86 YIVIPAIMD.'E. 



171. Vivipara theobaldi, Kolelt. 



Vivipara theobaldi, Kobelt, in Martini & Chemnitz, Conch. -Cab. 

 1907, p. 151, pi. 30, tigs. 10, 11. 



Original description: Testa exumbilicata, ovato-conica, tennis. 

 Laud nitens, unicolor fusco-olivacea vel subnigrans, subtiliter 

 striatula, plerumque limo ferrugineo ad hae rente induta, apice 

 nigricante. Spira conica, apice acuto, sutura par urn impressa. 

 Anfractus 7, superi convex!, inferi supra planati et angulati, 

 carinis spiralibus plus minusve distinctis 3 cincti, ultimns acute 

 carinatus, carina versus aperturam distinctiore et eubtuberculata, 

 utrinque convexus, carinulis tribus superioribus, prima et secunda 

 magis approximatis, duabus inferis minoribus cinctns, antice 

 descendens, basi irregulariter costato-sulcatus, spirae altitudinem 

 superans. Aperttira parum obliqua, basi recedens, ovata, supra 

 acutiuscula, faucibus ccerulescentibus, vix fasciatis ; peristomn. 

 rallo angusta nigro-marginato continuum, margine exteruo vix 

 incrassato, extus ad carinam angulato, columellari calloso, distincte 

 duplici sed parum incrassato, aibo, nigro-marginato. 



Alt. 31-5, diam. 24 ram. 



Aperture : alt. 17, diam. 12 mm. 



JJab. Burma (Moellendorff Coll.}. 



172. Vivipara crassa (ffuttoii). 



Vivipara crassa (Button), MSS. in Benson, .T. A. S. B. v, 1836, 

 p. 745 (as Paludina) ; lieeve, Con. Icon., Paludina, sp. 33. 



Paludina obtnsa, Troschel, Wiep:n)ann's Arch. Nat. Hist. 1837, 

 p. 173 ; Philippi, N. Conch, i, p. 116, pi. 1. n>. 14 : Reeve, Con. 

 Icon., Paludina, fig. 33 ; H. & T., C. I. pi. 76, figs. 2, 3. 



Original description : Testa ovato-conoidea, ventricosa, solida, 

 pallide virente, obsolete fasciata, rugis exilissimis decussata ; 

 anfractibue tumidis, suturis excavatis ; spira obtusa ; umbilico 

 Bubcanaliculato ; apertura intus lactescente. 



Alt. 25 mm. 



Jfab. Bengal. 



" This species varies in configuration even in the same waters, 

 some specimens approaching to a subglobose form, while others 

 have a more lengthened conoid spire. It is very abundant in the 

 river Gumti at Jonpur, where it is paler, and has a more yellowish 

 tinge than the Silhet variety, which, from having an eroded 

 summit, appears 1o have inhabited stagnant water. It has a 

 singular habit, for the genus, of burying itself in the mud or 

 sand in shallow water, often in large societies ; other species 

 conceal themselves in the mud in the season of drought, but 

 ]\ crassa does so from choice, and is impelled by no such 

 necessity. The shell of the lately excluded young ie so depressed 

 and globular, that it might be easily mistaken for a young 

 Ampullaria. The adult shell attains a degree of thickness 

 unusual in the genus." 



