HELIX. 67 



whorls 6 i-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, Fer. PI. 12, figs. 32-34. 



Cylindrically, moderately nmbilicated, 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 lamellse, the others smaller 

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



Sandwich Islands. 



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



Widely umbilicated, rather thin, striate, yellowish corneous, 

 with chestnut maculations and strigations, suture margined ; 

 w r horls 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. 



Unfignred Species. 



H. COXSTRICTA, 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 



