1892.] SPECIES AND VARIETIES OF DIPLOMMATINA. 517 



the largest ; constriction in centre, above the aperture ; aperture 

 widely ovate, vertical, angulate on the lower margin of the columella ; 

 the tooth large and well developed ; peristome very strong. 



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



This is another minute shell, differing from all others I have seen 

 in the strong peristome and large columellar tooth. D. delicata is 

 its nearest ally. 



DiPLOMMATINA SUBRUBELLA, n. Sp. 



Loc. Japvo Peak {Godwin- Austen). 



Shell dextral, small, fusiform ; sculpture, fine, regular, rather close 

 costulation ; colour pale reddish ; spire high, sides convex, apex 

 blunt ; suture impressed ; whorls 6|, sides convex, penultimate and 

 antepenultimate equal ; constriction in front, above the peristome ; 

 aperture circular, nearly vertical ; columellar tooth very small and 

 internal ; peristome closely double, not thickened. 



Size : maj. diam. 1"4 ; alt. axis 2'6 millim. 



This is a close ally of B. sherfaiensis, but is much smaller and 

 has a coarser sculpture. 



DiPLOMMATINA SUBTILIS, n. Sp. 



Loc. Margarita (W. Doherty, in coll. T. H. Aldrich). 



Shell dextral, elongately ovate, thickened ; sculpture, fine, close, 

 regular costulation throughout ; colour pale sienna-brown ; spire 

 with convex sides, apex blunt ; suture impressed ; whorls 6, sides 

 convex, penultimate slightly the largest, the last does not rise 

 much upon the penultimate ;, constriction in front, but not well 

 marked ; aperture circular, suboblique ; columellar tooth well 

 developed for the size of the shell ; peristome double, strong. 



Size: maj. diam. I'O; alt. axis 1*5 milliin. 



This is a good species, one of the smallest ; its elongated form 

 separates it at once from D.parvula, the finer costulation and larger 

 size from B. minuta. 



DiPLOMMATINA DELICATA, U. Sp. 



Loc. E. Naga Hills? {W. Doherty, in coll. T. H. Aldrich). 



Shell dextral, very small, tumidly fusiform ; sculpture, very distant, 

 strong costulation ; colour pale horny ; spire rather depressed, sides 

 convex, apex blunt ; suture well impressed ; whorls 6, 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 millim. 



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. 



