1860.] The Cartilaginous Fislies of Loicer Bengal. 45 



ginattts, Te. imbbicattjs, Tu. walga, Tu. Bleekeei, Te. Ellioti, 

 Te. Kussellii, Te. ttabnak, and Te. yaeiegatus ; besides Hypo 



LOPHUS SEPHEN, AETOBATIS FLAGELLUM, RHINOBA.TUS GEANULATUS, 



Sphyenias Blochei, Peistis atítiquoeum and Pe. pectinatus, 

 and Sqtjalus Milbeeti (?), Sq. gangeticus, and Sq. Temminckii ; 

 — in all seventeen species of cartilaginous fislies. 



I add a brief notice of a young Teygon which I cannofc find to 

 be described, obtained on the Arakan coast, and now in the Medical 

 College Museum of Calcutta. 



Te. Cboziebi, nobis, n. s. Tail twice as long as tbe disk, com- 

 pressed, with a considerable membrane on more than half the lengtli 

 of its inferior surface, commencing below tbe insertion of the spine, 

 being nowhere however so bigh or deep as the tail itself. United 

 pectorals much prolonged into an acute peak anteriorly. Disk 

 smooth, with a mesial dorsal line of tubercles, beginning a little 

 behind the head, where a line of 11 (the last of them increasing in 

 size) have made their appearance above the surface ; the rest are 

 narrower and below the surface of the skin to the base of tail, where 

 a series of ten very stout prickles or decumbent spinelets — compressed 

 and pointing backwards and forming a range like the teeth of a saw, 

 — is continued nearly to the base of the caudal spine ; the latter 

 being much as in other Trygons, and having a backward-directed 

 serrature on each side for its terminal third. The colouring appears 

 to have been palé above, but no markings are discernible in the dry 

 specimen. Length of disk 11 in. and breadth the same ; tail 23 in. 

 This Teygoíí has the appearance of being the young of a very large 

 species. Anterior to the range of 11 developed caudal spinelets, tvvo 

 others can be distinguished of equally large size within the skin, and 

 anterior to these the series consists of much smaller and narrow 

 spinelets, untii again' the size is abruptly greater a little anterior to 

 the centre of the disk. 



Ápril 2nd, 1859. 



