124 RHYTIDA. 



lated above, pellucid ; light chestnut-colored ; whorls 5, the last 

 not descending in front, lightly radiatety striated around the 

 umbilicus. Diam. 22, alt. 12 mill. 



Port Lincoln, Australia. 



Something like R. Slrangei, but smaller, with more transverse 

 aperture and narrower umbilicus, and without revolving sculp- 

 ture. 



R. LAMPROIDES, Cox. PI. 23, fig. 51. 



Umbilicated, thin, closely irregularly ribbed-striate ; reddish 

 corneous, scarcely shining, lighter and more polished below ; 

 whorls 4, rapidly increasing, the last not descending, depressed 

 above, more convex below, the periphery subangulated. 



Diam. 14, alt. 5'5 mill. 



Tasmania. 

 R BULLACEA, Pfr. PI. 22, figs. 25, 26, 24. 



Umbilicated, thin, glossy, pellucid, above closely filiformly 

 striate ; reddish, horny ; whorls 4, rapidly increasing, the last 

 slightly depressed above, but not descending at the mouth, base 

 convex, very faintly radiately striated, yellowish horny, very 

 glossy. Diam. 17*5, alt. 6*25 mill. 



Clarence and Richmond Rivers, Australia. 



Dr. Cox, with some doubt, refers his H. assimilis to this 

 species as a synonym. Fig. 24, figured by Reeve from the type 

 in the Cumingian collection, shows strigations which are not 

 mentioned in Pfeiffer's description made from the same shell, 

 nor do they exist in Dr. Cox's specimens. 



R. SHERIDANI, Brazier. PI. 22, figs. 14, 15. 



Umbilicated, thin, closely finely obliquely striated above; 



reddish chestnut; whorls 4^, the last large, flattened at the 



suture, base convex, slightly striate, more conspicuously so in 



the umbilicus ; aperture bluish within. Diam. 28, alt. 16'6 mill. 



Cardwell, Rockingham Bay, N. E. Australia. 



R. NAMOIENSIS, Cox. PL 22, figs. 19, 20. 



Profoundly, rather narrowly Umbilicated, thin, transparent, 

 everywhere smooth, shining; light olive-brown; whorls 5, the 

 last not descending ; aperture opalescent within. 



Diam. -93, alt. -53 inch. 



Namoi River, New South Wales. 



