EXPLANATION OF PLATE XXIV. 



Fig's 76 A and B. — Anodonta Danielsii Lea 9, Lost Cr., Amity. 

 Fig's 77 A and B. — A. dakotana Frierson 9, L. Contrary, St. Joseph. 

 Fig's 78 A and B. — Alasmidonia marginata Say 9, Gasconade R 

 Gascondy. 



Fig's 79 A and B. — A. calceolus (Lea) 9, Jack's Fork, Current R. 

 Fig's 79 C and D. — A. calceolus, cf, White R., Branson. 

 Fig's 80 A and B. — Strophitus edentulus (vSay) 9 , Osage R., Linn Cr 

 Fig's 80 C and-D. — S. edentulus cf. White R., Branson. 



