PLATE XVII. 
Actinopteria muricata. 
Page 108. 
Fig. 1. A small left valve showing- the extent of the wing, X 2. The surface of the wing should show 
several fine radii. 
Fig. 2. A larger left valve, X 2. The extremity of the wing is not sufficiently extended in the figure, and 
the surface has fine radii which are not represented. 
Fig-. 3. A left valve preserving the mueronate extensions of the radii along the ventral margin, X 2. 
Max-cellus shale. Littleville, Livingston Co., N. Y. 
Actinopteria Doris. 
Page 109. 
Fig. 4. A left valve of this species, enlarged to two diameters. 
Marcellas shale. East Bloomfield, N. Y. 
Leiopteria l.eyis. 
Page 158. 
' See Plate 20. 
Figs. 5, 6. Two right valves, X 2. Fig. 6 is incorrectly restored on the ventral margin and the wing. 
Figs. 7-11. Left valves showing the prevailing characters of the species, X 2. 
Marcellus shale. Livingston and Errie counties, N. Y. 
Leptodesma Marcellense. 
Fig, 
12. The left valve described, X 2. 
Marcellus shale. 
Page 175. 
East Bloomfield, N. 
Y. 
Pterinopecten Hermes. 
Page 64. 
Fig. 13. A small left valve. The extremity of the ear is represented too acute and the pallial margin is 
reflexed in the specimen. 
Hamilton group. Canandaigua lake, N. Y. 
Fig. 14. A larger left valve. 
Hamilton group. Ontario Co., N. Y. 
Fig. 15. The interior of a left valve. 
Hamilton group. Canandaigua lake, X. Y. 
