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NOTES ON CEYLON LAND-SHELLS, WITH DESCRIPTIONS OF NEW 

 SPECIES OP CTATSOPOMA AND THYSANOTA. 



By E. R. SxKEs, B.A., F.Z.S., etc. 



Read \Qth June, 1898. 



PLATE X. 



The species of Cyathopoma hitherto recorded from Ceylon are : 



C. Ceylanicum, Eeddome. C. album, Beddome. 



C. Maria, Jousseaume. C. Prestoni, Sykes. 



C. artatum, Sykes. C. turhinatum, Sykes. 

 C. hftomita, Sykes. 



The occuiTence of C. album is doubtful. I am now able to add 

 two more species, which owe their discovery to the energy of 

 Mr. CoUett, who has also found " among lichens, Lower Ambagamuwa, 

 at 2,500 feet," a form, which I think it wisest, considering the little 

 we know of the specific variation of the present genus, to regard 

 for the present as a large variety of G. Predoni. This new variety 

 differs from the type in its greater size, having an additional whorl, 

 more elevated form, and in the more strongly marked spiral sculpture, 

 the lirse also being more numerous ; the periostracum, too, is thicker, 

 and, under a lens, gives an obsoletely decussated appearance to the 

 shell. 



1. Ctathopoma conoidettm, n.sp. PI. X, Eigs. Za-c. 



Testa dextrorsa, valde elevata, trochoidalis, mediocriter et perspective 

 umbilicata, periostraco brunneo induta, apice acutulo ; anfr. 7, lente 

 accrescentes, plano-convexi, primi leeves, reliqui obsolete spiraliter 

 lirati, ultimus liris duabus, unica in medio, altera infra, ornatus, 

 fere Isevis in regione umbilicari ; sutura valde impressa ; apertura 

 subcircularis, basi recedens, continua, peristomate leviter incrassato. 

 Alt. 2-6, lat. 1-5 mm. 



Hab. — Among fern-roots and under rocks, Binoya, Watawala 

 (0. CoUett). 



A very interesting form, remarkable for its trochoid shape (it is 

 almost turreted in form, owing to the deeply impressed suture) and 

 obsolete spiral lirae. Unfortunately the specimens are not in very 

 good condition. A smaller specimen, in better condition than the 

 type, is also figured (Eig. 3c). 



2. Ctathopoma Colletti, n.sp. PI. X, Figs. \a-c. 



Testa dextrorsa, elevata, pyra^idalis, mediocriter et perspective 

 umbilicata, cornea, strigis castaneis obliquis picta ; anfr. 4^, convexi, 

 regulariter accrescentes, primi Iseves, reliqui spiraliter lirati, ultimus 



'vol. III. DECEMBER, 1898. 11 



