LITTOJRINID^, 159 



3. Risella nana. 



Trochus nana, LamarcJc, Hist. 1822, Australia ; ^^ Bembicium pictum, Phil. 

 Zeits. 3Ial., 1S46, Van Dieman's Land, fide Phil. = R. nana Quoy 

 [_not Lam.'\. 



4 Tasmania ; ex c. G. Nevill, Esq. 



4. Risella lutea. 



Trochus luteus, <2(«o;/, Voi/. Astrol. 1SS2, " Port du Tloi- George" ; =Trochus 

 cicatrosus, Jonas, Phil. Abb. 1843, Port Western. 



The "Rev. Tenison-Woods considers this species as a sexual 

 variety of B. plana. 



30 rt. Jackson and Moreton Bay j coll. G. Nevill, Esq. 



Sub-Genus PEASIELLA, nov. 



Ti/pe, Trochus tantillus, Gould. 



E. A. Smith in the Journal, Linncean Soc, XII, 1876, p. 552, 

 describes the operculum of R. tantilla as " truly appertaining " 

 to the Family TrocliiclcB, being concentric and multispiral, 

 but that for other reasons he considers it should be located with 

 the Genus Bisella. 



A species from the Loyalty Islands has been described by 

 Montrouzier, J. de C., 1879, as " Echinella gaidei, long. 3|-, 

 diam. 4^ mil." ; apparently this must be a close ally of the 

 Andaman form. I have named this new group in honour of 

 the late Harper Pease, Esq. ; it is easily distinguished by the 

 perforate or umbilicate base, &c. 



5. Risella [Peasiella] tantillus. 



Trochus tantillus, Gould, P. Bost., S. Ill, 1849, Sandwich Islands. 



20 Sandwich Islands ; coll. H. Pease, Esq., Dr. H. Dohrn, and Prof. 

 W. Newcomb. 



var. parvula. 



Eisella parvula, DunTcer, Cat. Mus. Oodef. IV, 1869, Samoa. 

 1 Samoa ; ex Mus. GodefEroy. 



