176 Annals of the South African Museum. 



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

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

 will doubtless prove worthy of names. 



I append rough diagnoses of the more remarkable. 



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



Shell somewhat resembling in contour a small, blunt-apexed 

 T. 2)orp]ii/rostoma, 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 

 globidus ; peristome much thickened, columellar margin completely 

 overgrowing the umbiicus, so that the shell appears to be imperforate. 



Alt. max. 37'8; diam. 33'5; apert. 19'6xl7 4 5 mm.; ends of 

 peristome 12'75 mm. apart. 



Animal unknown. 



Hal. GREAT NAMALAND. Granite Berg, 27 30' S. ; 15 30' E. 

 (Rogers). 



Possibly an aberrant form of porphyrostoma. 



2. TRIGONEPHBUS, 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 4^, rapidly increasing, all but the apical covered 

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

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

 thickened and reflexed, half concealing the narrow umbilicus. 



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

 peristome 9'6 mm. apart. 



Animal unknown. 



Hub. CAPE OP 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. 

 procems, 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 



