P L ^ T E 1 1 1 . 



Pago. 

 Fig. 1. Spiriper Utahensis 39 



1. Au antero-veatral view, natural size. 

 1 a. Dorsal view of same specimen. 



1 &. A side view of a smaller specimen. 



1 c. A cardinal view of another specimen, showing area and foramen. 

 1 d. Cardinal view of the ventral valve of the largest specimen seen. 

 1 e. An antero-ventral view of same. 



Fig. 2. Hemipkonites Cuemungensis, mr. aectostriata 3.5 



2. View of ventral valve, with an oblique view of area. 



Fig. 3. Spirifbr Engelmanxi 41 



3. A cardinal view, showing area and foramen. 

 3 a. A side view of same. 



3 b. Dorsal view of same. 



3 c. An antero-ventral view. 



3 d. A ventral view of another specimen apparently of this species. 



3 e. Dorsal view of last. 



Fig. 4, Spirifer argentarius 42 



4. A ventral.view. 



4 a. Cardinal view of same specimen, showing its low, strongly incurved area, foramen, 



etc. 



4 6. A dorsal view of same. 



Fig. 5. Spirifer strigosus 43 



5. View of ventral valve. 



5 a. View of dorsal valve. 



5 b. Profile view of same. 



Fig. G. Atrypa reticularis 38 



6. Ventral view. 



6 a. Dorsal view of another specimen with finer stria). 



Fig. 7. Productus subaculeatus ? 3G 



7. Ventral view. 



7 a. Ventral view of another more elongated specimen. 



7 6. A cast of the exterior of a dorsal valve of same. 



Fig. 8. POSIDONOMYA ? FRAGOSA 9-2 



8. A left valve, tiattened by pressure between the laminae of shale, with the edges 



about the beak incomplete. 



8 a. A smaller right valve flattened in the same way, and showing indications of a small 



anterior ear-like projection. 



Fig. 9. Leiorhynchus ? quadricostatgs 79 



9. An internal cast of a ventral valve, flattened by pressure. 



9 a-b. Internal casts of two dorsal valves, somewhat compressed. 



Fig. 10. AVICULOPECTEN CATACTUS 93 



10. A left valve, somewhat enlarged. 



10 a. Another left valve, natural size. 



10 &. Aright valve, apparently of this species, enlarged about two diameters; much of 

 its pallitil margin being broken away. 



Fig. 11. Spirifer (Syringothyris) cuspidatus 87 



11. A cardinal view, showing the high area and foramen, and, within the latter, the 



transverse septum and internal tube. 

 11a. Au anterior view of same. 



