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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. rcilcyi. 

 Navesink marl; Hohndcl. 



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

 another individual. 



Narcsink 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. 



MarsJialltown clay-marl; near Swedesboro, (177}. 

 n. Lateral view of a specimen illustrated by Whitfield partially 

 preserving the external characters. 

 Navesink marl. 



1058 



