
1865.] Contributions to Indian Malacology. 81 
But a solitary specimen was met with belonging to this form, which 
is more tumid in the centre than any of its allies, C. insignis, Gould, 
&e. The non-continuity of the peristome may be due to immaturity 
in the specimen found. The shape of the mouth may also possibly be 
slightly modified in older examples, but the general form doubtless 
remains the same, and is alone sufficient to distinguish the species. 
A solitary specimen of another new form, much smaller than the 
above, being only 17 millem. long, occurred at Moditoung Tekan, on 
the road from Prome to Tongoop. It is unfortunately bleached and 
worn, though perfect. 
Genus STREPTAXIS. 
23. S. Burmantca, n. sp. 
Shell ovately subglobose, umbilicated, thin, horny, white, marked 
throughout with fine and closely set sinuate costulation. Spire 
convex; sutures scarcely impressed. Whorls 6, the last 2 widely 
excentric, rounded at the periphery ; the penultimate broader than the 
last whorl; last flattened beneath, and angulately compressed around 
the umbilicus. Aperture oblique, irregularly semioval, with a single 
re-entering lamellar parietal ; peristome white, thin, expanded through- 
out, deeply sinuate above, at the junction with the penultimate whorl, 
compressed and curved forwards on the upper right margin, and some- 
times furnished with a very small internal tooth-like callous projection ; 
the two margins subparallel, distant, united by a thin callus. 
Millem. inch, 
Major diameter,...... eared Re 10 0.4 
etaY ity WAGs ores Peed 7 0.28 
MMU IEEL Sextus 1 cpibie ak SuldeealeseeNes 6 0.24 
Habitat—Tongoop, Arakan. 
This is a very near ally of the Molmein S. Petiti, Gould, but it is 
distinguished from that shell and from S. exacuta, Gould, by the 
rounded periphery and more globose form. It is larger and less 
slender than S. Andamanica, Bens., and is distinguished from all the 
above species, and also from the Nilgiri S. Perrotteti, by the greater 
size of the penultimate whorl in comparison with that of the antepenul- 
timate, a character to which my attention was called by Mr. Benson. 
_ In Dr. Gould’s original description (an imperfect one) of S. Petiti, 
