YIVII'Alt.V. 0< 



Yav. tezpureusis (XeviU), Cat. Moll., Ease. E, p. 35. 



"A very interesting form, almost exactly intermediate between 

 P. crassa and P. siamensis. Spire mucli sliorter than in typical 

 form, and only a little more produced than in the 8iam species ; 

 whorls more globose; aperture less deflected, umbilicus less open, 

 sculpture more distinctly malleated. . . . ." 



Alt. 17*5, diam. lo-o mm. 



Aperture: alt. 9'5, diain. ll'o mm. 



Ilab. Tezpur. 



173. Vivipara siamensis (Frauenfdd) . 



Vivipara siamensis (Fraiienfeld), Verh. zool.-bot. Ges. AVien, iHGo, 

 p. 5:31, pi. 22 ; Nevill, J. A. S. B. xlvi, pt. 2, p. o2, & Dp. cit. 1, 

 p. 32. 



Shell solid, acuminately conic, flattened below, widely per- 

 forate, somewhat polished, very pale olive-green, margins of the 

 upper whorls almost whitish, the third and fourth convolutions 

 tinged with purplish-brown ; whorls 5, very convex, though 

 somewhat flattened in the sutural region, U)arked with faint 

 growth lines which show darkly here and there and sculptured 

 with weak, interrupted, spiral strias ; aperture large, broad ; 

 labrum thick, black; interior of shell white; operculum thin, 

 pale brownish, with very excentric nucleus. 



Alt. 24, diam. 21 mm. 



Aperture: alt. (including the labrum) 17"0, diaui. 14-5 uiiii. 



Hah. 8iam. 



Var. burmanica {Nevill), Hand List, pt. 2, p. 26. 



Original description : — A very small variety ; spire short, apex 

 obtuse, with the whorls even less acute and exserted, the last one 

 larger in proportion and more globosely swollen, with the keel 

 round the umbilicus obsolete ; aperture more contracted, that is, 

 less dilately expanded ; colouration of epidermis and the black 

 peristome exactly similar. 



Alt. 11, diam. 10 mm. 



Hah. Prome, on the Irawady (type) (TJieohahl) ; Tennsserim 

 Province (Liniboi-f/) ; Yaylaymaw, Upper Eurma {Anderson). 



174. Vivipara dissimilis {Midler). 



Vivipara dissimilis (^liiller), Verm. pt. 2, p. 184 (as Xerita.); 



Schrijter, Kiiil^it. Condi, ii, p. 253, pi. 4, fig. 10 {Nerifa). 

 Helia- dissimilis, Gmeliu, 8v6t. Nat. 3647 ; Dillwvn, Desc. Cat. 



p. 941 {Nerita). 

 Paludina remossii, Kiister (not Phi]ip])i), ed. Cbenin., Paludina, 



p. 26, pi. 5, figs. 17, 18 ; 11. & T., C. 1. pi. 77, tigs. 3, 4. 



Original description : — Testa pellucida glabra f uscescente-alba ; 

 albido maxime iu iufcriore anfractus parte conspicitur, quasi 



