EXPLANATION OF PLATE LXXIII. 



PANOPEA ELUPTICA Whitfield, p. 647 



1-2. Lateral and cardinal views of a nearly complete internal cast. 

 Manasquan marl; Medford. 



PANOPEA DECISA Conrad, p. 646 



3. Lateral view of an internal cast. 



Merchantville clay-marl; near Mataivan, (/oi). 



4. View of an internal cast of a right valve. 



Wenonah sand; near Marlboro, (/jo). 



5. Lateral view of a small internal cast. 



Navesink marl; near Crawfords Corner, (/.?6 7 ). 



RANGIA ? TENUIDENS (Whitfield), : p. 635 



6. Lateral view of one of the type specimens. 



7-8. Lateral and anterior views of another of the type specimens. 

 Raritan clay; near Sayreville. 



GASTROCHAENA LINGUIFORMIS n. sp., p. 649 



9. Right lateral view of the type specimen preserved in the 

 cast of the tube. 



Merchantville clay-marl; near Jamesburg, (140}. 



GASTROCHAENA WHITFIEU>I n. sp., p. 648 



10-12. View of the tube, and cardinal and lateral views of the 

 included shell. 



Navesink marl; near Walnford, Bruere's pits. 



GASTROCHAENA AMERICANA Gabb, p. 649 



13. View of the cast of a tube. 



Vincentoivn limesand; New Hgypt, (143}. 



1030 



