66 HELIX. 



H. CONSOBRINA, Garrett. PL 12, figs. 43-45. 



Rather widely umbilicated, thin, with crowded, fine, nearly 

 straight membranous riblets ; yellowish horn-color, tessellated 

 and striped with reddish brown, suture channeled ; whorls 6, 

 very narrow, convex, subaugulate next the suture, slowly increas- 

 ing, the last not deflected ; parietal region with four (very rarely 

 three), palate with from seven to nine laminae, columella with or 

 without one. Diam. 3 mill. 



Huaheine, Society Is. 



H. SUBTILIS, Garrett. PL 12, figs. 46-48. 



Moderately umbilicated, thin, yellowish corneous, tessellated 

 and zigzagged with chestnut, with very thin, not crowded, subbi- 

 arcuate riblets, suture channeled; whorls 5, narrow, rounded, sub- 

 angulate near the suture, slowly increasing, periphery rounded, 

 base convex ; parietal w r all with two, palate with four (rarely 

 three or five) laminae. Diam. 3 mill. 



Huaheine Isl. 







H. PUNCTIPERFORATA, Garrett. PL 12, figs. 49-51. 



Narrowly umbilicated, thin, corneous, tessellated with chest- 

 nut, base corn-color, sometimes with chestnut radiations, striae 

 close-set, thin, rib-like, smaller and more crowded beneath, suture 

 deep ; whorls 6, narrow, slowly increasing, not descending in 

 front ; parietal region with two (rarely three), palate with four 

 or five laminae, one of them columellar ; in addition there are 

 parallel raised lines both on the w r all of the aperture and palate. 



Diam. 3 mill. 



Moorea, Society Is. 



."H. BORABORENSIS, Garrett. PL 12, figs. 52-54. 



Widely umbilicated, thin, corneous, under a light brown epi- 

 dermis, tessellated above with chestnut, with or without chestnut 

 rays beneath, sculpture of crowded riblets, suture deep ; whorls 

 7, convex, slowly increasing, the last with obtusely angulated 

 periphery, base convex ; parietal region with four, palate with 

 ;five or six laminae. Diam. 5 mill. 



Borabora Isl., Society Is. 



b. Carinate Species. 



H. CRETACEA, Garrett. PL 11, figs. 98-100. 



Very broadly umbilicated, rather solid, finely striated, whitish 

 with small, irregular, scattered chestnut spots, suture linear ; 



