236 FAUXULUS. 



a~. All of the lamellae and plicae emerging to the lip edge; 

 shell delicately rib-striate, not opaque ; sinistral. 



Subgenus ANISOLOMA. 



6. Spire conic, conspicuously attenuate above ; 9 teeth ; 

 7x4 mm. F. pereximius, no. 6. 



6 1 . Spire conic or convexly conic, not attenuated; shells 

 smaller. 



c. Two lamellae on the columella, there being no 

 subcolurnellar ; 4 to 5 mm. long. 



F. mcbeanianus, no. 7. 

 c 1 . Three lamellae on the columella. 



d. Shell of stout, ovate-conic figure, diam. 

 about 2 mm. 



e. Imperf orate; parietal callous 

 spreading conspicuously upward. 

 /. Eight lamellae and plicae, no 

 basal plica. 



F. glanvUliana, no. 8. 

 jf 1 . Nine lamellae and plicas, a 

 basal plica present. 



F. g. novenarius, no. 8a. 

 f 2 . 10-11 lamellae and plicae. 



F. g. darglensis, no. 86. 

 e 1 . Perforate; parietal callous not 

 spreading upward ; 9 teeth. 



F. g. tomlini, no. 8c. 



d 1 . Shell narrower, cylindric-coiiic ; 9 teeth. 



F. ponsoribyanus, no. 9. 



1. FAUXULUS CAPENSIS (Kiister). PI. 39, figs. 1 to 9. 



Shell sinistral, similar to the narrower examples of P. 

 dolium in shape, ovate, cylindric, blunt-pointed, scarcely con- 

 vex, thin-walled, scarcely narrowed below, finely striate, dull- 

 shining, pale reddish-brown, the apex lighter. The 9 to 10 

 whorls are very low, oblique, nearly flat, only the last some- 

 what high ; the suture simple, weakly impressed. Umbilicus 

 oblique, rather large. Aperture small, obliquely rounded- 

 triangular, 5-plicate; two rather large folds stand on the 



