PLATE XVII. 
Eurydesina cordatuni, Morris. 
A large example of the united valves, anterior view. The umbonal region of the left 
valve is seen to j^roject above that of the right ; the deep coi'date, luuular depression 
is also well disjjlayed. 
Dorsal view of the same specimen (Fig. 1), showing the closed valves. 
Locality. 
Allandale, near West Maitland. 
