38 HELIX. 



FATUA, Pfr. The latter I have included in Conulus. These are 

 all New Zealand species. 



VI. Polynesian Species. 



H. RADIELLA, Pfr. PI. 8, fig. 18. 



Moderately umbilicated, thin, everywhere closely costulate, 

 corneous, with undulating radiating chestnut strigations, broader 

 at the periphery; whorls 5J, a little convex, the last subangu- 

 lated ; the base a little flattened. Diam. 4-75 mill. 



Ins. Opara. 



H. pardalina, Desh., and H. undulata, Fer., are synonyms. 



H. FILTOLA, Fer. PL 8, figs. 19-21. 



Yery widely umbilicated, radiately striate-plicate, reddish 

 chestnut; whorls convex, narrow, striae furcate at the umbilicus. 



Diam. 9 mill. 



Ins. Tonga. 

 H. GRADATA, Gould. PI. 8, figs. 22-24. 



Planorboid, umbilicated, thin, shining, brownish-green, varie- 

 gated radiately with yellow ; whorls 5, closely obliquely striated, 

 decussated by interrupted spiral striae, last whorl subangulated, 

 deflected towards the aperture, suture channeled, base angulated 

 at the umbilicus. Diam. 5 mill. 



Ins. Tongataboo. 

 H. TIARA, Mighels. PI. 8, figs. 25-27. 



Widely conically umbilicated, rather thin, arcuately striated 

 above, a little shining, yellowish, with lightning-like chestnut 

 strigations ; whorls G, a little convex, slowly increasing, the last 

 rather narrow, not descending, base scarcely striate ; aperture 

 subopaline, peristome margins approximating. Diam. 12 mill. 



Ins. Kauai, Sandwich Is. 

 H. MODICELLA, Fer. PI. 8, figs/ 28-32. 



Widely umbilicated, rather thin, closely costulate, yellowish, 

 strigated tessellately with chestnut; whorls 5, convex, periphery 

 rounded, suture well impressed ; aperture obliquely subcircular. 



Diam. 3 mill. 



Tahiti, Kerm.andec, Ellice Is. 



The synonyms are H. Atiensis, Pease, and H. vicaria, Mous- 

 son (figs. 31, 32). 



