146 Annals of the South African Museum. 



Miiller. The transition is through a shell resembling the Robben 

 Island form, but with a rose-coloured lip and a general bluish-purple 

 tint throughout, also found in Namaqualand. There are two forms 

 of this, one globular, the other elongated, 44 x 38| mm. 



" There is yet another variety from Namaqualand, a small, stout, 

 glossy form, 19-5x17 mm., of a pinkish colour, of which I have 

 only seen two examples. 



" I am ignorant of the exact localities whence these varieties 

 were severally procured ; they were brought out by the late 

 James Chapman, who also procured a solid white variety in 

 Ovampoland. 



" I suspect the coarse, solid shell of the variety called rosacea must 

 be meant as a protection against the great heat and drought of the 

 locality where found. 



" The small purple-mouthed variety from George runs into one of 

 the varieties of Helix lucana, Mull., from the same locality." 



The shell selected for description is of average size, from Hout 

 Bay, Cape Peninsula, and the animal is taken from a similar 

 specimen, which was broken for anatomical purposes. This solid, 

 bluish-purple form is that which is now found alive all over the 

 extreme south-western corner of the Cape Province, the largest 

 Peninsula example which I have measured being : alt. max. 37'6 ; 

 diam. 33; apert. 23-4xl7"5 mm. ; and the smallest living one : alt. 

 max. 25'7 ; diam. 25; apert. 15-7 x 12-2 mm. 



Whether this form is of comparatively recent growth from a 

 smaller one, I cannot say ; but in an old shell mound at Milner- 

 ton are the subfossil remains of a smaller race, measuring about 

 22^x21|^ mm., and a somewhat similar variety is mentioned by 

 Layard as existing, in bleached condition, at Nord Hoek. Almost 

 the same is now found alive on Dassen Island (PI. II., fig. 2), but 

 the shell is thinner and apparently of a redder hue, with a browner 

 peristome than the normal form. 



This leads up to a very distinct local race, inhabiting the main- 

 land at St. Helena Bay. In it, the shell nearly regains the size 

 of typical globulus, which it also resembles in general shape and 

 drooping aperture, but it is of thinner texture, rosy brown in colour, 

 and the surface is more glossy and far more malleate. The four 

 specimens known to me measure : — 



Alt. max. 29-8; diam. 28-5; apert. 17-3 x 14-1 mm. 



27-0; „ 28-7; „ 16-9 x 13-3 „ 



27-0; „ 2G-9; „ 15-2 x 12-2 „ 



26-2; „ 25-1; „ 13-9 x HI „ 



