600 



Journal of the Asiatic Society of Bengal. [Sept., 1910. 



In Tr. oxycephalies, Tr. strigili-^ 

 fer, Tr. blochi, andTr. biacu- 

 leatus — the first dorsal spine j 



In the 

 first 



new species 

 dorsal 



the 



spine is 



is longer than the head ; and f shorter than the length 



in Tr. indicus the first dorsal \ 

 spine is as long as the head. J 



of head. 



In Tr. biaculeatus — distance 



from posterior margin of eye ( 

 ' to base of first dorsal spine, \- 



i 



length. 



as 



j 



In Tr. brevirostris — length of 



1 



post-orbital part of head [ 



equal to or greater than eye 

 diameter. 



I 

 J 



1 



In Tr. strigilifer, Tr. blochi and 

 Tr. oxycephalic — the mem- 



brane of 



dorsal is 



spinous 

 immaculate ; in Tr. biacu- 



leatus, the membrane be- 

 tween first two rays of spin- 

 dorsal 



ous dorsal is blackish ; 

 Tr. brevirostris. 



y 



in 



Tr. indicus 

 and in Tr. nueihofi, the en- 

 tire membrane of spinous 

 dorsal blackish. 



i 



In the new species — dis- 

 tance from upper pos- 

 terior margin of eye 

 to base of first dorsal 

 spine is equal to eye 

 length. 



In the new species — 

 length of post-orbital 

 part of head is con- 

 tained 2| times in the 

 eye length. 



In the new species— the 

 portion of the mem- 

 brane of spinous dor- 

 sal which is within the 

 rays of the spinous 

 dorsal and lower half 

 of the first dorsal spine 

 is immaculate but the 

 portion which is above 

 the level of the second 

 dorsal ray and only 

 attached to the upper 

 half of the first dorsal 



J 



spine is 



coloured in- 



tensely black. 



There were altogether 11 specimens collected from the Bay 



One from 



6 



of Bengal by the steam trawler " Golden Crown." 

 the mouth of the River Hugh, 4 in the Arakan coast, and 

 off Gopalpur in the Madras coast during 1908-9. Ten of these 

 have been used as types for this description and they are in 

 the collection of the Indian Museum. Their total length in- 

 cluding the caudal fin and their numbers in the register of tb 

 Museum are given below: F. W--* = 15 CM., F. *V* = 14"6 



♦ 80 



1 



M 



"P 8 5 7 



J. . y— 



14-3 CM., F. 



3 5 11 



CM.,F. * '^ = 13-2 CM. 



139 CM., F. 



13-8 



and F. ± °, 



10-2 CM. 



"P 1 *J» 7 - 9 



a. . , 



13-2 CM., F. *4f l =12'5 



The remaining specimen was submitted to Professor Max 

 Weber for examination, and we are very much indebted to him 



