90 HELIX. 



H. HOWINSUL^E, Cox. Lord Howe's IsL 



H. CRUSTULUM, Cox. Solomon 's Is. 



H. CEOUANII, Le Guillou. Solomon's Is. 



H. HENSCHEI, Pfr. Solomon's Is. 



H. NAVIGATOKUM, Pfr. PL 18, fig. 62. 



Moderately umbilicated, rather solid, obliquely striated, reddish 

 grey, under a shining purplish brown epidermis, suture margined ; 

 whorls 5, a little convex, gradually enlarging, the last not descend- 

 ing, with compressed peripheral carina, base more convex. 



Diam. 18*5 mill. 



Navigator's Is. 



H. LUTEOCORNEA, Pfr. PL 18, fig. 63. 



Somewhat narrowly umbilicated, solid, thread-striate, waxy, 

 yellowish corneous, suture impressed ; whorls 5, convex, slowly 

 increasing, the last not descending in front, periphery angulated, 

 base subconvex ; aperture whitish. Diam. 18 mill. 



Navigator's Is. 



H. APPROXIMATA, Guillou. PL 18, figs. 64-67. 



Umbilicated, rather solid, striulate, very obscurely granular, not 

 shining, brownish, variegated with ashy yellow, suture linear; 

 whorls 6-7, flattened, the last not descending, acutely carinated, 

 carina separated from the scarcely convex base by an impressed 

 line; base of peristome callously thickened. Diam. 14'5 mill. 



Caroline Is. 



Eichler (Sitzb. Berlin, 144, 1880) has recently called attention to 

 discrepancies between Guillou's description of this species and the 

 shell identified with it by Reeve, Pfeiffer, Kuster, etc. 



Var. MARMOROSA, Hombr. et Jacq. Figs. 66, 67. 



Smaller, lighter colored, similarly variegated, carina less acute, 

 occasionally margined by chestnut bands. Diam. 14 mill. 



H. EURYDICE, Gould. PL 18, figs. 68-70. 



Widely, deeply umbilicated, thin, light greenish with chestnut 

 colored revolving lines above and below ; whorls 5-6, scarcely con- 

 vex, the last very acutely carinated, base planulate. Diam. 16 mill. 



Tonga Tabou, Vavao* 



