39 



Centiiria qiiarta Teslaceoriim novorum^ 



auctore R. A. Philippi. 



(Confin.) 



29. Risella flavescens Ph. 



R. testa elevato-conica , lutescente, transversim argutesul- 

 cata, sulcis circa 5, oblique plicata; anfracfibus pla- 

 nis, margine basali prominulis; basi convexiuscula, 

 sulcis concentricis sex exarata; columella palatoque 

 rufo-fiilvis , faucibus, quoad labro respondent, nigris. 

 Alt. 4'/3"'; diam. 5'". 

 Patria: Insula Norfolk. Vidi in coli. cl. Hanley. 



Testa conica, obtusiuscula, satis solida. Anfractus 

 Septem, omnino plani, ultimus satis acute angulatus, pen- 

 ultimus margine basali prominens; basis convexiuscula. 

 Plicae obliquae striis incrementi parallelae confertae in 

 anfractu ultimo evanescentes. Sulci transversi profundi 

 interstitiis elevafis rotundatis aequales 5 — 6 testam secant 

 et scabram reddunt; duo superiores magis a sutura et 

 inter se distant. Sulci laeviores latiores, minus profundi 

 basin exarant. Apertura depressa, rhomboidea, columella 

 arcuata, dilatata, plana superius suico semicirculari cincta. 

 (Jolor flavescens immaculatus; columella et pars palatalis 

 aperturae rufo-fulvae, pars labro correspondens nigra, 

 pars basalis extus alba. 



30. Risella plicatula Fh. 



R. tesia elevato-conica, rufescente, transversim obsolete 

 striata; anfractibus planis versus basin conferte et 

 oblique plicatis, ultimo acute angulato, margine un- 

 dulato; basi plana, cingulis concentricis sex sculpta; 

 apertura fulva. Alt. ^V^'", diam. SVa- 



Patria: Insula Norfolk. Vidi in coli. cl. Ilanley. 



