1909.] 



N. Annandale : Report on the Batoidci. 



27 



A considerable number of specimens of T. bleekeri were taken by the ' ' Golden 

 Crown ' ' in October off the coast of Burma and Orissa. Most of the specimens I have 

 seen have been females, as is also the case as regards T. uarnak. The two species are 

 often taken together. Both seem to be commoner in the northern parts of the Bay than 

 off the Madras coast. This is especially the case as regards T. bleekeri, which, indeed, 

 has not been taken by the ' ' Golden Crown ' ' except in the north. Both species appar- 

 ently prefer a muddy bottom. 



Trygon alcockii, sp. nov. 



Size considerable (adult female 85 cm. across the disk). 



Disk slightly broader than long, with the pectoral angles rounded ; the length from 

 the maximum diameter to the tip of the snout contained about 2j times in the 

 length of the disk. The snout pointed, forming approximately a right angle, 

 by no means strongly produced but considerably longer than the interorbital dis- 

 tance ; its length contained nearly 4I times in the length of the disk. 



Fig. 3. — Outline of Trygon alcockii, x c. ,-„. 



Tail nearly cylindrical but somewhat flattened above at the base, tapering, not twice 

 as long as the disk, without cutaneous folds, bearing a single large spine. 



Co/oMr.— Dorsal surface dark olive-brown with small, obscure, pale spots scattered 

 all over the disk and the base of the tail ; the edges of the fins purplish ; the 

 dorsal and lateral surfaces of the tail brown, without markings except at the 

 base. Ventral surface (including base of tail) white, suftused with pink ; a rather 

 broad purphsh lateral margin marbled with white. 



