626 Journal of the Asiatic Society of Bengal. [September, 1911. 
and were more widely known, the British Museum, etc., 
having been supplied with copies, the unfinished and 
unnamed drawing No. 65 was taken by Francis Day to repre- 
sent Raia fluviatilis, which was therefore thought to be 
identical with Trygon sephen of the British Museum Catalogue 
(Proc. As. Soc. Beng. 1871, p. 203), though many years before 
Edward Blyth correctly identified Raia sancur, H.B., as Trygon 
sephen (Forskal) (Proc. As. Soc. Beng. of 1860, p. 37). The 
principal mistake made by Buchanan. in the description of 
is Raia sancur was his statement that it lacked a ‘‘ prickle 
on the tail.’’ The spine is, however, conspicuously figured in 
drawing No. 65, and the omission must have been due to an 
insufficiency of notes. His statement that he had not seen 
Rf. sancur above where the tide reaches might have been due 
to inadvertence. This last statement, however, further misled 
Francis Day in causing him to conclude that none of the Batoidei 
were really freshwater species. He thought that all the cartila- 
ginous fishes were marine, but that some went up the rivers 
in quest of prey and thus were caught in fresh water. In his 
“ Freshwater Fish and Fisheries of India and Burma’’ (1873), 
p. 24, para. xlii, he says: ‘‘ In the sub-class Chondropterygit, 
order Plageostomata,. there are some species which ascen 
rivers for predaceous purposes.’’ On the same page, a few lines 
later, he adds, ‘‘ neither breed in the rivers.’’ In the appendix 
existence of Raia fluviatilis, H.B., by including its name, with a 
note of interrogation prefixed, in the synonymy of Trygon 
. This is a small fish and cannot be Raia fluviatilis, 
! This ‘* Trygon narnak’? is in all probability Tygon gerrardi, which 
has been often confounded by Day with 7. Uarnak. (See Annandale, 
Mem. Ind. Mus., V 
‘oticed i uaries and is captured in the rivers of Orissa within 
ean influence, but this fact has no bearing on the question of Hamilton's 
ater rays. 
ee Trygon walga has been sunk by Annandale as a synonym of Trygon 
tmbricata. (Mem. Ind. Mus., Vol. iI, No, I, p. 32.) 
