1863. | Contributions to Indian Malacology. 325 
convex sides, apex pointed, not acuminate, suture impressed. Whorls 
7, the antepenultimate being the largest, last whorl rising considerably 
upon the penultimate. Aperture vertical, nearly circular, the colu- 
mellar margin being straight, with an obtuse angle at the base, and 
furnished with a small tooth internally. Peristome double, orange 
in colour; both lips expanded, the inner forming a thin callus upon 
the penultimate whorl. Opere. thin, horny, white, circular, flat, with 
no distinct spiral structure. 
mm. in. 
aN es Sa aL DDI Wea ea ner eR 0.15 
JD TROT SUN E Ces yea CREO ea ees SSM ee sO 0.08 
ID Mena, Bhan ene seni 0.04 
Habitat.—Puppa Hill in ie Pe with Alyceus Vulcani. 
The largest species yet discovered in Burma and the most symme- 
trical, so far as I know, of all Asiatic forms. None of the Burmese 
representatives of Diplommatina shew the strongly acuminate spire, 
or the great swelling of the antepenultimate whorl which distin- 
guishes the species inhabiting the Himalaya. 
7. DIPLOMMATINA EXILIS, n. s. 
Shell dextral, not rimate, very slenderly subfusiform, rather solid, 
moderately, closely and obliquely ribbed throughout. Spire turreted 
with straight sides, apex obtuse, suture impressed. Whorls 73, 
rounded, antepenultimate slightly larger than the penultimate. 
Lower whorl rising a little near the aperture, which is subvertical, 
slightly inclined downwards, almost circular, the columellar margin 
being straightened, terminating in a right angle at the base, and 
bearing a moderate-sized internal tooth. Peristome double, the 
inner lip being prominent, slightly expanded, and continuous upon 
the penultimate whorl, but not forming a broad callus ; outer lip, 
slightly expanded, retro-relict. Opere. ? 
mm. in. 
PNNGE ONE Sakis stiauiadtilbs lc uolddabasuse Pek 0.12 
DDRII Gash Sousa. «els dalld vodlabei dull 0.05 
IDMENaT Sey O eae ae Se eeabt el On) 0.03 
Habitat.—_Mya Leit Deiaa tal 
The most slender species of the genus with which I am acquainted, 
and easily distinguished by this character from all others, by its 
long narrow form. 
