Notes on South African Mollusca. 175 



bands, more frequent above, but also present, though fewer and 

 fainter, beneath ; peristome white and glossy ; interior nacreous blue. 

 Spire flattened. Whorls 4, flattish, rapidly increasing and ex- 

 panding, covered with close, regular, transverse striae which impart 

 a satin-like appearance to the shell. Suture simple, rather shallow. 

 Aperture quadrate-oval ; peristome very slightly thickened. Columella 

 extremely weak. Umbilicus deep and open. 



Dimensions of a shell from Oudebosch, in my collection : Diam. 

 maj. 29-9, min. 24-0; alt. max. 14-7; apert. 14-6xl3-0 mm.; ends 

 of peristome 8"2 mm. apart. 

 Animal unknown. 



Hah. Cape Province. Bredas Bosch and Oudebosch. 

 Type in Stettin Museum, from Bredas Bosch. 

 Layard's notes on this species run : " Of this beautiful shell there 

 are three very distinct varieties : — 



{a) a pale, almost white var., marked with sparse, faint, brown 

 lines ; 



[b) also pale, but covered with close-set, well-marked, dark brown 

 longitudinal lines. 



" These two varieties are from the open veldt at Bredasdorp, and 

 are, except slightly on the underside, destitute of epidermis. This, 

 I conceive, is burnt otf by the sun, for at Oudebosch, in Caledon 

 District, in the forest, my son and I took (c) a lovely variety, of a dark 

 brown colour, covered with a beautiful transparent epidermis, quite 

 polished and glistening on the underside, through which the dark 

 brown bands of the shell show quite plainly. In this locality the 

 shells are protected from the sun by the dense forest. I never saw 

 this shell from any other localities than those named, and it is there 

 not a common species." 



The pale coloration of Layard's vars. («) and (h) is not due to loss 

 of epidermis, as I have seen similarly marked specimens in excellent 

 condition. The ground colour is pale ci-eam, and the narrow reddish 

 bands may be either quite conspicuous or almost invisible. 



APPENDIX. 



Undetermined Varieties. 



x\ few specimens which have come under examination are not 

 referable to any of the preceding forms, but, owing either to insuffi- 



