42 LAND AND FRESHWATER 
similarity between this species and the two above-named shells, the 
thread-like spiral midrib being so very distinctive of the subgenus 
1 now place it in. 
Srrata? cratuLator, W. BIf. (Plate X. figs. 1, 1 a, 15.) 
Nanina gratulator, J. A.S. B. 1865, p. 72 (section Trochomorpha) ; 
Pfr. Mon. Hel. vol. v. p. 94. 
Helix gratulator, Conch. Ind. p. 8, pl. xvi. fig. 2. 
Sitala gratulator, Theob. Suppl. Cat. p. 20 ; Nev. Hand-list, 1878, 
p. 33. 
Original description :—‘* Shell turbinate, perforated, thin, whitish 
horny. Spire conical; apex obtuse ; suture impressed. Whorls 5, 
slowly and regularly increasing, convex, spirally lirate and marked 
with oblique striz of growth above; the last whorl keeled at the 
periphery, convex and decussately marked with concentric and 
radiating striz below, not excavated round the perforation. Aper- 
ture diagonal, subtrapezoidal, breadth exceeding the height; peri- 
stome thin; margins distant, united by a callus, basal deeply 
sinuate; columellar vertical, forming a right angle with the basal, 
and briefly triangularly reflexed above ; reflexed portion thickened 
and passing half round the perforation. 
‘“‘ Major diam. 5-0 mm., minor diam. 4°5 mm., axis 4-0 mm. 
33 0-2 i 0-18 »5 0°16 inch. 
“ Aperture 3mm. broad, 2 high. 
“‘ Animal with a small mucous pore, and very small lobe above. 
‘¢ Hab, Irawaddy valley, Pegu. 
“This pretty little species abounds near Thayetmyo, and occurs 
throughout the Irawaddy valley in british Burmah. I do not re- 
member meeting with it in Arakan. It is easily distinguished from 
all others of similar form among Indian shells by its oblique mouth, 
by the peculiar columellar margin of the peristome, and by the 
strong lirate sculpture. I have much doubt as to whether it should 
be assigned to Trochomorpha, the species of which group are larger 
and the animals somewhat different.” 
This species does not occur, to my knowledge, anywhere on the 
Indian side in Assam. 
The subgenus Stfala can be divided into the following very di- 
stinct groups :— 
Character. Name. Locality. 
A. Shell small, pyramidal, closely 
umbilicated, keeled, more or less 
fist; jbelow,. with foun jar mt finful®  wlrcotiecs Lower Bengal. 
spiral ribs on the whorls ; colu- RbLe Gta». eitisscn Tenasserim. 
mellar margin simple, ROG OF | CULM! «idee Sdmven Pegu. 
Jess oblique; spire with flat sides; confinns 
: Ss Soils oseaptes + 
apex acuminate ......66 sseceeeeeeee Rarclge eee Andamans. 
GPOMATICA «6.62020 Munipur. 
phulongensis ...... North Kachar Hills. 
\ Genteincta 2.0000 Tenasserim. 
