PLATE X. 



Spondylus grkgaus Morton 



Fig. 1. View of the upper side of a cast showing the muscular scar. From Upper Frcc- 

 hoia, N. J. 

 2. View of tlie lower side of a smaller specinieu. 



DiAKCHOR A KCHIXATA Mortou 



Figs. 3-5. Three views of a nearly entire upper valve preserving the surface structure, iiud 

 the margins of the foramen entire. Morton's type, 

 (i. A young lower valve having a fragment of foreign shell attMihcd at the .ipcx. 

 Holmdel, N.J. 



7. View of lower valve attached to Exogijra coatata. Freehold, N. J. 



8. View of a similar valve attached to Grijpham veeicularis. 



9. Cardinal view of a specimen preserving the lower valve aud part of tln^ upper, 



the most of the latter being internal cast. 



Paranomia scabra Morton 



Fig. 10. View of the type specimen of Dr. Morton. I have seen no entire individual valv(^8, 

 and only a few other fragments. 



