EXPLANATION OF PLATE LXXXVII. 



PYROPSIS TROCHIFORMIS (Tuomey), p. 746 



1-3. Two lateral views and a vertical view of a specimen illus- 

 trated by Whitfield as P. rcileyi. 

 Navesink marl; Hohndel. 



4-6. Two lateral views of one specimen and a vertical view of 

 another individual. 



Navesink marl; Mullica Hill, (169). 



7-9. Two lateral views and a vertical view of a specimen illus- 

 trated by Whitfield as P. richardsoni. 



Navesink marl; Monmouth County. 



10. Lateral view of a specimen partially preserving the shell. 



Marshalltown clay-marl; near Swedesboro, (777). 



11. Lateral view of a specimen illustrated by Whitfield partially 



preserving the external characters. 

 Navesink marl. 



1058 



