EXPLANATION OF PLATE LXXIIL 



Panopea )• i.liptica Whitfield, p. 647 



i-J. Lateral ami cardinal views of a nearly complete internal cast. 

 Munasiiiiaii marl; Mcdford. 



Panupea imXisa Conrad p. 646 



3. Lateral \ie\v of an niternal ca^t. 



McrcliaiitziUc clay-iiiai-I : near Malawaii, (loi). 



4, A'icw of an internal cast of a right valve. 



U'ciioiiah sand; near Marlboro, {13CJ). 

 ,T. Lateral view of a small internal cast. 



A'az'esink marl; iieai' Crazcfurds Corner, (126'). 



Raxgia ? TEXUinExs (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 elay; near Sayrez'ille. 



Gastrocu.\exa EixcutEORMis n. sp., p. 649 



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

 cast of the tuhe. 



Merchaiilzille elay-marl ; near Jamesburg, (140). 



Gastrociiaena whiteieldi n. sp p. 648 



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

 included shell. 



Ahrvesiiil: mail; near Il'alnford, Brnere's pits. 



Gastrociiaena american.\ Gabb, p. 649 



13. \'iew of the cast of a tube. 



I 'liieeutozon limesand; Nezu Egypt, {i-is)- 



1030 



