46 HELIX. 



H. ARCUATA, Pfr. PL 5, fig. 84. 



Umbilicated, thin, pellucid, light corneous, closely regularly 

 arcuately plicate; whorls 6, scarcely convex, with serrulate 

 carina, compressed around the umbilicus ; aperture wide. 



Diam. 5-5 mill. 



Cagayan, Ins. Luzon. 



Unjigured Species of Goniodiscus. 

 H. GORGONARUM, Dohrn. Cape Verd Is. 



H. aluta, Alb., is a synonym. 

 H. BOUVIERI, Morelet. Cape Verd Is. 



Probably a var. of H. Gorgonarum, Dohrn. 



H. ELATIOR, A. Adams. Japan. 



H. DEPRESSA, A. Adams. Japan. 



H. HYPTIOCYCLOS, Benson. Ceylon. 



H. MURPHYT and H. URARENSIS, Cox. Australia. 



H. EXAGITANS and H. DEPSTA, Cox. Norfolk I. 



H. KINGI, Brazier. Tasmania. 



H. STEPHENSI, Cox (Syns. H. Du Cani, H. plexus, H. spoilata, 



H. scrupulus, H. Coepta, of Cox ; H. Irvinse, H. Savesi, H. 



Pascoei, H. Floodi, H. Kingi, Brazier, teste R. M. Johnston). 



Tasmania. 



H. OCEANICA, Guillou. Tahiti. 



H. CAPILLATA, Pease. Kauai, Sandwich Is. 



Subsection AMPHIDOXA, Albers, 1850. 



H. MARMORELLA, Pfr. PI. 20, fig. 54. 



Shell perforate, very thin, distantly costulate, pellucid, straw- 

 colored with oblique chestnut strigations and maculations ; 

 whorls 3, scarcely convex, rapidly enlarging, base a little more 

 convex. Diam. 7 mill. 



Ins. Juan Fernandez. 



H. HELICOPHANTOIDES, Pfr. PI. 20, fig. 55. 



Perforate, thin, obliquely, closely costulate-striate, straw-color, 

 tessellated and strigate with chestnut ; whorls 3 J, rapidly 

 enlarging, the last depressed. Diam. 4'6 mill. 



Ins. Juan Fernandez. 



