190 Gatlif and Gabriel: 



possession of radial sculpture and much sharper lamellae. One 

 valve exceeds the type measuring 11 x 10 mm. Dedicated to 

 the esteemed Tasmanian conchologist, Mr. W. L. May. 

 Type in Mr. C. J. Gabriel's collection. 



Edentteilina, n. J.,^ 



Shell small, tlattened, broadly ovate. ineq\iilateral. po.sterior 

 .side longer and broader, hinge-line short, without teeth. Shin- 

 ing outside, and inside vitreous. Thin and fragile. Right valve 

 only has an incurved projection of a rounded form just over the 

 umbone, and directed to the front ; it overlaps the left valve. 



Type E. ti/jjica, Gatliti' and Gabriel. 



Edentteilina typica, sp. nov. (PI. XLVL, Figs. 5-6). 



Shell small, flattened, broadly ovate, very inequilateral, pos- 

 terior side lono-er and broader. Slio-htlv convex. Translucent, 

 yellow. Slight irregular concentric sculpture. Posterior side 

 somewhat swollen, dorsal margin arched. Shining outside and 

 vitreous inside. Thin and fragile. The right valve only has an 

 incurved projection of a rounded form proceeding from the 

 umbone, it forms a coil, and overlaps the left valve. Ventral 

 margin nearly straight. Hinge line short, without teeth. 



Dimensions of Type. — Ant. post, diameter, 3. ; dorso-ventral 

 diameter 1.9 mm. 



Locality. — Portsea, Port Phillip, (type) Ocean Beach. Point 

 Nepean ; Shoreham. 



Ohs. — We have not yet obtained the species in pairs, valves 

 of similar dimensions being utilised as the type. We have 

 obtained odd valves from other localities on our coast, during 

 a period extending over more than ten years, some being of 

 about twice the dimensions of the type, but in poorer condition. 



Another species of the genus has been dredged off Hope 

 Island, North Queensland, by Mr. C. Hedley. It is larger, 

 broader, and not so inequilateral. We refrain from describmg 

 it, as Mr. Hedley desired to reserve to himself the description 

 of shells obtained during that expedition. 



Type in Mr. Gatliff's collection. 



