PLATE XL 



TRACHYPORA AUSTINI Worthen ........................ ................... 81 



Fig. 1. Lateral view of a specimen. 



Fig. 1 a. Longitudinal section polished. 



Fig. 1 6. Transverse section polished. 



Fig. 1 c,d. Sections showing structure under the miero scope. 



ATHYKIS SQUAMOSUS Worthen .................... ....................... 103 



Fig. 2. View of dorsal side. 



RHYNCHONELLA ILLINOIENSIS Worthen ................................ 104 



Fig. 3-3 a. Dorsal and ventral views of specimen. 

 Fig. 3 b, 3 c. Front and lateral view.-) of same. 



ORTHIS RESUPINOIDES Cox .......................................... . lot! 



Fig. 4. View of ventral side. 



Fig. 4 a. Lateral view of a perfect shell. 



Fig. 4 b. View of a dorsal valve. 



SPIRIFERA MOLTIORANOSA Worthen .................................... 1 05 



Fig. 5. View of a ventral valve. 

 Fig. 5 a. Lateral view of same. 

 Fig. 5 b. Fragment of the test magnified 4,x. 



TEREBRATULA BOWLEYI Worthen ..................... .................. 102 



Fig. (>. View of ventral valve. 



Fig. C a. View of dorsal valve. 



Fig. b. Lateral view of the entire test. 



DISCIXA VARSOVIENSIS Worthen .......................................... 102 



Fig. 7. View of ventral valve. 



LlNGULA NARSOVIENSIS Worth 611 ........................................ 104 



Fig. 8. View of dorsal? valve. 



CONULAEIA CHESTEKENSIS Worthen ..................................... 133 



Fig. 9. Lateral view of a nearly perfect specimen. 

 Fig. 9 ii. Transverse section of the same. 



