714 SURGEON F. DAY ON THE [Dec. 5, 



is placed transversely across the body of the anterior vertebrae. It 

 has an expanded globular portion on either side enclosed in a bony 

 capsule, and with a transverse connecting tube. 



Geographical distribution. — Central India, Jumna, and Ganges, 

 and through Burmah to the Malay archipelago. 



Genus Bagarius, Cuv. et Val. 



Air-vessel small, consisting of two round portions situated on either 

 side of the body of the anterior vertebrae and partially enclosed in 

 bone. (For a detailed description, see Taylor in ' Gleanings in 

 Science,' 1830.) 



Geographical distribution. — Throughout the large rivers of India. 



Genus Pseudecheneis, Blyth. 



Air-vessel in two rounded lateral portions, each of which is en- 

 closed in a bony capsule. 



Geographical distribution. — The Subhimalayas below Darjeeling, 

 and on the opposite side of the Brahmaputra, on or near the Khasya 

 hills. 



Genus Glyptosternum, M'Clelland. 



Air-vessel in two rounded lateral portions and enclosed in bony 

 capsules. 



Glyptosternum striatum, M'Clelland. 



I have obtained this species with from nine to eleven anal rays, 

 and I suspect G. reticulatus and G. pectinopterum, M'Clell., to be 

 synonyms. It is found in the rivers of the lower plateau of the 

 Himalayas, down to those of the plains ; and a most remarkable dif- 

 ference is perceptible in specimens from these two situations. Only 

 small ones are taken on the hills ; and these have the pectoral and 

 ventral rays plaited inferiority, more especially in the young, evidently 

 to enable them to adhere to the rocks, and by these means, with the 

 assistance of the adhesive sucker on the chest, to withstand the im- 

 petuosity of the mountain-torrents. I took larger ones in the Beas 

 near the plains ; and in them this plaiting was either very indistinct 

 or entirely absent, whilst there cannot be a doubt as to the identity 

 of the species. 



Glyptosternum dekkanense, Giinther. 



I found this species tolerably abundant in the Jumna, near where 

 it emerges from the Sewalik hills. 



Glyptosternum modestum, sp. nov. 



D. i|0. V.\. V. 6. A.f. C. 15. 



Length of head £, of caudal T 2 T , height of body >% of the total 

 length. 



Eyes small, superior, situated in the middle of the length of the 

 head. 



