6 HELIX. 



H. TANE^, Garrett. PL 11, figs. 95-9 7. 



Widely, perspectively umbilicated, thin, semipellucid, brown- 

 ish horn color, tessellated and rayed with chestnut, distantly, 

 somewhat irregularly, obliquely, arcuatety, plicately ribbed, 

 finer and more crowded on the base; whorls 6^, convex, slowly 

 and regularly increasing, slightly sulcate next the suture, the 

 last acutely carinate, flattened above, not descending in front, 

 convex beneath, angular around the umbilicus ; parietal region 

 with a small spiral lamella. Diam. 4'5 mill. 



Society Islands. 



H.janeae, Schmeltz and ff. Boraborensis, Pease, are synonyms. 



H. FICTA, Pease. PL 12, figs. 5-7. 



Widely, deeply umbilicated, a little solid, whitish, somewhat 

 challry, radiately strigated and tessellated with chestnut ; whorls 

 8, the outer sulcate near the margin, periphery acutely carinate, 

 and angulated around the umbilicus ; parietal wall with a spiral 

 lamella. Diam. 7 mill. 



Society Islands. 



C. Aperture with both parietal and palatal lamellae. 



a. Ecarinate. 

 H. POLYODON, G. W. Sowerby. PL 11, fig. 1. 



Widely umbilicated, rather thin, closely costate, variegated 

 with brown and white, suture impressed ; whorls 8, very narrow, 

 a little convex, the last not descending; aperture with two 

 lamellae on the parietal wall and two or more within the outer 

 lip. Diam. 4'66 mill. 



Ins. St. Helena. 



Pfeiffer has adopted for this species the name H. Helenensis, 

 Forbes. 



H. Alexandri^ For.bes, has two or three parietal plicae, and 

 eight additional within the lip, yet Pfeiffer considers the two 

 identical. H. polyodon, G. W. Sowerby, agrees with Alexandri, 

 and was the earliest described of the three species ; admitting 

 that the number of lip lamellae is variable, they may be merged 

 in one species, which should bear the oldest name H. polyodon. 



H. CUTTERT, Pfr. (unfigured). St. Helena. 



H. PHILIPPINENSIS, Semper (unfigured), Manilla, 



