HELIX. 39 



Yar. VICINALIS, Mousson. 



Whorls more rounded, costulate but thin ; whitish with macu- 

 lations and flames of chestnut. 



H. LAMELLICOSTA, Garrett. PI. 8, figs. 33, 34. 



Widely umbilicated, orbicular, thin, subpellucid, brown or 

 fulvous brown, unicolored or tessellated with deeper brown, 

 radiately, rather distantly, lamelliformly costate, suture deeply 

 impressed ; whorls 4, convex, slowly and regularly increasing, 

 the last not descending in front, periphery rounded. 



Diarn. 3 mill. 



Society Islands. 

 H. TENUICOSTATA, Garrett. PI. 8, figs. 35-37. 



Perspectively umbilicated, thin, pellucid, a little shining, light 

 corneous, not variegated, laminately costate, the ribs thin, rather 

 close, oblique, slightly sinuous, continued on the base, interstices 

 lightly, closely striate, suture deep ; whorls 4, plano-convex, 

 rapidly enlarging, base convex. Diam. 4*5 mill. 



Rarotonga, Coolers Is. 

 H. CANALIS, Garrett. PL 8, figs. 38-40. 



Widely, perspectively umbilicated, thin, subpellucid, slightly 

 shining, brownish corneous, with darker strigations, closely, 

 obliquely, sinuously costate, suture deeply channeled ; whorls 5, 

 somewhat convex, the last a little deflected anteriorly, base 

 rounded. Diam. 6 mill. 



Rarotonga, Cook's Is. 

 H. PROXIMA, Garrett. PL 8, figs. 41-43. 



Deeply moderately umbilicated, thin, subpellucid, closely, 

 sinuously, obliquely, rudely striated, yellowish corneous (rarely 

 ash}''), with widely luniform chestnut tessellations above and 

 radiating striae below, suture deep ; whorls 4-J-, convex, rather 

 rapidly increasing, the last a little planulate and declining above, 

 base convex ; peristome sinuous, upper margin receding. 



Diam. 3 - 5 mill. 



Rarotonga, Cook^s Is. 

 H. RUDIS, Garrett. PL 8, figs. 44-46. 



Moderately, deeply umbilicated, thin, subpellucid, lightly 

 laminately costate, costse rude, sinuous, more or less irregular, 

 or partially deficient, the interstices very lightly finely striated 

 corneous, occasionally brownish or blackish brown, with or 



