EXPLANATION OF PLATE XVL 



Fig's 35 A and B. — Anihlenia peruviana (Lamarck) 9, Osage R, 

 Osceola. 



Fig's 36 A and B. — A. rariplicata (Deshayes) 9, Platte R., Dixon Falls. 



Fig's 36 C and D. — A. rariplicata (Des) a', Tarkio R., Craig. 



Fig's 37 A and B. — A. perplicata (Conrad) 9 , vSt. Francis R., Greenville. 



Fig's 38 A and B. — A. perplicata Quintardi (Cragin) 9, White R., 

 Hollister. 



Fig's 38 C and D. — A. perplicata Quintardi (Cragin) 9, Osage R . 

 Froctor. 



Fig's 39 A and B. — A. plicata costata (Raf.) cf, Chariton R., Kern 



Fig's 39 C and D. — Juvenile of costata. — Same locality as adult 



