224 
cordiform, and clearly separated into three nearly equal parts by two arched 
furrows originating at the beaks ; the rest of the same surface is ornamented 
with small folds, equal to each other, and parallel with the keel which serves 
to limit them. The posterior part terminates in a slightly truncated angle ; 
it gapes and its ventral margin is slightly sinuous. The surface of the valves 
is ornamented with irregular radiating ribs separated by narrow furrows. 
Dimensions . — The specimens figured by McCoy and Dana are about 
two and a half centimetres long by one and a half broad. 
Delations and Differences . — This species differs from G. aliformis, 
Sowerby, by the keel limiting its anterior surface and by the division of its 
surface into three distinct parts ; its ribs are also thinner and more numerous. 
Horizon and Localities . — I cannot confidently assert that this small 
specimen of Conocardimn really belongs to the s^iecies defined by McCoy and 
Dana in which I have placed it. This specimen was found in a railway 
cutting between Maitland and Stony Creek. Dana found this species at 
Glen don. 
Gewws— TELLINOMYA, J. Hall. 
Tellinomya Dahwini, L. G. de Koninch} 
PL XVI, Fig. 9. 
This shell is rather large for the genus to which it belongs. It is 
pyriform, gibbous, and onc-third longer than broad. Its anterior side is 
rounded and sub-semielliptical, its posterior side rather elongated and pointed. 
The beaks are rather thick and situated on the anterior third of the valves. 
The posterior hinge line is concave, while the anterior is convex. Its lunule 
is small. The whole surface is ornamented with thin, concentric, sharp- 
pointed, equally tliick ribs, separated by deep furrows a little broader than 
the ribs and rounded at the bottom. The structure of the hinge is unknown 
to me. 
Dimensions . — The length is twenty-tAvo, breadth fifteen, and thickness 
eleven millimetres. 
' [NuculmM Darwird, Vide E, Etheridge, Jiinr., Ann. Rent. Dept. Mines N. S. AVales foi’ 1887 [1888], 
p. 168.— W.S.IX] 
