BY E. M JOHNSTON, F.L.S. 



72' 



'■ 



with a posterior depressed groove at the suture, produc- 

 ing a contraction at the hind part of the outer lip ; 

 operculum with apical nucleus. The sub-genus 

 Josepha, T.- Woods, differs from Cominellain possessing 

 a plait upon the columella. JDist. — Cape, Australasia. 



Genus Ebuena. Lam. (60.) 

 Shell ovate-oblong, thick, porcellanous, under a thin 

 epidermis ; deeply umbilicated ; spire acuminated ; 

 whorls more or less convex, suture more or less 

 channeled ; columella arcuated ; callous posteriorly ; 

 aperture oval, inner lip spreading, often covering the 

 umbilicus in the adult ; outer lip simple acute ; 

 operculum with apical nucleus. Dist. — Red Sea, 

 India, Cape, Japan, China, Australasia. 



(xi.) Family Nassidje. 

 (Base of aperture with a notch or short recurved canal ; 

 inner lip callous.) 



Genus Nassa. Lam. (61-65.) 

 Shell small, ovate ; ventricose ; body whorl variously 

 sculptured ; aperture ovate, with a short, reflected, 

 truncated, anterior canal ; inner lip smooth ; often 

 widely spread over with enamel, with a posterior callosity 

 or blunt, dentiform plait ; outer lip dentated, in- 

 ternally crenulated ; margin of operculum, serrate 

 or entire. List. — World-wide. 



(xii.) Family Volutid^;. 

 Genus Voltjta. Linn. (66-72.) 

 Shell ovate or sub-conical, thick, solid ; spire usually short ; 

 (Shoulder of whorls often angulated, sometimes nodose 

 or spinous, but not so characterised in the Tasmanian 

 living species.) Aperture — extending the greater 

 length of shell — long and rather narrow ; columella with 

 a callous deposit and prominently plaited ; lip 

 generally thickened, sometimes sub-reflected. Dist. — 

 World-wide, Australia being the chief centre. 



(xiii.) Family Miteid*. 

 Genus Mitea. (73-86.) 

 shell fusiform thick ; spire elevated ; aperture small, 

 generally less than half the length of the shell, narrow, 

 notched in front ; columella transversely, somewhat 

 obliquely plicate ; outer lip thick, smooth within, not 

 variced externally. Dist. — Tropical and sub-tropical ; 

 range low water to 8'0 fathoms. 



