184 HELICARION. 



*** Species included by Pfeiffer and Semper in Mariaella. 



H. RAFFRAYI, Bourg. PI. 43, figs. 56-58. 



Imperforate, semiglobose, more convex below, hyaline, rather 

 thin, shining, light yellowish corneous, smooth, last whorl 

 slightly striulate ; whorls 3, suture margined ; columellar lip a 

 little reflected above. Diam. 9, alt. 7 mill. 



Abyssinia. 

 H. ARAYATENSIS, Semper. PI. 43, figs. 59-61. 



Depressed, thin, rather smooth, shining pellucid, suture mar- 

 gined ; whorls 3J, rapidly increasing, the last depressed, with 

 obsolete spiral lines , aperture transverse. 



Diam. 13-14. alt. 5 mill. 



Ins. Luzon, Philippines. 



Perhaps a major var. of H. planulatus, Pfr. 



H. PLANULATUS, Pfr. PL 43, fig. 62. 



Yery depressed, ear-shaped, transparent horny, spire flattened, 

 whorls 3, plicately striated ; aperture very large, oblique. 



Diam. 11, alt. 4-5 mill. 



Ins. Luzon, Philippines. 

 H. PAPILLATUS, P'fr. PL 43, fig. 63. 



Depressed, nearly orbicular, pale horny, shining, pellucid, 

 light corneous, apex papillary, suture margined, last whorl with 

 obsolete spiral lines ; whorls 3^. Diam. 10, alt. 5 mill. 



Ins. Luzon, Philippines. 

 *** 

 ? H. PLICATULUS, Martens. PL 43, figs. 49-51. 



Rimate, thin, rather regularly plicatulate, shining, light green- 

 ish gray; whorls 3J, margin somewhat membranaceous, shortly 

 reflected at the umbilicus. Diam. 17, alt. 9 mill. 



Aburi, Gold Coast, W. Africa. 



? H. SEMIMEMBRANACETJS, Martens. PL 43, figs. 52-54. 



Depressed, auriform, very thin, lightly radiately striulate, 

 shining, light amber-colored, membranaceous below, spire plane ; 

 whorls less than 2J, rapidly enlarging, periphery angulate ; 

 aperture subhorizontal, showing the spire, lip membraneously 

 bordered. Diam. 19, alt. 6 mill. 



Victoria, and Delta of Cameroons River, W. Africa. 



