182 University Geological Survey of Kansas. 



Enteletes hemiplicata, (p. 91.) 



6. Side view of specimen. Natural size. 

 66. Front view of same. 



Puc/nax utah, (p. 93.) 



7. Brachial side, showing beak of the opposite valve, with the pedicle open- 



ing. Natural size. 

 76. Front view of same. 

 7c. Side view of same. 

 Pugnax roekymontana, (p. 92.) 



8. Side view of specimen. Natural size. 

 Sb. Front view of same. 



Meekella- striatocostata, (p. 65.) 



9. Lateral view. 

 96. Pedicle valve. 



9c. Brachial valve and hinge area. All natural size. 

 Derby a cymbula, (p. 60.) 



10. Interior view of hinge apparatus. 



PLATE XIII. 



Aviculopeeten hertzcri, (p. 121.) 



1. Left valve. 



16. Surface markings enlarged. 

 Aviculopeeten providencensis, (p. 119.) 



2. Left valve. Natural size. 

 Aviculopeeten sculpt ills, (p. 122.) 



3. Lateral view of left valve. Natural size. 

 36. End view of same. 



Aviculopeeten germanus, (p. 123.' • 



4. Left valve. Natural size. (Rogers.) 

 Lima retiferct, (p. 112.) 



5. Left valve of shell. Natural size. 

 Aviculopeeten interlineatus, (p. 116.) 



6. Left valve. Natural size. 

 Aviculopeeten occiclentalis, (p. 114.) 



7. Left valve. Natural size. 

 Aviculopeeten hertzeri, p. 121.) 



8. Right valve. (After Meek and Worthen.) 

 Aviculopeeten carboniferus, (p. 117.) 



9. Left valve. Natural size. 

 Aviculopeeten mccoyi, (p. 118.) 



10. Left valve. Natural size. 

 Pseudomonotis hawni, (p. 132.) 



11. Interior view of flat valve, showing byssal notch. 

 116. End view of convex valve. 



lie. Lateral view of convex valve. (All after Meek.) 



