PLATE A 66. 
Fig. 1. 663. 1. Cybele punctata. 
1 a. An individual nearly entire, showing the proportion of parts. 
1 b, c. The glabella and base of buckler of two individuals of different size. 
1 d. The cheek separated at the facial suture. 
1 e. Profile of glabella, showing the strong indentations at the base. 
1 f. An enlarged portion, showing the prominent tubercles. 
1 g, h. The caudal shields (imperfect at the extremities) of two individuals. 
1 i. A small individual. 
1 k. An enlargement of several articulations of the caudal shield. 
I l. The surface magnified, showing pustules of different size. 
(Pag. 297.) 
Fig. 2. 665. 3. Acidaspis - {Species undetermined). (Pag.299.) 
Fig. 3. 666. 3. Phacops trisulcatus. (Pag. GOO.) 
3 a. The individual of the natural size. 
3 b. Enlargement of the buckler, several ribs of the body, and the caudal shield. 
Fig. 4. 667. 5. Ceraurus insignis. (Pag. 300.) 
Fig. 5. 664. 5. Calymene clintoni. 
5 a. An individual having the cheeks partially separated at the sutures, and crushed. 
6 b. A profile view of the same. 
5 c. A cheek of a larger individual separated from the buckler. 
5 d. A caudal shield of a large individual in the iron ore. 
(Pag. 298.) 
Fig. 6. 293. 2. Calymene blumenbachif, var.? senaria. (Pag. 299.) 
6 a. An individual of large size, much expanded laterally. 
6 b. The caudal extremity of the same, of remarkably large dimensions. 
6 c. The glabella of the same. C d, e. The caudal extremities of two individuals. 
Fig. 
7. 
Fragments of Homalonotus delphinocephalus. 
(Pag. 299.) 
Fig. 8. 
Fragments of Phacops limulurus. 
(Pag. 299.) 
Fig. 9. 669. 1. Bumastis barriensis. (Pag. 299.) 
9 a. The central portion of the cephalic shield, from shaly limestone of the Clinton group. 
9 b. Front view of the same, showing the elevation. 
9 c. The caudal shield of another individual. 9 d. View showing the convexity of the same. 
9 e. Section of a fragment of limestone, which is mainly composed of the cephalic and caudal shields of this 
trilobite. 
9 /. Magnified view of a weathered portion of one of these shields. 
Fig. 10. 668. 1. Beyrichia lata. 
(Pag. 301.) 
10 a. A fragment of ferruginous slate, covered with the separate valves of this fossil. 
10 b. A valve having a subcentral depression. 
10 c. A valve with a subcentral lobe or nucleus. 
10 d, e. The interior of the shell, or impression made by the cast. 
