41 



broad slightly raised squamose radiating ribs, sunnounted 

 by a smaller ridge of distant lamellose spines ; breadth of 

 interspaces and rays equal ; rays finer and closer together 

 as they approach slope. Long. 50mil., lat. 35mil., alt. (both 

 valves) 26niil. Eare, Table Cape. 



Crossea labiata, Ten. ^\oods. 



This shell has recently been discovered fossil in the Table 

 Cape beds, by Mr. T. R. Atkinson. I have also discovered 

 another specimen in a box of loose material which was 

 brought from the cliffs at Table Cape by the same careful 

 observer. The fossil species is larger than the living species. 



Aeca trapezia, DesJiayes. 



This shell was also found fossil in the Table Cape bed by 

 myself three years ago. The specimen was given to Mr. 

 Woods, but he has omitted to refer to it. It is probably now 

 in the Museum. I have fortunately taken a careful drawing 

 of the specimen. 



Pectunculxjs laticostatus, Qtioy and Gaimard. 



Professor McCoy, in the " Second Decade Yic. O.E." has 

 figured and described this shell, in which he states that it 

 agrees in all respects with Quoy and Gaimard' s original 

 description of P. laticostatus. The surface of the Table 

 Cape species differs, however, in having invariably 29 radial 

 ribs — not 39, as in Professor McCoy's beautifully executed 

 figure, and as stated in original descrij^tion. A specimen 

 obtained by me from Schnapper Point also shows 29 radial 

 ribs. If there is no error in description (in p. 26, Decade 

 II, Geol. Surv. of Vic), and if the difference is a permanent 

 and specific one, I would propose the name Pedunculus 

 McCoyi, for the Table Cape variety. In all other respects it 

 answers Quoy and Gaimard's description. 



Amusium Atkinsoni, n.s. 



Shell very minute ; equi valve suborbicular ; ears unequal ; 

 dorsal and ventral surface slightly convex, and composed of 

 a distinct layer densely regularly concentrically striated, 

 frequently detached partly from inner smooth layer ; inside 

 of both valves concave, shallow, shining, with 10 smooth 

 raised radiating riblets, which terminate truncately near 

 margin ; riblets not raised on dorsal or ventral surface, 

 although they may be traced by faint dark pellucid lines. 

 Long. 4, lat. 4. Rare, Table Cape. 



