PLATE X 



Page. 

 Spondylus gregalis Morton 57 



Fig. 1. View of the upper side of a cast showing the muscular scav. From Upper Free- 

 hold, N.J. 

 2. View of the lower side of a smaller specimen. 



DiAiSXHORA ECHINATA Morton 59 



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

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



6. A young lower valve having a fragment of ioreij^n nUcII ;itf;ichc<l at the apex. 



Holmdel, N.J. 



7. View of lower valve attached to Exogura co^siata. Freehold. N. J. 



8. View of a similar valve attached to GryplKPa vesicnlariH. 



9. Cardinal view of a specimen preserving the lower valve and part of the up[)er, 



the most of the latter being internal cast. 



Paranomia scabra Morton 4 i 



Fig. 10. View of the type specimen of Dr. Morton. I have seen no entire individual valves, 

 and only a few other fragments. 



288 



