STREPTAXID^. 1 1 



peristome expanded, the right margin flexuous, thickened in the 

 middle. 



EDENTULiNA, Pfeiffer, 1855. Peristome not toothed. E. 

 ovoidea, Brag. 



ELMA, H. Adams. A strong sinus at the outer lip ; aperture 

 edentvilous. U. Swinhoei, H. Adams. Formosa. 



GONAXis, Taylor. Shell pupiform, axis of the apical whorls 

 diverted to the right. 



UNiPLiCARiA, Pfeiffer, 1855. Parietal margin lamellate; outer 

 lip edentulous. E. cerea, Danker (xcii, 59). Madagascar. 



ENNEASTRUM, Pfeiffer, 1855. Parietal and outer margins of 

 aperture both lamellate. E. elegantula^ Morelet. 



GULELLA, Pfeiff"er, 1855. Shell ovate, parietal margin lamellate, 

 outer lip multidentate. E. capitata, Gould (xcii, 60). E. Africa. ' 



PTYCHOTREMA, Morch, 1852. (Cyclodontina, Beck, 1831.) E. 

 Guineensis, Beck. 



HUTTONELLA, Pfeiffer, 1855. Shell cylindrical, parietal margin 

 plicate ; outer lip quadridentate. E. Kt'aussi, Pfeiffer. 



DiAPHORA, Albers, 1850. Cylindrical, umbilicated, apex obtuse, 

 base obsoletely carinate ; whorls ten, flattened, the last detached ; 

 aperture pyriform, with slightly expanded lip. 2 sp. Indo- 

 China, Philij)pines. E. Cylindrelloidea, Stol. 



Streptostele, Dohrn, 1866. 



Distr. — 4 sp. Prince's Isl., Africa. S. Nevilli, H. Adams 

 (xcii, 61). Seychelles. 



Shell of the form of Achatina, but hyaline as in Streptaxis 

 and Ennea ; pillar-lip short, twisted and thickened. Color of 

 the animal intensely red or yellow, as in the two last-named 

 genera. 



GriBBULiNA, Beck, 1831. 



Syji. — Gibbus, H. and A. Adams, 1855. 



Distr. — 43 sp. Mauritius, Isle of France, Madagascar, Sey- 

 chelles. 



Shell corneous or white, solid, calcareous, pupiform or tur- 

 binate, summit obtuse; last whorl gibbous, sometimes angulated 

 and deformed ; umbilicus large, not deep ; lip reflected, its 

 extremities united by a callus ; columella sometimes plicate, 



GIBBUS, Moutf., 1810. Shell subconical, whorls irregular, 

 laterally compressed. G. Lyonettiana, Pall, (xcii, 62). Isle of 

 France. 



GONioDOMUS, Swains., 1840. (Idolum, Pfeiff"er, 1855.) Ovate, 

 ventricose, obliquely costulate. G. pagoda, Fer. (xcii, 63). 

 Mauritius. 



PLicADOMUS, Swains., 1840. Spire moderate, subconic, obtuse ; 

 outer lip reflected ; surface obliquely costulate. G. sulcata, Miill. 

 (xcii, 64). Mauritius. 



