1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 519 



DiPLOMMATINA SUCCINEA, n. Sp. 



Loc. Anghami Naga Hills {Godwin- Austen). 



Shell dextral, tumidly fusiform, thin and delicate m texture ; 

 sculpture, regular, rather close costulation ; colour very pale amher, 

 with stronger coloration on the apex; spire somewhat depressed, 

 suture impressed ; whorls 6, tumid, with convex sides ; constriction 

 above the aperture ; aperture oval, vertical ; columellar tooth only 

 indicated by a slight swelHng; peristome double, strong. 



Size : maj. diam. I'S ; alt. axis 2*0 millim. 



This minute species may be compared with D. parmla from the 

 N. Khasi Hills, from which it differs in being larger, and in having 

 a greater number of whorls and a much more tumid shape. 



DiPLOMMATINA CONCINNA, U. sp. 



Loc. Naga Hll]s, probably south of Margarita (DoJierty, in coll. 

 T. H. Aldrich). 



Shell dextral, solid, fusiform ; sculpture, very strong, rather 

 distant costulation ; spire tapering rapidly, apex acuminate ; suture 

 impressed ; whorls 7, sides convex, penultimate and antepenultimate 

 about equal in size ; constriction hardly apparent, just above the 

 aperture; aperture circular, vertical; columellar tooth quite 

 minute, only an indication of it ; peristome double, strongly deve- 

 loped. 



Size: alt. axis I'd miUim. 



This is verv distinct from any of the minute species I have hitherto 

 examined from this part of India ; it is distinguished by its thick 

 shell and strong costulation. 



Sinistral species. 



DiPLOMMATINA GIBBEROSA, n. Sp. 



Loc. South of the Barak River between Munipur and Imphal 

 (Godwin-Austen). 



Shell sinistral, ovately fusiform; sculpture, very distant hue 

 costulation, 9 ribs on the antepenultimate whorl when viewed from 

 the front ; colour very pale greenish ; spire low, sides rounded, apex 

 blunt; suture very impressed; whorls 4i, very swollen, sides very 

 convex, penultimate much the largest ; constriction on penultimate 

 in centre above the aperture ; aperture oval, subvertical ; peristome 

 double, strong ; columellar tooth sm.all, internal. 



Size : maj. diam. I'.t ; alt. axis 2-2 millim. 



The nearest ally of this species is D.jaintiaca, G.-A., figured m 

 the J. A.S.B. vol. xxxviii. pi. iii.; it differs, however, much in form, 

 particularly in the expanded penultimate whorl and in its very distant 

 sculpture. A very large number of it were collected in the above- 

 named locaUty, and a single example at Prowi in the Lahupa Naga 



country. . , i xt 



In the collection sent me by Mr. Aldrich in a box marked JNaga 

 Hills were about 40 specimens of this shell. The exact locality 



