THE LOWER EMBAR OF WYOMING 663 



PLATE III 



Figs. i-^.—Campodus corrugatus N. and W.: specimen figured by Traut- 

 schold as the holotype of Chiastodus obvallatus; X 1 ; found in the Moscowian 

 of Mjatschkowa, Russia. 



Figs. 4-6. — Campodus corrugatus N. and W.: found in the Upper Coal 

 Measures above coal No. 5, Galatea, Illinois; X3/4. 



Figs. 7-8. — Nucula pulchella Beede and Rodgers; found in the Embar, 

 Big Popo Agie Canyon, Wyoming; lateral views of two specimens; X4/3 

 (No. 751). 



Figs. 9-12. — Leda bellistriata Stevens: found in the Embar, Big Popo 

 Agie Canyon, Wyoming; Figs. 9-11, lateral views of casts; Fig. 12, hinge 

 line of a cast; X4/3 (No. 722). 



Fig. 13. — Plagioglypta canna White: found in the Embar, Big Popo 

 Agie Canyon, Wyoming; view of imperfect specimen; X4/3 (No. 726). 



Figs. 14-15. — Pleurophorus sp?: found in the Embar, Big Popo Agie 

 Canyon, Wyoming; lateral views of two nearly perfect casts; X4/3 (No. 727). 



Figs. 16-17. — Better ophon bellus Keyes: found in the Embar, Big Popo 

 Agie Canyon, Wyoming; Fig. 16, dorsal aspect; Fig. 17, lateral aspect; X4/3 

 (No. 723). 



Figs. 18-19. — Nucula perumbonata White: found in the Embar, Big 

 Popo Agie Canyon, Wyoming; Fig. 18, dorsal aspect; Fig. 19, lateral aspect; 

 X4/3 (No. 725). 



Figs. 20-21. — Nucula sp?: found in the Embar, Big Popo Agie Canyon, 

 Wyoming; Fig. 20, lateral aspect of a cast; Fig. 21, dorsal aspect of a cast; 

 X4/3 (No. 724). 



Figs. 22-25. — Orbiculoidea utahensis Meek: found in the Embar, Big 

 Popo Agie Canyon and Little Popo Agie Canyon, Wyoming; Fig. 22, lateral 

 view of brachial valve, X3/2; Fig. 23, outer surface of pedicle valve, X7/5; 

 Fig. 24, inner surface of pedicle valve, X3/2; Fig. 25, brachial valve; X4/3 

 (No. 750). 



PLATE IV 



Fig. i. — Eunemacanthus keytei Branson: lateral view of holotype, X9/10; 

 found in the Embar, Big POpo Agie Canyon, Wyoming (No. 711). 



Fig. 2. — -Ctenacanthus obscuracostatus: Branson lateral view of holotype, 

 X7/8; found in Big Popo Agie Canyon, Wyoming (No. 710). 



Figs. 3-6. — Batacanthus gigas Branson: Fig. 3, lateral view of imperfect 

 spine, X1/2; Figs. 4 and 5, top views of spine denticles, X3; Fig. 6, sur- 

 face ornamentation; X2 (No. 715). 



Fig. 7. — Ctenacanthus browni Branson: lateral view of type, X 4/5; found 

 in Big Popo Agie Canyon, Wyoming (No. 709). 



Fig. 8. — Unidentified cochliodont: top view of outer end of tooth, X3/4; 

 found in Big Popo Agie Canyon, Wyoming (No. 714). 



