110 STREPTOSTELE. 



S. MUCRONATA, Martens. PL 19, figs. 9-11. 



Rimate, somewhat solid, obliquely striate, yellowish white ; 

 aperture with a lanre flexuous parietal plica, right lip with a 

 superior tubercle and two lamellae, below it in the throat, colu- 

 mella with two teeth, lip thickened, reflected. Length, 25 mill. 



Bonjongo, W. Africa. 



S. BONJONGOENSIS, Tryon. PL 19, figs. 5, 6. 



Arcuately rimate, obliquely striate, yellowish white; aperture 

 with a securiform parietal plica, a superior tubercle on the outer 

 lip, and below it two approximate palatal plicae, a basal tooth 

 and three columellar plicae ; lip thickened, widely reflected. 



Length, 14 mill. 



Bonjongo, W. Africa. 



Described by Dr. von Martens as Ennea Buchholzi, but that 

 specific name being preoccupied by Martens in Streptostele, and 

 that of Martensiana being used by Morelet, I am compelled to 

 make a change of name without the power of extending the usual 

 courtesy in such circumstances. 



S. CYATHOSTOMA, Pfr. PL 19, fig. 7. 



Obliquely rimate, solid, closely longitudinally striate, whitish, 

 suture submarginate ; last whorl profoundly bisulcate near the 

 aperture, base subcristate ; lip expanded, sinuated above ; aper- 

 ture with a parietal plica, and three lamellae within the outer lip. 



Length, 20'5 mill. 



Old Calabar, W. Africa. 

 S. RINGENS, H. Adams. PL 19, fig. 20. 



Rimate, solid, longitudinally closely striate, whitish, suture 

 narrowly margined, last whorl trisulcate behind the aperture ; 

 aperture wrfh a parietal lamina, three profound columellar teeth ; 

 and several lamellae within the outer lip, of which four are 

 longer and more prominent ; lip continuous, expanded, sinuous 

 above. Length, 14 mill. 



Sierra Leone, W. Africa. 



