166 PUPINiE. 



Species of Bostryx. 



holostoma, Pfeiff. solutus, Trosch. 



rupestris, Phil. 



Sub-fam. PUPIN^. 



Tentacles rudimentary, minute, or entirely wanting. Foot 

 short, obtuse, or pointed behind. 



Shell cylindrical or fusiform ; whorls numerous, narrow, 

 equal; aperture small, frequently with elongated teeth or 

 thin laniinse; peristome generally non-continuous. 



Genus GIBBUS, Montfort. 



Shell deeply rimate, cylindrical, ovate-cylindrical, or com- 

 presso-triangular, oblique, closely striated or ribbed, last whorl 

 anteriorly ascending, compressed and sometimes gibbous 

 at the base ; aperture lunately oblong, or sub-tetragonal ; 

 columella rather straight, often plicate; peristome expanded, 

 shortly reflexed, the margins joined by a thin callus. 



Syn. Gibbulina, Beck. Gonidomus, Sivains. Plica- 

 domus, Swains. Gonospira, Swains. Ptychotrema, More h. 



Ex. G. Lyonetianus, Pallas, pi. 7G, fig. 1. 



The species of this genus are principally from the islands 

 on the African coast, the greater part coming from Mada- 

 gascar, the Isle of France, the Seychelles, and the Island of 

 Socotora. 



