LITTORINID^, 159 



3. Risella nana. 



Trochus nana, LamarcJc, Bist. 1822, Australia ; ^= Bembicium picttim, Phil. 

 Zeits. Mai., 1846, Van Diemau's Land, fide Phil. = R. nana Quoy 

 [not Lam.']. 



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



4. Eisella lutea. 



Trochus luteus, Qmo?/, Voy. Astrol.1832, " Port du Ji oi- George " ; =zTrochus 

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



The E/ev. Tenison- Woods considers this species as a sexual 

 variety of E. plana. 



30 Pt. Jackson and Moreton Bay ,• coll. G. Nevill, Esq. 



Sub-Genus PEASIELLA, nov, 

 Typ^, Trochus tantillus, Gould. 



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

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

 to the Family Trochidcs, being concentric and multispiral, 

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

 the Grenus Risella. 



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 jparvula, Dunker, Cat. Mus. Godef. IV, 1869, Samoa. 

 1 Samoa ; ex Mus. Godeffroy. 



