t^^l

S PAI.IIBESTKIXIDJB.
Original descviption:—Testa parva, subglobosa, rimata, longitudioaliter
nodoso-eostata; apertura late ovata, superne et ad
basin efiusa : peristomate continuo, incrassato, duplicato.
156. Bithynia (? Possarulus) costigera, Kiister.
Bithynia (? Fossarulus) costigera, Kiister, Conch.-Cab., Paludlna,
p. 33, pi. 7, figs. 18, 19.
Valvata sulcata, Eyd. & Soul, Vov. ' Bonite,' Zool. p. 517, pi. 31,
figs. 19-yi; H. & T., 0. I. pi. 151, fig. 10.
Original description :—Testa perforato-rimata, ovato-conica,
turrita, solidula, pallida flava ; spira acuta; ant'ractibus 6 con-
A'exis, subtilifcer concentrice lineatis, loiigitudinaliter stfiatis,
superne planulatis ; superioribus lineis tribus, ultimo numerosis
lineis elevatis, trans^^ersis obsitis ; apertura subrotunda, peristomate
recto, margine angulato.
Alt. 7*5, diam. 5-5 mm.
Jlab. Bengal.
Var. curta, Mvill, Hand List, pt. 2, p. 42.
A short form, apparently constant, with the spire less pi-oduced
or exserted.
Alt. 6-5, diam. 5-5 mm.
Ilab. Bangalore.
Subgenus HYDROBIOIDES.
Jlydrobioides, Nevill, Hand List, 1881, pt. 2, p. 42.
TYPE, Bithynia'! turt-ita, Blanford ; Burma.
liange. India ; Burma.
Shell sohd, turrite, rimato ; aperture ovate ; the margins of the
peristome united by a parietal callus.
157. ? Bithynia (Hydrobioides) turrita (Blanford).
? Bithynia (HydrobioiOes) turrita (Blanford), P. Z. S. 1869, p. 446
(as Fairbankia (an BithyniaJ).
Bithxjnia turrita, Nevill, in J. Anderson's Anat. & Zool. Hesearches
during Yunnan Exp., Calcutta, 1878 [1879], p. 890, pi. 80,
figs. 4, 4 a.
Original description:—Testa subpert'orata, turrita, sohdnla,
fulva, glabra, nitidula. Spira elongato-couica, sutura impressa.
Anfr. 7, convex!, ultimus antice subascendens, subttis rotundatus.
Apertura ovata, postice vix angulala, varice externa medioeri
instructa; peristoma undique expansiusculum, marginibus callo,
juii,ctis, exteruo leviter arcuato, columellari obliquo, antice cum
basali subaugulatim juncto. Operc.— ?