1919. | N. ANNANDALE & B. PrAsHap: Mollusca. 29, 
The shell of this species bears a close resemblance, perhaps 
superficial, to that of the Syrian ‘‘Paludina ’’ badiella as figured 
by Ktister,! but the mouth is broader, the umbilicus narrower, 
the whorls less flattened above and pigment entirely absent. There 
has been much confusion about this Syrian species and we have 
no means of estimating the true relationship, if any exists, be- 
tween it and our Seistan mollusc. There is also a resemblance 
to Pseudamnicola macrostoma from Greece, specimens of which we 
have examined ; but the operculum of that species is much thinner, 
of different structure and of small size as compared with the mouth 
of the shell, which is much smaller than that of the Persian species. 
? Amnicola parvula (Hutton). 
1850. eG oon parvula, Hutton, Fourn. As. Soc. Bengal (2) XVIII, 
5 LOSS) 
1876. ee, parvula, Hanley and Theobald, Conch. Ind., p. XVII, 
pl. cli, figs. 8, 9. 
We have not seen this species and have no means of ascertain- 
ing its true generic and subgeneric position. Hutton says that the 
operculum is horny, and it would appear, therefore, to belong pos- 
sibly to Amnicola, s.s. The other known species of this subgenus 
are, however, American. Nevill’s* Bithynia orcula var. parvula is 
quite distinct and probably a true variety of Amnicola (Alocinma) 
orcula (| Frauenfeld). 
Hutton’s species was found in a marshy patch of ground in 
the Kojak Pass at Chaman (Chammun), now on the Afghan fron- 
tier of Northern Baluchistan. | 
) 
Family VIVIPARIDAE. 
Genus Vivipara, Montfort. 
Vivipara hilmendensis, Kobelt. 
190g. Vivipara (dissimilis var.?) hilmendensis, Kobelt, Paludina in 
Martini and Chemnitz’s Conch-Cab. (ed. Ktister and Kobelt), 
p- 289, pl. lix, figs. g-12. 
The complete synonymy of the forms included by Kobelt 
under the name Vivipara dissimilis has not yet been worked out, 
and we leave the Helmand form provisionally as a distinct species. 
We have very little to add to Kobelt’s description except that 
the natural colour of the shell is dark olivaceous with curious round 
whitish spots, and that the opercula of the specimens he examined 
were unnaturally thin owing perhaps to sand erosion. 
The species was described from the Afghan desert and is 
1 Kuster, “ Paludina, Hydrocena and Valvata in Martini and Chemnitz's 
Conch. Cab. (ed. Schubert and Wagner), p. 62, pl. xi, figs. 25-28 (1852). 
2 Nevill, Hand List Moll. Ind. Mus. U1, p. 37 (1885). 
