EXPLANATION OF PLATE LIIL 



Spondylus gregalis { ilorton^ p. 486 



1-2. Litcnial and external views of a large lower valve iilnstrated 

 by Whit field. 

 3. View of an internal cast illustrated by Whitfield. 

 Naz'i'siiik marl; Crosswicks Creek, f 



DiANCHOKA echinata ( Morton) p. 487 



4-6. Three views of the l>T>e specimen, a nearly perfect lower 

 valve. (After \Miitficldi. 

 XoT'esiak uiai'l. 



988 



