PLATE XIX. 
Eurydesma cordatum, vai\ sacculum, Dana. 
1. Medium sized, cordate, testiferous right valve, exhibiting the cincture typical of the 
var. sacculum. 
2. Dorsal view of Fig, 1, showing almost equal umboncs and the valves closed along the 
cardinal margins. 
Eurydesma cordatum, Morris. 
3. Partially testiferous united valves, with the left umbonal region again projecting above 
that of the right valve. The anteriorly directed and incurved umbones, the deep 
lunular depression, and the cardinal fold of the left valve are also visible. 
4. 
5. 
Articulus of a right valve displaying the deep byssal groove in the lunular depression, 
and the scythe-shaped resilifer posterior to the umbo. 
Portion of another right articulus, with the projecting cardinal fold and other features 
seen in Fig. 4. 
Figs. 1, 2. 
Fig. 3. 
Fig. 4. 
Localities. 
Allandale, near West Maitland. 
Harper’s Hill, near West Maitland. 
Harper’s Hill, „ 
Fisj. 
5 . 
Allandale, near West Maitland. 
