146 PHASIS-TRACHYCYSTIS. 



Three specimens, of which two are perfect ; a plain, smoothish, 

 horny shell, bearing indistinct lines of longitudinal ribbing (when 

 closely examined with a lens), very minutely decussated by spiral 

 strise. Allied to H. Loveni Krauss, represented by only a poor spec- 

 imen in the National Collection, South Kensington, from which this 

 species seems to differ chiefly in the absence of any keel at the periph- 

 ery, and likewise in there being no sign of epidermis, which in H. 

 Loveni adheres to the ribs and renders them more conspicuous. 

 (M. & P.) 



P. EPETRIMA Melvill & Ponsonby. PI. 35, fig. 6. 



Shell narrowly umbilicated, depressed, thin, corneous, sub- 

 pellucid ; all over closely striatulate, striae oblique, regular ; spire 

 depressed-convex ; whorls 4, slightly convex, impressed at the 

 sutures, the last whorl rapidly increasing. Aperture lunar ; per- 

 istome simple, acute, shortly triangularly reflexed at the columellar 

 margin. Alt. 3, diam. 4* mill. (M. & P.) 



Somerset District, South Africa. 



Helix (Pella) epetrima M. & P., Ann. Mag. K H. (6), ix, p. 84, 

 t. 4, f. 3. 



Allied to H. bisculpta Benson, from which this little species differs 

 in its whorls being more discoid, greater depression of spire, and 

 smaller size ; the system of sculpture, so far as the closely ranged lon- 

 gitudinal striae are concerned, though apparently identical, is found 

 upon examination with a strong lens to be far more clearly and 

 finely developed in H. bisculpta, the strise in that species looking 

 like finely cut serrations round the edge of the periphery while in 

 H. epetrima they are barely perceptible and the edge of the shell 

 looks ragged in comparison. (M. & P.) 



P. CRAWFORD: Melvill & Ponsonby. PI. 35, fig. 10. 



Shell narrowly umbilicated, globose-depressed, hyaline, shining 

 above, olivaceous-satiny beneath, entirely smooth all over; spire 

 slightly raised, apex obtuse; whorls 5, slightly convex. Aperture 

 lunar, lip simple, acute, columellar margin suberect, widely reflexed 

 above, forming a triangular lamina as in H. bisculpta. 



Alt. 11, diam. 16 mill. (M. & P.) 



Port Elizabeth, S. Africa. 



Helix (Pella) crawfordi M. & P., Ann. Mag. N. H. (6), vi, 

 p. 469 ; ix, p. 94, t. 4, f. 4. 



