 mouth large; teeth white, transverse ridge feeble even on unworn 

 teeth ; on mouth floor 2 bluntly triangular processes with irregularly 

 serrated margins and joined together by similarly serrated ridge. 

 Spiracle large, 5% in head. 



Skin without denticles with stellate bases. 



Tail slender, tapering (spine apparently removed in photograph, 

 its insertion about first thirteenth in tail length) ; pectorals form very 

 flat disk, broadly rounded, length 1% in tail. 



Dorsal surface of disk very dark brown with bold reticulation of 

 dull yellow, becomes less regular on fore part of disk; yellow spot 

 or streak in middle of most of meshes of reticulations. Ventral sur- 

 face white. Length, 1,300 mm. across disk. (Annandale.) 



India. According to Garman "apparently a variety of D. uamak.''' 



