PULMONATA. 71 



13. Helicarion PLANOSPJRA. 



Shell ovate, thin, slightly striated, pelhicid, shining, greenish 

 hovn-coloured ; spire small, flat ; suture scarcely impressed ; 

 whorls three, enlarging very rapidly, the last depressed above, 

 more convex and narrow beneath, with a slight membranaceous 

 edge ; aperture large, very oblique, lunate-roundish, somewhat 

 pearly within ; peristome thin : right margin arcuately dilated 

 forwards and slightly expanded, columellar margin strongly 

 arched. Height 7, greatest breadth 13, least breadth 10 mill. 



(P/r.) 



Vitrina planospira, Pfr. in Z.f. M. 1853, 51 ; Mon. Suppl. 623 ; 



Jet. 6. f. 14-16. 

 Hab. Salomon's Islands. 



14. Helicarion dimidiata. 



Shell much-depressed, with the periphery ovate, ver^f thin, 

 sculptured with minute arcuate stris, silky shining, pale horn- 

 coloiued ; spire nearly flat ; whorls two and a quarter, which are 

 open beneath, with a very narrow membranaceous edge ; aper- 

 ture horizontal, as large as the whole shell ; peristome simple, 

 with regularly curved margins. Height l^-, greatest breadth 5^, 

 least breadth 4 mill. {Pfr.) 



Vitrina dimidiata, Pfr, in Proc. Z. S. 1851 ; Mon. Suppl. 6. 

 Hab. New Zealand {Strange). 



15. Helicarion Salomonia. 



Shell globose-conic, extremely thin, sculptured with crowded 

 oblique folds, pellucid, shining, brownish- olivaceous; spire conic, 

 rather blunt ; suture impressed ; whorls four, convex, the last 

 forming about three-flfths of the total length ; aperture oblique, 

 ovate ; peristome simple, straight, with regularlv arched margins. 

 Length 11, breadth JJ mill. {Pfr.) 



Vitrina Salomonia, Pfr. in Z.f. M. 1853, 51 ; Mon. Suppl. 623 ; 



Ic. t. 6. f. 17-19. 

 Hab. Salomon's Islands. 



Asiatic. 



16. Helicarion irradians. B.M. 



Shell depressed, with the periphery ear-shaped, thin, with 

 crowded, arcuate, radiating impressed lines, obsoletely decus- 

 sated with irregular spiral striae, diaphanous, scarcely shining, of 

 a cinnamon hora-colour above ; spire small, raised into a slight 

 papilla ; suture impressed, bordered ; whorls nearly foiu-, rather 



