^ RISSOIA. 355 



K. POLYCHROMA, Folin. PL 70, fig. 63. 



Smooth, a little shining, apex obtuse, scarcely longitudinally 

 striate, with a very minute spiral thread on the periphery; whorls 

 5, the first two with very minute quadrangular impressions, reddish, 

 yellowish or violaceous, or corneous white, with obscure darker 

 bands ; aperture subcircular, peristome simple, sharp. 



Length, 1/7 mill. 



Bay of Panama. 

 R. PULICARIA, Folin. PL 71, fig. 96. 



Very smooth, shining, white, with a series of oblong chocolate 

 spots on the periphery and spire, base with a dark band ; whorls 5, 

 subglobose, suture linear, scarcely impressed ; aperture subcircular, 

 lip simple. Length, 1/3 mill. 



Mauritius. 

 R. BRAZIERI, Tenison Woods. PL 71, fig. 97. 



Rimate, smooth, white, broadly banded with fulvous above the 

 periphery, narrowly banded below it, under an olive epidermis; 

 whorls 5, rounded, the last with sharply angulated periphery ; lip 

 sharp. Length, 3 mill. 



Tasmania. 

 R. NITENS, Dunker. PL 71, fig. 100. 



Umbilicated, smooth, shining, subpellucid, white, with two in- 

 conspicuous pale fulvous bands ; whorls 4, convex, with incised su- 

 ture, coluniella often violet tinted. Length, 1'4 mill. 



Botany Bay, Australia. 



R. ATROPURPUREA, Dunker. PL 71, fig. 1. 



Umbilicated, smooth, pellucid, polished, dark purple; whorls 4, 

 rapidly increasing, suture incised ; lip subthickened. 



Botany Bay and Sydney,^ Australia. 



R. LIMBATA, Hutton. PL 71, fig. 98. 



Narrowly Umbilicated, polished, smooth ; whorls flatly convex, 

 the last with angulated periphery ; pale olivaceous with zigzag 

 white strigations, most apparent as a sutural and a peripheral band. 



Length, 3 mill. 



New Zealand. 



Unfiyured Species Referred to Microsetia. 



R. MACILEXTA, R. PUMiLA, R. CCELATA, Monts. Mediterranean. 

 R. OCHROLEUCA, and R. FICARATIENSIS, Brugnone. Mediterranean. 



