199 



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

 octona, in company with which it was found. 



Succinea semiserica. T. fragilis, ovalis, a tergo depressa, 

 postice straminea, antice albido-sericea, longitudinaliter plicoso- 

 striata : anfr. 2£, ultimo maximo ; apertura ovata, patula faciem in- 

 feriorem fere adequante. 



Long, l ; lat. T 8 T ; alt. -^ poll. Hab. Tavoy, in hortis. Rev. F. 

 Mason. 



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. T. ponderosa, elongato-conica, fusco-viridis, 

 decollata : anfr., numero integro ad 15, superstitibus 2-5, planulatis, 

 infra suturam constrictis, plicis profundis 4-nodosis longitudinalibus ; 

 ultimo subcarinato, basi striis crassis cincto : apertura subrhomboidalis, 

 antice producta, callo columellari rotundato, crasso, fauce plus minusve 

 fusca. 



Long. 3 poll. ; lat. 1 poll. Hab. Tavoy River. Rev. F. Mason. 



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. T. minuta, tenuis, ovato-oblongata, imper- 

 forata, pallide cornea, decollata : anfr. (superstitibus) 3, ventricosis, 

 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. Rev. F. 

 Mason. 



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

 rhomboidea, postice acuta, antice rotundata, ventricosa, margine 

 ventrali pendente, ubique lamellis concentricis obtusis reflexis con- 

 fertis ornata : natibus prominentibus ; cardine dentibus 21 utroque 

 latere instructs. 



Long. ^ ; lat. \ ; alt. ^ poll. Hab. 



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

 angular anteriorly. 



Bulimus turnix. T. oblongo-ovata, a tergo compressa, nitida, 

 cervina, flammuhs albidis quodamniodo seriatis marmorata, longitudi- 

 naliter striata, lineis granulosis volventibus decussata : anfr. 5 con- 

 vexis, ultimo magno: apertura ovali, peristomate valde revoluto, 

 rosaceo : columella obliqua, pliciformi : umbilico obliquo, rimato. 



