HELICARION. 169 



pellucid-rayed, somewhat obliquely depressed above; margin 



subinflected. Diam. 13'5, alt. 8-5 mill. 



Australia. 



H. YERREAUXH, Pfr. PI. 38, fig. 40. 



Depressed, striulate, thin, diaphanous, hardly shining, greenish 

 yellow; spire subplanulate, suture margined; whorls 3J, 

 rapidly enlarging, the last depressed, the base rather narrow 



and flattened. Diam. 13, alt. 6 mill. 



Australia, Tasmania. 



H. CASTANEUS, Pfr. PL 38, fig. 41. 



Depressed, striulate, very shining, chestnut-olive ; spire plane; 

 whorls 3, the last large, the base widely membraneously mar- 

 gined, margin of aperture membranaceous. 



Diam. 9, alt. 5 mill. 



Australia. 



H. ROBUSTUS, Gould. PL 38, figs. 42, 43. 



Depressed globose, polished, pellucid, light greenish yellow, 

 lightly striate with growth-lines ; spire obtuse ; whorls 3, the last 

 large, rounded below ; columellar margin reflected at its inser- 

 tion forming a small slit. Diam. 12, alt. 6 mill. 



E. Australia. 



Dr. Cox thinks that the next species is a probable synonym. 



H. STRANGEI, Pfr. PL 38, figs. 44, 45. 



Depressed semiglobose, very thin, smooth, shining, light 

 greenish yellow, or corneous orange, suture submargined ; whorls 

 3, rapidly enlarging, the last depressed above, more convex 

 below ; columellar lip narrowly membraneously margined. 



Diam. 10, alt. 5 mill. 



Australia. 



An extensively distributed Australian species, varying much 

 in size, but very constant in its general characters. 



H. NIGER, Quoy. PL 38, figs. 46, 47. 



Oval, depressed-semiglobose ; whorls four, yellowish brown, 

 the last rather large. Diam. 12, alt. 5 mill. 



Port Western, Australia. 



The name is for the blackish animal. The species has not 

 been identified by Australian collectors. 



