PLATE XLV. 



Pios. 



1. Cyphoderia trochus var. palustris Penard. (p. 81) 

 After Cash, x 300. 

 2-6. C. ampulla (Ehrenb.) Leidy. (p. 70) Pig. 3.— An 

 encysted individual. Figs. 2 and 5. — Side and oral 

 views of active individuals. Fig. 4. — Oral view of 

 an abnormally shaped individual. Fig. 6. — Two 

 individuals in conjunction. All after Cash, x 300. 



