PLATE 3—Continued. 
Page. 
Fig. 24. Crania gregaria. 29 
24. A large bivalve shell with humorous individuals of the Crania attached to its surface. There 
are also the remains of the ventral valves of C. hamiltonite, and the smaller ones are 
perhaps only the young of that species. 
Figs. 25, 26. Crania leoni?. 30 
25. The dorsal val.ve of this species. 
26. A profile of the same. 
Figs. 27-80. Crania leoni. 30 
27. Dorsal valve retaining the shell, supposed to be of this species. 
28. Profile of the same. 
29-. The cast of a dorsal ? valve of this species. 
30. The cast of a ventral ? valve of the same. 
