186 University Geological Survey of Kansas. 



Allorisma geinitzi, (p. 167.) 



6. Right valve of specimen. Natural size. 

 Pleurophorux tropidophorus, (p. 162.) 



7. View of right valve. Natural size. 

 Yoldia subscitula, (p. 152.) 



8. Right valve. Natural size. 

 Conocardium parrishi, (p. 161.) 



9. Left valve. (After Keyes.) 

 Allorisma granosa, (p. 168.) 



10. Left valve of specimen. Natural size. 

 Plcurophorus subcostatus, (p. 161.) 



11. Cast of left valve. (After Meek and Worthen.) 

 116. Dorsal aspect of the same. 



Allorisma costatum, (p. 170.) 



12. Right valve of specimen. Natural size. 

 Macrodon obsoletus, (p. 147.) 



13. Right valve of specimen. (After Meek.) 

 Nuculana bcllistriata, (p. 148.) 



14. Dorsal view of specimen. Natural size. 

 146. Left valve of same. 



Nucula ventrieosa, (p. 150.) 



15. Exterior view of specimen. Natural size. 

 Cyprlcardiniaf earbonaria, (p. 164.) 



16. Left valve. Natural size. 

 Cardlomorpha missouriensis, (p. 165.) 



17. Right valve. Natural size. 

 Placunopsis earbonaria, (p. 111.) 



18. Lateral view of specimen. (After Meek and Worthen.) 



PLATE XXI. 



Solenomya parallela, (p. 158.) 



1. Side view of type. 

 Solenomya trapezoides, (p. 159.) 



2a. Left valve. Anterior adductor scar and pallial line a little too strong. 



36. Dorsal view of another specimen. 

 Limopterla subalata, (p. 131.) 



3a. Side view of left valve. 



36. Side view of right valve. Both natural size. 

 Yoldia glabra, (p. 153.) 



4a. Side view of type. Natural size. 



46. Surface markings. Enlarged. 

 Nucula pulehella, (p. 151.) 



5a. Side view of type. Enlarged. 



56. End view of same. 



5e. Surface markings. Greatly enlarged. 



