98 JOURNAL, BOMB A Y NA TURAL HISTORY SOCIETY, Vol. XV 111. 



LlMNiEID^E. 



The animals of this family have all very thin horn-coloured shells. They 

 lower themselves from aquatic plants by a mucous thread and ascend in the 

 same way. They can often be seen gliding beneath the surface of the water 

 shell downwards, and in cold weather and drought hyberuate. 



Limncea amygdalus (Tras). 



Shell. — Spiral. Whorls 4, mouth very large. Lip acute. Spire small. 



Colour. — Yellowish. Extreme tip pink. Length 28. The only specimens of 

 this shell I possess are from Bombay. 



L. rufescens (Gray). 



Shell.— Slightly more slender than the last. Whorls 4 — 5. Lip acute. Spire 



small. 



Colour.— Yellowish with a pinky tinge. 



Length. — 30. 



According to Mr. E. A. Smith this is only a variety of L. acuminata (Lam). 



L. acuminata (Lam). 

 Differs only from the last in having a blunter spire. 



L. pinguis (Dohrn). 

 Shell. — As in the two last. Mouth smaller. Whole shell having a tendency 

 to curve to the right. Whorls 5. 

 Colour. — A clear amber. 

 Length. — 21. I have specimens of this from Madras. 



L. bulla (Bens). 

 Shell —Having a more rounded and stumpy appearance than any of the 

 above mentioned. Mouth fairly wide. Whorls 5 — 6. 

 Colour. — Yellow. 

 Length. — 23*5. 



Planorbis indicus (Bens). 

 Shell. — Many whorled. Mouth crescentic. 

 Colour. — Bluish grey. Inner lip white. 



Length. — 13. 



P. exustus (Desh). 



Shell. — As in last. Upper surface ribbed. 

 Colour.— Yellowish white. Inside mouth white. 

 Length. — 18. Pretty well distributed throughout India. 



Planorbis compressus (Hutton). 

 *hell.— Small, very compressed, many whorled. Mouth oval. 

 Colour.— Yellowish white tinged in parts with grey. 



Length. — 8. Commonly distributed. Planorbis may be found frequently 

 adhering to the under surface of water-lily leaves. 



* It is doubtful if L. acuminata and amygdalus can bo regarded ad distinct species but 

 rather as varieties of L. rufeioens. In giving them full specific rank I am following the 

 nomenclature adopted by Messrs. Sowerby and Fulton. . 



