164 Records of the J ndiaii Muscain. [Vol. XV, 



Measurements of shells {in, ntiUhnefres). 



Specimen A is the type-specimen from Basra (?) : specimen B is 

 the adult shell from Nasariyeh. 



A. B. 



Length of hIu'II 



Breadth of shell ... 



Length of aperture (iacludiiig slit) 



Breadth of aperture 



Type-specimen. — No, 1139()/2M, Zoological Survey of India {Ind. 

 Mus). 



Localities. — Nevill gave the Ms. name here adopted to three shells 

 labelled " Basrah, Biluchistan " from the collection of the late 

 Dr. W. T. Blanford. The " Biluchistan " was probably a mistake. 

 Two of these shells are very young and one of them appears to be merely 

 a young shell of M. nodosa. The adult specimen I have made the type 

 of the species. In Colonel Lane's collection from the old lake-bed at 

 Nasariyeh I found two other shells, only one of them adult. They differ 

 from Dr. Blanford's adult specimen in having the longitudinal ridges 

 undivided and obsolete at the base on the body-whorl, but, considering 

 the variability habitual in the genus, must belong to the same species. 

 All four specimens were jjrobably subfossil. 



The s])ecies is closely related to M. lingitana, Morelet, which is pro- 

 bably confined to the western parts of the Mediterranean basin. It 

 differs in its more regular form, narrower body-whorl, more conical 

 spire and narrower aperture. It differs still more considerably in shape 

 and proportions from any form of M. costata, of which I have examined 

 a very large series of shells from Palestine, Spain, etc. From M. saulcyi, 

 Bourguignat, it differs in sculpture as well as in the shape of the body- 

 whorl. 



Family CERITHIIDAE. 



Potamides fluviatilis (Pott. & Mich.). 



1838. Ccrithuniii jlKuiatil is, I'otiez et Michaud, Gull. Moll., \). 303, pi. xxxi, figs. 



19, 2U. ■ 

 1910. Potamides (Ti/mpanolonos) fluviatilis, Annandale and Kemj), Mem. Ind. 



iMus. V, p. '344. 



Several worn and broken shells of this common estuarine species, 

 the range of which extends from the Persian Gulf to the seas of China, 

 Japan and Australia, are present in the collection from the sandy beds 

 in the lake deposit at Nasariyeh. So far as I am aware, P. fluviatilis, 

 though often abundant in water of low salinity, never lives in pure fresh 

 water. The specimens, therefore, must represent, with those of Corbula 

 and Balanus, a brackish-water element in this deposit. 



Order PULMONATA. 



Family LIMNAEIDAE. 



Genus Limnaea, Lamarck. 

 The material at my disposal does not make it possible to deal in at 

 all a satisfactory manner with the species or forms of this genus that 



