90 On the Fresh-water Shells of India. [Feb. 



The young are keeled like those of the last species. Length about 

 one inch — aperture with a bleak horny rim. Operc. corneous. 



No. 4. — Paludina. 



Found in a large jheel near Chunar. 



The spire very much corroded. Colour pale olive-green. Aperture 

 with a black horny rim. One of these produced 27, and another 87 young 

 ones; they have the ridge and the sub-triangular aperture when young. 

 Length from nine lines to an inch. Animal orange and black. Operc. 

 corneous. 



No. 5. — Paludina. 



Found in the Jegu nullah at Chunar. 



Shell solid and thick, pale green, interior white. Little more than 

 an inch in length. Operc. corneous. 



No. 6. — Paludina. 



Found in a very large jhil near Chunar. Colour dark olive-green, 

 and longitudinally striped with 10 black stripes, alternately narrow and 

 broad. Spire corroded ; margins of the mouth with a horny rim. This 

 shell is more globular than any I have seen, belonging to the Genus 

 Paludina. I have only two of them, and the animal is unknown to me. 

 Operc. corneous. 



No. 7. — Valvata ? 



This is the shell of which a description appeared in the 9th No. of 

 the Journal, under the head of Notes on the Habits of the Paludina. 



These shells differ much in the development of the umbilicus, some 

 having it well defined, others having scarcely any. Operc. calcareous. 



This I found at Mirzapoor, at the foot of trees, in puddles of water. 



No. 8. — Valvata? 



These I have seen in abundance on the banks of the Ganges and 

 nullahs, but always dead and injured from exposure to the sun. The 

 only living ones I have seen, I found at Dhuni in the Jypoor terri- 

 tory, under a wall enclosing one side of a dirty tank. The spire of 

 these is not corroded like the last species, nor has it any umbilicus ; aper- 

 ture angular above and below. Operc. calcareous. 



No. 9. — Valvata ? 



Found with No. 7, at Mirzapoor. 



The aperture only angular above. 



No umbilicus. Operculum calcareous. 



No. 10. — Planorbis, Corneus ? 



These may be found in almost every jheel or stagnant piece of water. 

 Like all the fresh-water univalves, they bury themselves in the mud, as 

 the water evaporates during the hot seasons of the year. I brought a 

 lump of dry clay from the bed of a jheel at Mirzapoor, to Neemuch, and 



