PLATE LII. 
(Figures 1-15 by G. B. Simpson; 16-19 by E. Emmons; 20-36 copies.) 
Genus CLINTONELLA. gen. nov. 
Page 1.69. 
Clintonella VAGABUNDA, S}). IIOV. 
Fig. 1. A dorsal view of an internal cast retaining the shell on the umbo of the pedicle-valve. Below the 
foramen is seen a portion of the lower surface of the hinge-plate. 
Fig. 2. A view of another specimen similarly preserved, though the hinge-plate is wholly removed. 
Fig. 3. A profile of the same specimen ; showing the normal convexity of the valves and the elevation of 
the median fold on the brachial valve. 
Fig. 4. A ventral view of the same specimen ; showing the depth of the median sinus. 
Fig. 5. The interior of an imperfect pedicle-valve ; showing the teeth and open delthyrium. X 2. 
Fig. 6. The interior of a pedicle-valve ; showing the elevation and curvature of the teeth. X 2. 
Fig. 7. The interior of the umbonal portion of the brachial valve; showing the divided hinge-plate and 
the low median ridge. X 3. 
Fig. 8. An internal cast of a pedicle-valve ; showing the muscular area crossed by the plications of the 
shell. X 2. 
Fig. 9. The interior of the umbonal region of conjoined valves, viewed from in front; showing the mode 
of articulation and the bilobed cardinal process. X 3. 
Fig. 10. A cast of the interior of the pedicle-valve; showing the division of the muscular area into adduc¬ 
tor and diductor scars. X 2. 
Fig. 11. An incomplete interior of the bi'achial valve ; showing the hinge-plate and muscular scars. X 2. 
Clinton group. Drift of Western New York. 
Genus CCELOSPIRA, Hall. 
Page 131. 
CCELOSPIKA PLICATULA, Hall. 
See Plate 53. 
Figs. 12-14. Ventral, profile and dorsal views of the exterior; showing contour and character of plication. 
Clinton group. LockportfN. Y. 
CCELOSPIRA PLANOCONVEXA, Hall. 
See Plate 53. 
Fig. 15. The interior of a pedicle-valve. X H. 
Clinton gi'oup. Hamilton, Ontario. 
CcELOSPiRA (cf.) iiEMisPHdSRicA, Sowevby. 
Fig. 16. The interior of a pedicle-valve. X 3. 
Clinton group. Near Wolcott, N. Y. 
Genus ANOPLOTHECA, Sandberger. 
Page 129. 
Anoplotheca lepida, Goldfuss. 
Figs. 17, 18. Dorsal and profile views of an average specimen ; showing the slightly concavo-convex contour, 
the low, sparse plications and fine concentric lineation. X 5. 
Fig. 19. A portion of the intei-ior of a pedicle-valve ; showing the teeth resting upon the thickened shell- 
wall, and the median septum grooved for the reception of the extremity of the loop. 
Middle Devonian. Gerolstein, Eifel. 
