PLATE 38. 
Page 
Fig. 1-7. Leptoccelia concava. 245 
1 a, b, c, d, and 2 a. b, c. Dorsal, ventral, profile, and front views of this species. 
2 d. Enlargement of the beak of the dorsal valve, showing the foramen and false area. 
o & 4. Specimens with a more extended hinge-line, and which present some slight differences 
in the striae. 
5 & 6. Interior of a small and of a large ventral valve. 
7. The ventral valve enlarged. 
Fig. 8 -13. Leptoccei ia imbricata. 246 
8, 9 & 10. Illustrations of the dorsal and ventral valves of the ordinary forms of this species. 
11 &. 12. Individuals differing somewhat in the plications from the more common forms. 
13. Dorsal view of a specimen much enlarged. 
Fig. 14 - 20. Eatonia singularis. 243 
14 - 10. Ventral, dorsal, and profile views of specimens of the ordinary size. 
17 a , b, c, d. Ventral, front, cardinal, and profile views of larger individuals. 
18. Ventral valve of an unusually large species. 
19 a. b. Ventral and dorsal views of a cast of this species. 
20. Enlargement of the surface stria;. 
Fig. 21 - 20. Eatonia pecueiaris. 244 
21. Illustration of one of the shorter forms of this species. 
22 a, b . Dorsal and profile views of a specimen of the ordinary form. 
23 a, b. Dorsal and front views of a full-grown specimen, showing the denticulations in front. 
24 a, b, c. Profile, ventral, and front views of a specimen which shows more distinctly the 
denticulations in front. 
25 a, b. Ventral and dorsal views of a cast of this species. 
26. Enlargement of the surface stria;. 
