PLATE :38. 



Page 



Fig. 1-7. Leptoc(elia concava. 245 



1 a, b, c, d. and 2 a.^ b. c. Dorsal, ventral, profile, and front views of this species. 



2 d. Knlargement of the beak of the dorsal valve, showing the foramen and false area. 



3 & 4. Specimens with a more extended hinge-lino, and which present some slight ditforoiicos 



in the striae. 

 o & 6. Interior of a small and of a large ventral valve. 

 7. The ventral valve enlarged. 



Fig. 8 - 13. Leptoccei lA imbbicata. 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 fiom the more common forms. 

 13. Dorsal view of a specimen much enlarged. 



Fig. 14 - 20. Eatonia singulabis. 243 



14-16. 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 o, b. Ventral and dorsal views of a cast of this species. 

 20. Enlargement of the surface stria;. 



Fig. 21 - 26. Eatonia peculiabis. 244 



21 . Illustration of one of the shorter forms of this species. 



22 a, 6. 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 dent icnlat ions in front. 



24 a, b, c. Profile, ventral, and front views of a siJeciraen which shows more distinctly the 



denticulations in front. 



25 a, ft. Ventral and dorsal views of a east of this species. 

 26. Enlargement of the surface stria;. 



