Enolish conchologists appear not. to be aware of the vast 

 number of testaceous animals which are now known. Among 

 those truly eminent men who have prosecuted this study, 

 M. Adanson stands foremost, in having minutely described 

 all those he found on the African coast ; in the magnifi- 

 cent work of Poli nearly all the Mediterranean bivalves are 

 exquisitely figured ; and those of the land and fresh water will 

 receive complete illustration from M. Ferrusac. Cuvier, La- 

 marck, Say, and even our own countrymen, Dr. Leach and 

 Montague, have all contributed, more or less, to form a mass 

 of information which it is full time should be employed as the 

 basis of natural classification. 



PALUDINA elongata, 

 Long-spired River Snail — upper and lower figures. 



P. testa olivaceo-fwicd^fasciis casfaneis ornatd ; spini proditctd, attenu- 



atd, apertitrd miilto longiorc ; apice acuta. 

 Shell olive brown, with chesnut bands ; spire lengthened, attenuated, 



much longer than the aperture ; tip acute. 



Inhabits the rivers of India. It is rather thicker than most 

 of the others, and the umbilicus nearly obsolete. 



PALUDINA unicolor, 

 Olive River Snail — side figures. 



P. testa suhveiitricosd, totd ulivaced ; apice acuta ; spine tt apertunv 



longitudine cequali; umbilico clauso. 

 Shell subventricose ; uniform olive ; apex of the spire acute ; aperture 



and spire of equal length; umbilicus closed. 



Distinguished from the Helix vivipara of authors, by 

 having a less convex, and more pointed spire, hardly any 

 umbilicus, and no bands. Inhabits China. 



PALUDINA carinata, 

 Carinated River S)iail — middle figures. 



P. testa pand, alivaced ; spird aperturd langiore, apice obtuso, rufo ; an- 

 fraclu hasa/i media lev iter carinata ; umbilica absaleta. 



Shell small, olive ; spire longer than the aperture ; the tip obtuse, 

 rufous ; basal whorl slightly carinated in the middle ; umbi- 

 licus obsolete. 



A DISTINCT species, which is never found larger than the 

 figure. I once saw near 100, which had been picked up on 

 the banks of the Ganges ; the spire is rather lengthened, 

 always obtuse, and the umbilicus even less than the last. 



