126 RHYTIDA. 



Unfigured Australian Species. 



R. WALKERT, Gray. Unidentified. Appears to be related to 

 R. capillacea. New Holland. 



R. LANGLEYANA, Brazier. 



Macquarie Harbor, W. coast of Tasmania. 



R. HOBSONI, Brazier. Palm Island, N. E. coast of Australia. 



R. BEDDOMEI, Brazier. Albany Island. and Cape York. 



*** 



The following New Zealand forms might well constitute a 

 distinct section or subgenus, characterized principally by the 

 malleated surface, angulated periphery and umbilicus, etc. 



R. DUNNI.E, Gray. PL 24, fig. 73. 



Umbilicated, irregularly granularty or malleately closely 

 striated ; orange-brown ; whorls 4, planulate, the last slightly 

 descending at the aperture, base flatly convex, umbilicus infun- 



dibuliform. Diam. 24, alt. 11 mill. 



New Zealand. 



Var. /9. Olivaceous brown, last whorl with five elevated close 

 spiral striae below the periphery. 



R. GREENWOODII, Gray. PL 24, fig. 74. 



Umbilicated, rather thin, rugosely and malleately striate; 

 olivaceous brown ; whorls 4, the last obtusely subangulated at 

 the periphery, with interrupted irregular spiral cord-like striae ; 

 umbilicus infundibuliform, chestnut-color. 



Diam. 23 5, alt. 12 mill. 



New Zealand. 



Is R. Gunnii, Gray (MS.). The periphery is much less angular, 

 the body-whorl and aperture much more oblique- than the pre- 

 ceding species ; differs also in its colored umbilicus. 



Unfigured Species. 



R. PATULA, R. CITRINA, R. AUSTRALis (perhaps a var. of citrina), 

 all of Hutton. New Zealand. 



