322 Contributions to Indian Malacology. [No. 4, 
whorls being very rough and free, internally very slightly concave, 
with a minute central nucleus projecting. 
mm. inch 
Miajoridvamis, cciven ce. ceencete. sosece, Fell 0.55 
Minor tdi btoteerercssc settee: cores tee 0.5 
PANCIbUCe me mean emeaheor. meen cen rd 0.28 
Diameter of aperture, ...2......5.-.. 0 0.15 
Habitat. Mya Leit Doung, near Ava. 
This species, with C. calyx, Bens., from Molmain, and C. pinnulzifer, 
Bens. from the Khasi hills, forms an extremely well marked section 
of the genus Cyclophorus, having indeed quite as good claim to 
separation as some acknowledged genera, e. g. Leptopoma. All are 
distinguished from other discoid species by a scabrous epidermis, and 
an operculum with raised edges to the whorls externally, thus exactly 
resembling that of the Burmese forms of Pterocyclos and Spiraculum, 
to the former of which genera this little group forms a passage. If 
considered worthy of separation as a subgenus of Cyclophorus, 1 
would suggest for it the name Scabrina. 
The description of C. calyx by Mr. Benson in the Ann. and Mag, 
Nat. Hist. for 1856 (2nd series, Vol. XIX. p. 228) must have bee” 
taken from a dead specimen which had lost both its epidermis and 
operculum. In living specimens, brought to me by a collector whom 
I sent to Molmain, the shell was covered with a scabrous dark epi- 
dermis, radiately striated, and with raised spiral lines which, as in C- 
hispidulus, were more marked in young than in adult individuals. 
The operculum was slightly concave externally, in consequence of the 
edges of the whorls being raised and ragged, especially near the 
circumference ; internally it was smooth and nearly flat, with a small 
central nucleus. C. calyx is well distinguished from C. hispidulus and 
O. pinnulifer by its smaller whorls, the strong subangulation around 
the umbilicus, the ornamentation beneath the epidermis, and the 
markings of the epidermis itself, the raised ridges surrounding the 
shell being fewer and much more pronounced in C. hespidulus. 
In C. pinnulifer the mouth is larger, and the markings on the 
epidermis very oblique, instead of concentric, and somewhat irregu- 
lar. The operculum is very Pterocycloid with rough raised edges to 
the whorls. 
