1905.] H. B. Preston : New land and marine shells. 135 



5. Microcystis thwaitesi, Pfr., var. depressa, var. nov. 



Much more depressed than the typical form, the spire being 

 scarcely raised at all, in other respects it appears to be normal. 



Habitat — Uda Pussellawa, Ceylon. 



6. Microcystis winifredce, sp. nov. 



Shell depressed, narrowly perforate, thin, pohshed, shining, 

 yellowish horn colour ; whorls 3, sculptured throughout with ver^^ 

 minute, spiral striae ; sutures impressed ; umbilicus deep, very 

 narrow, partly concealed by the refiexed columella ; peristoma 

 simple ; aperture broadly lunate. 



Altitude . . . . 4*75 mm. 



Diam., major . . .. 8*5 ,, 



Aperture, alt. . . 4*25 ,, 



diam. .. 3-5 



Habitat — Uda Pussellawa, Ceylon. 



7. Thysanota elegans, sp. nov. 



Shell trochiform, rimate, vitreous, yellowish white ; whorls 6, 

 the first two rounded, spirally striate, the remainder sculptured 

 with fine spiral lines crossed by coarser, transverse, arcuate striae 

 and bearing a strong, peripheral, hairy liration, the last whorl 

 sharply carinate at the base ; base of shell spirally striate only ; 

 sutures deeply impressed ; umbilicus very narrow ; peristome 

 simple ; aperture narrow, sublunate. 



Altitude . . . . 175 mm. 



Diam., major . . . . i"5 ,, 



Habitat — Uda Pussellawa, Ceylon. 



Differing from Thysanota hispida, Sykes,' in its much 

 smaller size and more graceful form ; both the spiral and arcuate 

 transverse striae appear to be a character which are also absent in 

 T. hispida. 



8. Glessula sinhila, sp. nov. 



Shell moderately thin, pohshed, dark yellowish horn colour, 

 obtusely lanceolate ; whorls 7^, marked with very faint Hues of 

 growth only ; sutures impressed ; columella descending in a very 

 oblique curve ; peristome simple, bent slightly inwards above ; 

 aperture inversely, elongately auriform. 



Altitude . . . . 2175 mm. 



Diam., major . . 9 ,, 



Aperture, alt. .. 775 >> 



diam. .. 4 ,> 



Habitat — Cevlon. 



J Proc. Malac. Soc. London, vol. iii, p. 160. 



