1S6 



HELICIN^;. 



According to Gould the oral tentacles in this genus are 

 forked or bifid ; the shell in young individuals is regular, 

 but when adult the last whorl is pressed towards the side 

 next the mouth, bending the axis out of the straight line, 

 and producing an obliquity in the form of the whorls. 

 Some of the species come from Western Africa, Liberia, and 

 the Guinea coast ; others are from Brazil, Cochin China, 

 and the East Indies. 



Sjiecies of Streptaxis. 



aberrata, Soul. 

 albida, Pfeiff. 

 alveus, Dkr. 

 Candeana, Petit. 

 Candida, Spice. 

 Cingalensis, Be)is. 

 comboides, D'Orb. 

 contusa, Ferns. 

 cryptodon, Moric. 

 Cumingiana, Pfeiff. 

 deformis, Ferns. 

 dejecta, Petit. 

 deplanata, Pfeiff. 

 discus, Pfeiff. 

 distorta, Jonas. 

 Dunkeri, Jonas. 

 Funcki, Pfeiff. 



glabra, Pfeiff. 

 Layardiana, Bens. 

 Maugerse, Gray. 

 nobilis, Gray. 

 ovata, Pfeiff. 

 Peroteti, Petit. 

 Petitii, Gould. 

 pro-strata, Gould. 

 pyriformis, Pfeiff. 

 Reclusiana, Petit. 

 rimata, Pfeiff. 

 Souleyetiana, Petit. 

 streptodon, Moric. 

 subregularis, Pfeiff. 

 Troberti, Petit. 

 uberiformis, Pfeiff. 

 Wagneri, Pfeiff. 



Genus STYLODONTA, Cristofori and Jan. 



Shell imperforate, above conoidal, globose at the base ; 

 whorls G 7, regularly increasing, the last ventricose at the 

 base, equalling the spire; columella short, sub-oblique, 

 truncato-dentate ; aperture depressly lunar or rounded ; 



