1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 519 



DlPLOMMATlNA STJCCINEA, n. Sp. 



Loc. Anghami Naga Hills {Godwin- Austen). 



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

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

 with stronger coloration on the apex; spire somewhat depressed, 

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

 above the aperture ; aperture oval, vertical ; colum.ellar tooth only 

 indicated by a slight swelHng; peristome double, strong. 



Size : maj. diam. 1*3 ; alt. axis 2-0 millim. 



This minute species may be compared with D. parvula 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. 



DlPLOMMATlNA CONCINNA, U. Sp. 



Loc. Naga Hills, probably south of Margarita {Doherty, in coll. 

 T. H. Aldrich). 



Shell dextral, solid, fusiform ; sculfiture, 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'6 millim. 



This is very 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, 



DlPLOMMATlNA GIBBEROSA, n. Sp. 



Loc. South of the Barak River between Munipur and Imphal 

 {Godwin- Austen). 



Shell sinistral, ovately fusiform ; sculpture, very distant fine 

 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 4 i, 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 small, internal. 



Size : maj. diam. 1-.t ; alt. axis 2*2 millim. 



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

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

 particularly in the expanded penultimate whorl and in its very distant 

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

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

 country. 



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

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



