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PLAKORBIS. 121<br />
acerescentes ; ultimus penultimo fere tertio latior ; apertura valde<br />
obliqua, ovata; peristoma acutum, margine superiore valde<br />
producto, arcuato.<br />
Alt. 1-2, diam. 4 mm.<br />
Hab. Barrackpore.<br />
240. Planorbis (Gyraulus) himalayanus {Button).<br />
Planorhis (Gyraulus) hhnalayanus (Hutton, MS.), Olessin, Concli.-<br />
Cab. 1884, p. 141, pi. 20, tig. 8.<br />
Original description:—.Testa depressa, solidula, nitidula,<br />
pellucida, arcuate striata ; supra plauulata centro concavo ; subtiis<br />
pauluJiim concava ; anfr. 4, modice eeleriter acerescentes, depressoovati,<br />
sutura leyiter immersa separati, in peripheriain fere<br />
«,ngulati, utrinque sequaliter convexiusculi; ultimus penultimo<br />
duplo latior; apertura perobliqua, ovata; peristoma acutum,<br />
marginibus disjunctis, margine superiore arcuata producto,<br />
iaferiore fere recto,<br />
Alt. 1-2, diam. 5'5 mm.<br />
Hab. Tinjori Valley,<br />
241. Planorbis (Gyraulus) liratus, Westerhmd.<br />
Planorbis (Gyrauhis) liratus, Westerlund, in Vega Exped. Vetenskapliga<br />
Jakttagelser, iv, p. 200, pi. 4, fig. 18.<br />
Original description:—Testa parva, plana, utrinque eentro<br />
subaequaliter impressa, lutescenti-cornea, supra et infra, ab apice<br />
ad aperturam sub lente perdistincte spiraliter liiieata, transversim<br />
vix striatula; anfr. 4, convexi, regulariter acerescentes, ultimus<br />
lente accresceus, subcylindraceus, basi perobsolete angulatus, supra<br />
paullo magis convexus ; apertura rotuudata.<br />
Alt. 1, diam. 2'5 mm.<br />
Ilah. Point de Gralle, Ceylon.<br />
242. Planorbis (Gyraulus) demissus, Westerlund.<br />
Planorbis {Gyraulus) demissus, Westerlund, in Vega Exped. Vetenskapliga<br />
Jakttagelser, iv, p. 204, pi. 4, fig. 16.<br />
Original description:—Testa depressa, utrinque centro impressa<br />
(supra magis), striatula, sculptura spirali nulla, angulo peripherico<br />
distincto, juvenis cornea, nitidula, matura alba, opaca; anfr. 4^,<br />
eeleriter sed ssepius (prtesertim subtus) irregulariter acerescentes,<br />
utrinque magis magisque centrum versus demissi, ultimus dilatatus,<br />
medio angulatus, utrinque subfsqualiter convexiusculus, antice<br />
paullo descendens; sutura sat profunda; apertura perobliqua,<br />
intus semper nitida, ovata, extus acutiuscuja, margiuibus callo<br />
elato in pariete contiguis, interiove leviter curvato, exteriore forte<br />
arcuato.<br />
Alt. 1-5, diam. maj. 6, diam. min. 5 mm.<br />
Hab. Point de Galle, Ceylon.
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