264 T.AXJ) AND FRESHWATER 



Shell depressed or conoidly depressed. 



With longitudinal striation. 



Macbochlamys ixdica, var. (Plate CXXXI. fig. 3 ; Plate 

 CXXXII. figs. 9-9 d.) 



Locality. Silchar, Cachar {F. Ede). No. 968 B.M. Coll. 



Shell depressedly conoid, narrowly perforate; sculpture coarse, 

 wavy, distant striation, like that of fig. 1, Plate XXI., 31. indica ; 

 colour rich umber-brown, or pale burnt-sienna ; spire low, sides flat, 

 apex flatly conoid ; suture shallow ; whorls 6, regularly increasing, 

 the last well rounded ; aperture semilunate, subvertical ; peristome 

 thin ; columellar margin oblique, not thickened, just reflected 

 close to the umbilicus. 



8ize .... Moj. diam. lS-0, min. 16-0; alt. axis 7*0 mm. 

 Largest.. ,, 213-0, „ 21-.5; ,, 9"5 „ 



This no doubt represents, in this part of the N.E. Frontier, 

 the Calcutta form of M. indica, only that here it grows to a much 

 larger size. For comparison, the one I have selected to figure is 

 of the same size, and it will be seen is somewhat flatter on the 

 spire, but the aperture is quite similar, and the sculpture at ouce 

 distinguishes the species. 



This species is found also at Bolagunj, Sylhet, where its form 

 is quite that of Calcutta shells, and of same size. These shells 

 were obtained by Mr. AVood-Mason, and Nevill had named them 

 piseudovitrinoides — a MS. name — which may have got into some 

 collections *. 



The generative organs also agree with, those I figured and 

 described in Vol. I. p. 98, Plate XVIIJ. figs. 2 and '6. 1 give 

 figures of them in order to verify former work. 



The radula showed a formula of : — 



20 . 1 . 10 . 1 . 10 , 1 . 20 

 or 31 . 1 . 31 



a reduction of the marginals only. 



Jaw with central projection. 



Animal. There is a narrow black band near the mantle-edge, 

 and the wall of the branchial cavity is bordered by a narrow black 

 band running back as far as the heart. Whether this is to be 

 seen in Calcutta specimens is a point to be observed. 



Very Jim microscopic strice. 



MACEOCHLAMys HARDWiCKEi, type — Moll. Ind. i. 1883, 

 pp. 105-107. 



Paun. Brit. Ind., Moll. (1908) p. 97. 



* It is, I know, not desirable to publish MS. names, but Nevill made 

 exchanges with both British and Foi'eign collectors, and many of these names 

 have become known to them. 



