176 Annals of the South African Museum. 



cient material or poor condition, I have not ventured to found new 

 species on them. When hve examples come to hand, some of them 

 will doubtless prove worthy of names. 



I append rough diagnoses of the more remarkable. 



1. Trigonephrus, spec. (S.A.M. No. A 2817). 



Shell somewhat resembling in contour a small, blunt- apexed 

 T. porpliyrostoma, bleached and subfossil, but once, apparently, of 

 brownish colour with reddish purple peristome. Whorls 5, sculp- 

 ture resembling that of rosaceus. Aperture similar to that of 

 globulus ; peristome much thickened, columellar margin completely 

 overgroioing the umbilcus, so that the shell appears to be imperforate. 



Alt. max. 37"8; diam. 33-5; apert. 19-6xl7'5 mm.; ends of 

 peristome 12-75 mm. apart. 



Animal unknown. 



Hah. Great Namaland, Granite Berg, 27° 30' S. ; 15° 30' E. 

 (Eogers). 



Possibly an aberrant form oi porphyrostoma. 



2. Trigonephrus, spec. (S.A.M. No. 8235a). 



Shell slightly elongate-globose, thin, semitransparent, dark reddish 

 brown ; peristome brown. Spire a little produced, apex bluntly 

 rounded. Whorls 4i, rapidly increasing, all but the apical covered 

 with close, faint transverse, and microscopic spiral striae. Aperture 

 quadrate-ovate, shaped like that of T. globulus ; peristome moderately 

 thickened and refiexed, half concealing the narrow umbilicus. 



Alt. max. 25-8; diam. 21-1; apert. 13-5 x 10-1 mm.; ends of 

 peristome 9-6 mm. apart. 



Animal unknown. 



Hab. Cape of Good Hope. St. Helena Bay (Gould). 



A single specimen, possibly a sport from the local race of globulus, 

 but differing in its darker colour and the absence of the infra-sutural 

 white band, while in form resembling a squat T. namaquensis, var. 

 procerus, rather than globulus. A longer series is necessary before 

 its exact status can be determined. 



3. Trigonephrus, spec. 

 A little brown shell, almost similar in shape to T. ambiguosus, var. 

 compactus, but considerably smaller, with a white peristome. Its 



