PLATH XY. 
PAGE. 
PRONLUS BREVISARGIN AT US Qs) SDaenterdiier ens oieietanctaniens actors 197 
2 
ug 
= 
. Dorsal view of a nearly complete cranidium. Jackson- 
burg, Locality 174A. (x2). 
. Dorsal view of the same. Natural size. 
Lateral view of the same in outline. (x2). 
. A nearly complete free cheek. Jacksonburg, Locality 
TA (oe Pe 
. A complete pygidium. Same locality. (x2). 
. The same in outline. Natural size. 
. Restoration in outline of the complete head. (x2). 
a oo DO 
a1 Ol 
CYPEFASPIS/ | TRENTONENSIS) Ds | SP cies aenereaeie eerie 19 
Le 
Fig. 8. Dorsal view of a nearly complete cranidium. Jackson- 
burg, Locality 174 A.° 
9. The same in outline. Natural size. 
10. Lateral view of the same in outline. (x2). 
ARGHSETUBERCULATUS Ts. Sa. - he eee Cen 199 
Fig. 11. Dorsal view in outline of a nearly complete cranidium. 
Near Iliff’s Pond, Locality 137_A.* 
12. Dorsal view of the same. (x2). 
13. Anterior view of the same. (x2). 
BRONTEUS LUNATUS: Dill knee nee eee econo 198 
Fig. 14. A large, incomplete pygidium. Sulphur Springs, Mo. 
Pal. Coll. Walker Museum, University of Chicago, 
No. 5,879. 
15. A small, but complete pygidium. Jacksonburg, Locality 
LVL A. 
16. A complete individual (after Billings). 
PLATYMETOPUS TRENTONENSIS (Con.)................. 200 
Figs. 17-19. Dorsal, anterior and lateral views of a nearly complete 
eranidium. Drake’s Pond, near Newton, Locality 
136 B. 
20. An hypostome which possibly belongs to this species. 
Jacksonburg, Locality 1744. 
ODONTOPEEURAY PAR VUI Als OWialen) steele eietsiepeieien iyo 201 
Fig. 21. Dorsal view of a nearly complete cranidium. Jackson- 
burg, Locality 174. (x2). 
22. Lateral view of the same in outline. (x2). 
CALYMENE SENARTAY Conte enna coat iiceoeneiaat 203 
Fig. 23. Posterior view of a complete pygidium. Jacksonburg, 
Locality 174 A. 
(409) 
