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Show 446 MR.W. T. BLANFORD ON NEW MOLLUSKS. [Jlllie 24, ovata, antice subeffusa; peristoma tenue, margine externo subrecto, basali antice porrecto, columellari sinuato. Operc. ? Long, exempli majoris decollati 25 mm., diam. 15 ; apert. oblique 13 longa, 8 lata. Exempli mediocris (etiam decollati), long. 13, anfr. ultimi 11, diam. maj. 14, min. 12|; apertura oblique cum peristomate 13 longa, 8\ lata. Hab. in flumine Iravadi superiore ad Male et Bhamo. Distinguished from the numerous varieties of M. variabilis, Bens., by the external margin of the peristome not being sharply curved outwards close to the base, but nearly straight, with a very gentle concave curve throughout. Unfortunately, the opercula have disappeared from all the specimens, as well as from some collected by myself in 1861. 4. BlTHYNIA IRAVADICA, Sp. nOV. Testa subrimata, ovato-conica, solidula, sub lente minutissime obsolete) decussato-striata, pallide olivacea vel fulva. Spira conica, apice obtusiusculo scepe eroso, sutura parum impressa. Anfr. 6, convexiusculi, ultimus ad peripheriam obtuse angulatus. Apertura subverticalis, ovata, postice angulata, antice subanyulata et subeffusa; peristoma tenue, rectum, marginibus callo junctis, columellari verticali cum basali angulum fere rectum faciente. Operc. normale. Long. 11, diam. 6| mm.; apert. 6 mm. longa, 4 lata. Hab. in paludibus et rivulis prope Mandele' urbem principalem hodiernam regni Avse. Intermediate between B. ceranospatana, v. Frauenfeld (B. cera-meopoma, Bs. MS.*), of India, and B. goniomphalus, Mor., of Siam. 5. FAIRBANKIA? (an BITHYNIA?) TURRITA, sp. nov. Testa subperforata, turrita, solidula, fulva, glabra, nitidula. elongato-conica, sutura impressa. Anfr. 7, convexi, ultimus subascendens, subtus rotundatus. Apertura ovata, postice angulata, varice externo mediocri instructa; peristoma undique expansiusculum, marginibus callo junctis, externo leviter arcuato, columellari obliquo, antice cum basali subangulutim juncto. Operc.Long. 6\, diam. 3 mm.; aperturae long. 2\, lat. 1| mm. Hab. ad Kyoukpong (in flumine Iravadi?). This looks like an estuary shell. In the absence of the operculum its position is doubtful; but if not allied to Fairbankia bombayana, W. Blanf., it may perhaps be a Bithynia, near B. nassa, Theobald. 6. CYCLOPHORUS SUBLAEVIGATUS, sp. nov. Testa aperte umbilicata, depresso-turbinata, solida, subleevigata, striatula, in anfractibus superioribus et nonnunquam rare in ultimo lineis impressis confertis spiralibus decussata, * I believe this common Indian shell is undescribed by Benson; at least I can find no description of it. It has been referred to by name in Benson's papers; and I regret Von Frauenfeld's selecting such a name as ceranospatana by which to describe it. |
