DITKOPIS. 



25 



being in consequence less concave. Major diameter 0-J31 inch, 

 minor 0-27, axis O-U. {Bkinford.) 

 IJab. India : Travancore {Beddome). 



37. Ditropis convexa, Blaaford. 



Cydophoms {Ditropis) convexus, Blanfoi'd, J. A, S. B. xxxviii, part 2, 



lcSU9, p. 128, pi. l(i, lig. 3 (shell), p. 131, fig. 2 (lingual dentition); 



Nevill, Hand List, i, 1878, p. 278. 

 Ditropis convexus, iliinley .\: Theohald, Conch. Ind. 1875, pi. 136, 



ligs. 7, 10; Theobald, Cat. Shells lirit. India, 187H, p. 37. 

 Ditropis cunvexu, Kobelt & xMuUeudord, Nachr. Dents. Malak. Gas. 



xxix, 1897, p. 86; id.. Cat. I'neum. 1899, p. 37. 

 Ditropis^Ditropis) convexa, Kobelt, Das Tierreich,Lief. 16, 1902, p. 74. 



Original c^<;scripiit)jt:—" Testa ape rte unibilicata, depresso-con- 

 vexa, tenuis, nitida, vitrea, glabra, olivacea, niinutissime et obsolete 

 decussato-striatula. 8pira convexa, apice obtuso ; sutura impressa, 

 iutus marginata. Anl'r. 4, convexi; ultimus versus aperturani 

 paulum descendens, teres, juxta siituram fascia lata fusca pictus, 

 extns pallidior, carina una, valida ad peripberiaui, altera ad basin 

 circuuulatLis ; umbilico perspectivo, oinnes anfractus exhibens, 

 contertini spiraliter liratus. Apertura obli(]ua rotunda ; peristoma 

 rectum simplex, incrassatum alque continuum. Operculum fusco- 

 corneum, per-simile illi Cijdophori planorhis, marginibns externis 

 anixMctuum laciniatim productis. 



"Diam. maj. U, miii. 5^, axis 3^ railiem. Ap. diam. intus 2^. 

 "Shell openly 'umbilicated, depressly convex, thin, smooth, 

 shining, glassy, of an olive colour, with minute sub-obsolete 

 decussating striae, only visible beneath a powerful lens. Spire 

 convex, apex obtuse, suture impressed and with an internal 

 marginal ion, due to the prolongation of the inner whorls of the 

 keel surrounding the shell. Whorls 4, convex ; the last descending 

 slight Iv near the aperture, and becoming paler in colour in front 

 on the outer hali of the surface only, so that a band of darker 

 colour surrounds the shell close to the suture. Of the two keels 

 one is at the periphery, and rather lower in position tlian usual, 

 owing partly to the raised spire, tlie other is at the base, rather 

 towards the umbiHcus, which exhibits all the whorls, and is closely 

 spirally ribbed inside. Aperture round, oblique, peristome in one 

 plane, simple, thickened. Operculum very similar to that of 

 Cijdophorus planorhis, with the external edges of the whorls 

 lengt heued, ragged and split up into a fringe-like edge. Major 

 diameter 0-2t), minor 0-22, axis 0-14 inch." (Blanford.) 



Hub. India: Calcad Hills, Travancore ; TnmayeWy (Beddome). 



38. Ditropis planorbis, Blanford. 



Ci/cloj)h'>rus {Ditropis) planorbis, Blanford, J. A . S. B. xxxviii,_part 2, 



1869, p. 126, pi. 16, tig. 1; Nevill, Hand List, i, 1878, p. 2i8. 

 Ditropis 2)lanorbis, Uanl'ev & Theobald, Conch. Ind. 1875, pi. 136, 



tigs. 5, 6; Theobald, J.' A. S. B. .xlv, part 2, 1876, p. 18->; id. Cat. 



