PHASIS-TRACHYCYSTIS. 139 



broad bow-shaped sweep on the convexity of the whorl. Aperture 

 lunate, oblique; peristome thin, simple, well expanded at the col- 

 umellar insertion. 



Alt. 3, greater diam. 4-1, lesser 3* mill. ; alt. apert. nearly 2 mill. 



Alt. 3*7, greater diam. 4*6 mill. 



South Africa. 



Helix aulacophora ANCEY, Bull. Soc. Mai. Fr. vii, p. 158, 1890. 



This small species belongs to the typical group of Pella. It is 

 more elevated than P. rariplicata, with narrower umbilicus and 

 closer riblets, but in P. bisculpta the riblets are much finer and 

 closer still, and the spire less conoidal. 



The specimens described and figured were received from Mr. John 

 Ponsonby, of London. 



P. TABULA Chaper. PI. 43, figs. 52, 53. 



Shell of the same size and general form of H. capensis Pfr. ; whorls 

 globulose but a little less enveloping ; spire less high, shell thinner. 

 Sculpture consisting of crowded, regular strise of growth covering 

 whole surface ; the strise being whitish, the interspaces pale brown 

 varying in intensity. The nucleus is shining and brighter brown; 

 the strise beginning after the first one or one and one-half whorls, the 

 next two whorls being nearly white; but the general color is dark- 

 ened by the deepening in intensity of the color of the interspaces 

 between the striae. 



Table Mountain, Cape Town. 



Helicopsis tabular CHAFER, Bull. Soc. Zool. Fr. 1885, p. 483, 1. 11,. 

 f. 4, 5. 



Chaper, from whom the above description is taken, states that he 

 collected this species when taking a rapid walk up Table Mountain. 

 The thinness of the shell is explained by its habitat on this plateau 

 of gray quartzite. 



P. BATHYCCELE Melvill & Ponsonby. PI. 35, fig. 13. 



Shell minute, very profoundly umbilicated, thin, horny-greenish, 

 planorbiform, the apex nearly immersed ; whorls 6, convex, 

 impressed at the sutures, encircled with regular longitudinal line ; 

 the last whorl rapidly increasing, effuse below ; peristome thin, 

 simple; aperture lunar. Alt. 1J, diam. 2} mill. (M. & P.) 



Cragie Burn, Somerset East, S. Africa, under dead leaves in the 

 bush. (Miss M. L. Bowker.) 



