PLANOBBIS. 121 



accrescentes ; ultimus penultimo fere tertio latior ; apertura valde 

 obliqua, ovata ; peristoma acutum, margine superiore valde 

 producto, arcuato. 



Alt. 1-2, diam. 4 mm. 



Hal). Barrackpore. 



240. Plan or bis (Gyraulus) himalayanus (Button}. 



Planorbis (Gyraulus) himalayanus (Hutton, MS.), Clessin, Oonch.- 

 Cab. 1884, p. 141, pi. 20, tig. 8. 



Original description : Testa depressa, solidula, uitidula, 

 pellucida, arcuate striata ; supra plauulata centre concavo; subtus 

 paululum concava ; anfr. 4, modice celeriter accrescentes, depresso- 

 ovati, sutura leviter immersa separati, in peripheriam fere 

 augulati, utrinque aequaliter convexiusculi ; ultimus penultimo 

 duplo latior; apertura perobliqua, ovata; peristoma acutum, 

 marginibus disjunctis, margine superiore arcuata producto, 

 inferiore fere recto. 



Alt. 1-2, diam. 5'5 mm. 



Hal. Tinjori Valley, 



241. Planorbis (Gyraulus) liratus, Westerlund. 



Planorbis (Gyraulus) liratus, Westerlund, in Vega Exped. Vetens- 

 kapliga Jakttagelser, iv, p. 206, pi. 4, fig. 18. 



Original description: Testa parva, plana, utrinque centre 

 subaequaliter impressa, lutescenti-cornea, supra et infra, ab apice 

 ad aperturam sub lente perdistincte spiraliter lineata, transversim 

 vix striatula ; aui'r. 4, convexi, regulariter accrescentes, ultimus 

 leute accrescens, subcylindraceus, basi perobsolete angulatus, supra 

 paullo magis convexus ; apertura rotundata. 



Alt. 1, diam. 2'5 mm. 



Nab. Point de Gralle, Ceylon. 



242. Planorbis (Gyraulus) demissus, Westerlund. 



Planorbis (Gyraulus) demissus, Westerlund, in Vega Exped. Vetens- 

 kapliga Jakttagelser, iv, p. 204, pi. 4, fig. 16. 



Original description: Testa depressa, utrinque centre impressa 

 (supra inagis), striatula, sculptura spiral! nuila, angulo peripherico 

 distincto, juvenis cornea, nitidula, matura alba, opaca ; aufr. 4^, 

 celeriter sed saspius (praesertim subtus) irregulariter accrescentes, 

 utrinque magis magisque centrum versus demissi, ultimus dilatatus, 

 medio angulatus, utrinque subaiqualiter convexiusculus, antice 

 paullo descendens ; sutura sat profunda ; apertura perobliqua, 

 intus semper nitida, ovata, extus acutiuscula, margiuibus callo 

 elato in pariete contiguis, interiore leviter curvato, exteriore forte 

 arcuato. 



Alt. 1-5, diam. maj. 6, diam. min. 5 mm. 



Hal. Point de Gralle, Ceylon. 



