68 HELIX. 



above; whorls 4, moderately increasing, the last rounded, not 

 descending ; no teeth. Diam. 3'3 mill. 



Ins. Mangareva. 



Perhaps not adult. As there are no teeth, this can scarcely 

 be considered a member of the group where it is placed by 

 Pfeiffer. 



H. IMPERFORATA, Pease. (Unfigured). Ins. Aitutake. 



H. Aitutakiana, Mousson, is a synonym. 



Subsection LAOMA, Gray, 1849. 



H. LEIMONIAS, Gray. PI. 13, fig. 55. 



Subimperforate, somewhat solid, smooth, shining, pellucid, light 

 corneous, maculated with chestnut ; whorls 7, flattened, the last 

 acutely carinated, base plane ; aperture with one parietal lamella 

 and two in the right margin. Diam. 2*3 ; alt. 2'7. 



New Zealand. 



H. PCECILOSTICTA, Pfr. PI. 13, fig. 56. 



Perforate, thin, closely plicate, fulvous, maculated with chestnut, 

 diaphanous, suture margined ; whorls 5J, narrow, a little convex, 

 the last carinate, base plane; columella with a single plication, 

 aperture otherwise unarmed. Diam. 4 mill. 



New Zealand 



H. B1LAMELLATA, Pfr. PI. 13, fig. 57. 



Narrowly umbilicated, thin, corneous, regularly plicate; whorls 9, 

 carinated, carina exserted, acute, subaculeate, base slightly convex ; 

 aperture with a parietal and columellar lamella, the latter stronger. 

 Diam. 4, alt. 4'5 mill. 



Ins. Opara. 



It is Pitys Oparana, Beck. 



H. MARINA, and H. NERISSA, Hutton (unfigured). New Zealand. 

 (ACTINARIA, Pfr., 1855.) 



H. PIRRIEANA, Pfr. PI. 13, fig. 58. 



Perforate, thin, smooth, scarcely lightly striulate, pellucid, 

 corneous, suture margined ; whorls 7-8, slightly convex, very 

 narrow, the last carinate, bidentate within the base. 



Diam. 5 mill. 



Koondah Mts., India. 



