PLANOKBIS. 117 



picta, nitida denseque striata, haud pellucida, supera facie 

 planiuscula, in medio profuride umbilicata, inferne concava ; 

 anfr. 3|-4 tutnidis, rotundatis infra prope suturam profundam 

 subangulatis ; apertura reniformi perparum obliqua ; labro tenui 

 f usco vel castaneo ; lamella in pariete aperturali tenuissima. 



Height 6'25, greatest diameter 16-25 mm. 



Hab. Pondicherry and the Coast of Coromandel. 



A very doubtful species. 



229. Planorbis hindu, Clessin. 



Planorbis hindu, Clessin, Conch.-Cab. 1885, p. 224, pi. 33, fig. 9. 



Original description : Testa discoidea, depressa, leviter regulari- 

 terque striata, albidula, diaphana, nitida ; supra infundibuliforme 

 concava, infra concava ; anfr. 4, modice celeriter accrescentes, 

 depresso-rotundati, utrinque sutura modice profunda separati, 

 inferne ad suturam vix obtuse angulati ; ultimus amplus, 

 penultimo duplo latior ; apertura perobliqua, late-lunata ; 

 peristoma acutum, marginibus callo tenui conjunctis ; margine 

 superiore valde arcuate producto. 



Alt. 4, diam. 11 mm. 



Hal). India. 



230. Planorbis orientalis, Lamarck. 



Planorbis orientalis, Lamarck, Anim. s. Vert, vi [2], p. 153 ; 

 Sowerby, in Reeve, Conch. Icon, xx, pi. 11, sp. 89; Clessin, in 

 Conch.-Cab. 1885, p. 227. 



Original description : PI. testa discoidea, utrinque plano- 

 depressa, subrugosa, fragili, cornea ; ultimo anfractu subangulato. 



Shell thin, irregularly undulated, yellowish-white, sinistral : 

 spire narrow depressed ; whorls a little raised above the suture ; 

 last broad, sloped, expanded towards the aperture ; aperture com- 

 pressed above and below, large, obliquely deflected ; margin 

 sinuous ; lower disc concave. 



Lamarck in his original, though scanty, description, gives the 

 diameter of the shell as 4 lines (=9 mm.). 



231. Planorbis modicus, Benson. 



Planorbis modicus, Benson, Adams Genera, ii, 1858, p. 261 ; Sowerby, 

 in Reeve, Conch. Icon, xx, pi. 9, sp. 76. 



Shell horny, tumid, spire funnel-shaped ; whorls 5, raised and 

 angular near the suture, last broad, sloped, concentrically finely 

 wrinkled ; aperture subtrigonal, lower disc concave, whorls 

 rather flat. 



Diam. maj. 19-75, diam. min. 16-25 mm. 



Hab. India. 



