t^^l

BITlIi'NIA. 73
3|, the last obliquely produced ; always imperforate, both in very
young and very old shells ; margins of aperture entire, broadly
reflected, produced aud angled at base, outer margin rounded ;
epidermis dark olive-green; under the lens a minute spiral
sculpture can be detected. Young specimens invariably show
a sort of varix, formed probably at ai~period when their growth
is arrfested by some cause, this varix becoming absorbed in adult
specimens.
Alt. 8'7o, diam maj. 6 ; alt. anfract. ult. 7 mm.
Aperture : alt. 5-25, diam. 3 nun.
.Hah. Yaylaymaw, ? Upper Burma.
" This species can easily be distinguished from the Indian
B. cerameopoma and B. lutea; it is imperforate, has fewer whorls,
a shorter and more obtuse spire, the columellar margin is less
acutely angled at base, the epidermis green instead of brown."
The original dimensions given by IS'evill are quoted below,
though some of them are not intelligible.
"Long. max. 8|, min. 71, diam. max. 6, min. 7| mil., long,
anfract. ult. 7 ; long, apert. o\, diam. 3 mil."
145. Bithynia pulchella (Benson).
mthynia pulchella (Benson), .7. A. S. B. v, 1836, p. 746 (as
Paludina) ; H. & T., C. I. pi. 38, figs. 5, 6.
p = Valveta, no. 9, Hutton, J. A. S. B. iii, p. 90.
Original description :—Testa ovato-coniea leviter striata, epidermide
olivacea, anfractibus rotundatis, suturis depressis. Aperturse
peritremate nigrescente; umbilico arco.
Alt. 7'25 mm.
Hab. Sylhet (Conch. Ind.).
Nevill designates two new varieties in his ' Hand List of
Mollusca in the Indian Museum,' p. 35, but without descriptions,
as follows':—
Var. obtusa.
Hah. Port Canning {Stoliczlca).
Var. pusilla.
Presumably a stunted form.
Alt. 6'5, diam. 4'5 mm.
Hah. Perozpur (Temple).
146. Bithynia suhpulchella, Nevill.
Bithynia subpulchella, Nevill, J. A. S, B. I, pt. 2, p, 157, pi. 0,
fig. 12.
Original description:—[Shell] narrowly rimate, conically ventricose,
of rather thin substance, slightly transparent, without