PLATE XXIII. 
Eurydesma cordatuin, Morris. 
\. Right valve of a lai’ge specimen, partly testiferous, but with a less marked external 
inequality of the valves. 
2. Testiferous umbonal region and articulus of a right valve exhibiting a large resilium, 
Freeh’s smooth space, hyssal sinus, and horizontally projecting cardinal fold. 
3. Right valve of a young shell (reproduction of the type of E. glohosa, Dana in Wilkes — 
U.S. Explor. Exped., GeoL, X, PI. VII, fig. 7). 
4. United valves of Fig. 3, anterior view (Dana in Wilkes, loc. cit., fig. 7a). 
Eurydesma hobartense, Johnston. 
5. Portion of a testiferous left valve (see PI. XX, fig. 6 ; PI. XXI f, fig. 2.) 
Localities. 
Fig- 
1 . 
Maria Island, Tasmania. 
Fig. 
2 . 
>> 5 ; 
Figs. 3, 
4. 
Harper’s Hill, near West Maitland. 
Fig. 
5. 
Maria Island, Tasmania. 
