170 HELIOARION. 



H. MASTERSI, Cox. PI. 38, figs. 48, 49. 



Depressed, very thin, smooth, transparent, polished, with fine 

 arcuate striae and a few faint spiral lines, bright golden yellow, 

 sometimes greenish tinged, suture impressed, narrowly margined ; 

 whorls 3, the last rather depressed above, more conve'x below, 

 where it is widely membraneous. Diam. 14, alt. 4*25 mill. 



Kiama, N. So. Wales. 



The animal is whitish, and not gra} r as in V. Strangei, and the 

 shell is more depressed, with half the base membraneous. 



H. HELENA, Godwin-Austen. PI. 38, figs. 50, 51. 



Elongately oval, smooth, polished, pale greenish yellow, spire 

 flat ; whorls 2 J, rapidly increasing, the last much expanded and 

 elongated in front ; peristome thin, arcuate above. 



Diam. 7'3 mill. 



Sydney, N. S. Wales. 

 H. MEGASTOMA, Cox. PL 38, figs. 52, 53. 



Depressed, elongate auriform, smooth, very thin, transparent, 

 greenish yellow, shining, very faintly striated, spire not promi- 

 nent ; whorls 3, the last depressed above, rounded at the periphery 

 and below, left margin of aperture and base of the shell flattened, 

 membraneous. Diam. 11-25, alt. 2'5 mill. 



Clarence River, Australia. 



Placed by Pfeiffer in Helicarion, which, from its shape it can 

 scarcely be. Appears to be a genuine Yitrina. 



H. KEPPELLI, Pfr. PL 38, figs. 54-56. 



Depressed, thin, very shining, pellucid, arcuately striated, 

 especially at the suture; greenish yellow, suture* submargined ; 

 whorls 3, rapidly enlarging, the last with a convex, narrow base; 

 columellar lip membraneously submargined. 



Diam. 14, alt. 6 mill. 



New Caledonia. 

 H. HILLI, Cox. PL 38, figs. 57, 58. 



Depressed, thin, shining, with incremental striae, and slight 

 irregular distant undulating spiral lines ; yellowish brown, 

 lighter on the base ; whorls 4|, rapidly increasing, the last 

 largely expanded ; lip submembraneous. 



Diam. 8-5, alt. 3'5 mill. 



Top of a high mountain, Lord Howe's Island. 



