100 



Long, ^jj ; lat. -^^ poll. Hab. Tavoy, in hortis. 



The general aspect of the shell is not unlike that of Achatina 

 octona, in company with which it was found. 



SucciNEA SEMisERicA. Testa fragilis, ovalis, a tergo depressa, 

 postice straminea, antice albido-sericea, longitudinaliter plicoso- 

 striata : anfr. 2^, ultimo maximo ; apertura ovata, patula faciem 

 inferiorem fere adequante. 



Long. ^ ; lat. -^^ ; alt. -2% poll. Hab. Tavoy, in hortis. 



Its shape is like S. tigrina, Fer., and it is well characterized by 

 the peculiar silky-white or pearly surface of the anterior half of 

 the shell. 



Melania Herculea. Testa ponderosa, elongato-conica, fusco- 

 viridis, decoUata : anfr., numero integro ad 15, superstitibus 2-5, 

 planulatis, infra suturam constrictis, plicis profundis 4-nodosis 

 longitudinal ibus ; ultimo subcarinato, basi striis crassis cincto : 

 apertura subrhomboidali, antice producta, callo columellari rotun- 

 dato, crasso, fauce plus minusve fusco. 



Long. 3 poll. ; lat. 1 poll. Hab. Tavoy River. 



This is the largest Melania with which I am acquainted, and is 

 very massive. It differs from the large Melania found about 

 Calcutta (of which, also, I am unable to find any description,) by 

 its larger size, darker color, more numerous folds, which bear 

 about four tubercles each, instead of having usually only a median 

 carina bearing acute tubercles. 



Amnicola cincta. Testa minuta, tenuis, ovato-oblongata, im- 

 perforata, pallide cornea, decollata : anfr. (superstitibus) 3, ven- 

 tricosis, ultimo magno, subcarinato, lineis volventibus, et interdum 

 fascia fusca, cincto : apertura ovata, basi admodum producta, 

 labro simplici. 



Long, baud j^^ poll. Hab. fluv. Tenasserim, Burmah. 



Nucula turgida. Testa alba (dealbata,) sub-equilateralis, sub- 

 rhomboidea, postice acuta, antice rotundata, ventricosa, margine 

 ventrali pendente, ubique lamellis concentricis oblusis reflexis 

 confertis ornata : natibus prominentibus ; cardine dentibus 21 

 utroque latere instructa. 



Long. 4 ; lat. -^ ; alt. 3/^ poll. Hab. 



This must resemble closely N. tiunida, Reeve, but is in no 

 wise angular anteriorly. 



