356 AFRICAN NESOPUP^E. 



VII. AFRICAN SPECIES. 



a 1 . Angular and parietal lamellae present. 



& 1 . Angular lamella rather high, strong and curved. 

 c 1 . Length 3 mm.; nearly smooth. St. Helena. 



N. turtoni, no. 60. 



c 2 . Length less than 2 mm. ; closely rib-striate. 

 'd l . Sculpture of rather coarse, very oblique 

 striae ; shell ovate, white ; 1.5 x 1 mm. 

 British E. Africa. N. iota, no. 57. 



d 2 . Sculpture of fine, close rib-striae; shell 

 brown. 



e l . One broad median external fur- 

 row behind the aperture; lower 

 palatal and basal folds rather 

 deeply immersed; length 1.4 to 

 1.6 mm. S. Africa. 



N. griqualandic-a \, no. 54. 

 e z . One very slight impression behind 

 aperture; lower palatal but little 

 immersed, basal minute, in sub- 

 columellar position; length 1.6- 

 1.65 mm. S. Africa. 



N. farquhari, no. 55. 

 e s . One very slight impression be- 

 hind aperture; palatals rather 

 short ; no basal fold ; length 1.85 

 mm. Rhodesia. 



A T . b. rhodesiana, no. 56a. 

 e*. Two deep furrows behind aper- 

 ture; no basal fold; length 1.87 

 mm. Abyssinia. 



N. bisulcata, no. 56. 



b 2 . Angular lamella short and low; 2.25 to 2.4 mm. 

 long. 



c 1 . Surface densely pitted; one palatal fold or 

 none. Rhodesia. N. corrugata, no. 58. 



c 2 . Nianing, West Africa. 



AT. megalomastoma, no. 59. 



