HELIX. 67 



whorls 6 -7, planulate, narrow, slowly increasing, the last two 

 slightly concave, periphery carinate, base angulated ; parietal 

 wall with a single lamella, and another in the throat between the 

 keel and basal angle. Diam. 6 mill. 



Borabora, Society Is. 

 H. ficta, Garrett (not of Pease), is a synonym. 



H. LAMELLOSA, Per. PL 12, figs. 32-34. 



Cylindrically, moderately umbilicated, thin, shining, glabrous, 

 acutely carinated, yellowish, with chestnut flames and macula- 

 tions ; whorls 7, flat, base inflated, angulated around the umbili- 

 cus ; aperture with two large parietal lamellae, the others smaller 

 one columellar, four basal and one upper. Diam. 7'5 mill. 



Sandwich Islands. 



H. FRICKI, Pfr. PL 12, figs. 35, 36. 



Widely umbilicated, rather thin, striate, yellowish corneous, 

 with chestnut maculations and strigations, suture margined ; 

 whorls 7, plane or a little concave above, the last subdeflected, 

 acutely carinated, a little tumid below ; aperture with two long, 

 parietal plications, none on the columella, four smaller ones on 

 the base, and one superior. Diam. 8 mill. 



Sandwich Islands. 



Differs from H. lamellosa in sculpture, wider umbilicus, and 

 want of the columellar lamella; Pease considered them identical. 



Unfigured Species. 



H. CONSTRICTA, H. IRREGULARIS, H. LACERATA, of Semper. 



Ins. Palau. 

 H. RUGATA, Pease. Sandwich Islands. 



II. Imperforate. 

 H. OPARICA, Anton. PL 12, figs. 37-39. 



Subimperforate, thin, costulate-striate, brownish, obsoletely 

 maculated with chestnut; whorls 4?-5, narrow, slightly convex; 

 aperture with three parietal and four basal lamellae. 

 Diam. 3'5 mill. 



Ins. Opara. 



H. ROTULA, Hombr. et Jacq. PL 12, figs. 40-42. 



Imperforate, smooth, light corneous, radiated with chestnut 



