14 LAND AND FRESHWATER 



spire rather depressed, sides convex, apex blunt ; suture well im- 

 pressed ; whorls 0, sides convex, swollen, antepenultimate the 

 largest ; constriction above the aperture ; aperture ovate, vertical ; 

 columellar tooth well marked; peristome as usual. 



" Size : alt. axis 1-75 mm. 



"There are only two specimens in the collection among those, 

 merely labelled Naga Hills, but I have every reason to think they 

 were from near Margarita." 



Small species, with very minute or no columellar process or tooth. 



Some conchologists might consider these worthy of subgeneric 

 distinction, and the Diploiumatlninre have been already much split 

 up. It is perhaps undesirable after all to increase the number of 

 subgenera on small differences of shell-development, for it becomes 

 at last so very difficult to locate the intermediate forms. 



DiPLOMMATiNA MUNiPURENSis, Godwiu-Austen. (Plate LXVI. 

 fig. 6.) 



Diplommatina munipurensis, G.-A. P. Z. S. 1802, p. 518. 



Locality/. South of the Barak River, between the Mao villages 

 and Munipur (Goihvin-Austeu). 



Original description : — " Shell dextral, elongately fusiform ; 

 sculpture minute, close costulation ; colour very pale greenish grey ; 

 spire symmetrical, sides slightly convex ; suture well impressed ; 

 whorls (U, sides convex; constriction in front and immediately 

 above the aperture ; no columellar tooth, its position indicated by 

 a slight sinuosity on the columellar margin ; aperture nearly cir- 

 cular, subvertical ; peristome closely double, very slight in form, 

 the inner does not spread much upward on the penultimate whorl. 



" Size : maj. diam. 1*5 ; alt. axis 27 mm. 



" From the number of specimens found, this appears a very 

 abundant species ; I never got anything like it in the Khasi Hills 

 to the west." 



Diplommatina venustula, Godwin-Austen. (Plate LXVI. 

 figs. 7, 7 a.) 



Diplommatina venustula, G.-A. P. Z. S. 1802, p. 518. 



Localit)/. Japvo Peak, Anghnmi Xaga Hills (Godivin-Austen). 



Origincd description : — " Shell dextral, elongately fusiform, thin ; 

 sculpture, fine, regular, close costulation throughout ; colour pale 

 amber ; spire high, sides flatfish, apex acuminate : suture impressed ; 

 whorls 7g, sides convex, the penultimate the largest; constriction 

 in front above the aperture ; aperture widely ovate, suhoblique ; 

 peristome but slightly developed, narrowly double, expanded into a 

 small wing on the upper and outer margin, giving it a very sinuated 

 margin ; no columellar tooth. 



" Size : maj. diam. 21 ; alt. axis 4*0 mm. 



" This species, of which I only obtained three specimens, is quite 

 distinct, as shown in the form of the spire and particularly the 

 expanded side of the peristome, which is an unusual character." 



