PALUDINID^. 893 



Both diflFer from typical Bengal P. dissimilis (P. praemorsa, Bens.) by the con- 

 siderably more developed sculpture, more angular last whorl, less rounded aper- 

 ture, and less open umbilicus, and by the more uniform green coloration ; the white 

 belt is also less distinct than it is in most Bengal specimens ; it is even less like 

 the South Indian var. variata and var. ohtusa. 

 Common at Ava and Bhamo. 



var. vmiDis, Bv. 



Paludina viridis, Hani. Mss., Rv., Con. Icon., fig-. 20. 

 Paludina dissimilis ^ var. viridis, Nevill, l. c, p. 31. 



A fine striking form, easily distinguishable from the preceding by the more 

 produced spire, obsolete belt, &c., exactly resembling the above figure given by 

 Beeve, but a trifle smaller. A few specimens only were found at Kabyuet. 



Long. 29J, diam. 21 mm. 



Paludina siamensis, v. Pr., var. ? 



Fivipam siamensis, v. Fr., Zool.-Lot. Ges., Wien, 1865, pi. xxii. 

 Paludina siamensis, Nevill, I. c, p. 32. 



The Indian Museum possesses a single typical specimen from Siam, which 

 seems to present no distinctive characters, except in its greater size, from the 

 numerous, but all unfortunately young, specimens found alive at the second defile 

 of the Irawady and at Yaylaymaw. 



Paludina bengalensis, Lamk., var. doliahis, Gld. 



Paludina hengalensis, Lamk., var. digona, (vel. P. diagona) Blanf., Proc. Zool. Soc, 1869, p. 445. 

 Paludina doliaris, Gld., Proc. Nat. Hist., Bost. Soc, vol. i, p. 44. 

 Paludina bengalensis, var. doliaris, Nevill, l. c, p. 32. 



Countless varieties of this well-known sheU are to be found everywhere through- 

 out the Indian region. The form from Bhamo, called var. digona by Mr. Blanford, 

 the type of which is in the Indian Museum, is very incorrectly figured,^ the charac- 

 teristic angulation of the last whorl not being shown. It is apparently the widest 

 spread variety of all ; in the Indian Museum there are specimens almost undistin- 

 guishable from one another from Calcutta, Mandalay, and Siam. A small and less 

 angular form of var. digona was obtained at Myadoung, having the last whorl more 

 produced and separated. And another form from Cochin China, P. poly gramma. 

 Mart., apud Morelet, is also found in Pegu and Calcutta. An interesting form near 

 var. digona was found at Shuaygoomyo : it differs by the remarkably developed 



* Con. Indica, pi. 115, fig. 7. 



