EXPLANATION OF PLATE LIV. 



DlANCHORA ECHINATA (Morton), p. 487 



1. The interior of a lower valve attached to the inside of a 



Gryphaea shell. 



2. View of the hinge extremity of an individual attached to the 

 y- interior of a Gryphaea shell, showing the convex outline 



of the cast of the upper valve. 

 Navesink marl. 



LIMA RETICULATA (Lyell and Forbes), p. 492 



3. A right valve preserving the shell. 



Marshalltown clay-marl; near Swedesboro, (177). 



4. The internal cast of a right valve. 



Navesink marl; near Walnford, (149). 



LIMA LORILLARDENSIS n. sp., p. 492 



5. The left side of a crushed internal cast. 



6. Squeeze from the impression of the exterior of the same. 



Woodbury clay; Lorillard, (102). 



LIMA PELAGICA (Morton), p. 489 



7. A nearly complete left valve. 



Navesink marl; near Walnford, (147*). 

 LIMA WHITEIELDI n. sp., p. 491 



8. A very perfect right valve, illustrated by Whitfield as Radula 



pelagica. 



Navesink marl; near Holmdel. 

 LIMA MONMOUTHENSIS (Whitfield), p. 494 



9. View of the type specimen, illustrated by Whitfield as Nucula 



monmouthensis. 



Wenonah sand; Marlboro. 

 PLAGIOSTOMA ERECTA (Whitfield), P- 495 



10. View of a right valve preserving the shell. 



Marshalltown clay-marl; near Swedesboro, {177). 

 ANOMIA ARGENTARIA Morton, p. 496 



11. A cast of the interior of the upper valve. 



Cliffwood clay; Cliffwood Point, (105}. 



12. A specimen retaining the shell. Illustrated by Whitfield. 



Navesink marl; Freehold. 



13-14. Two views of a complete internal cast, the lower side showing 

 the position of the perforation of the valve. 



Merchantville clay-marl; Lenola, (163). 



15. A group of specimens, retaining the shells. Illustrated by 

 Whitfield as A. tellinoides. 



Navesink marl; Freehold. 



ANOMIA RADIATA n. sp., . . .- p. 499 



16-17. Two views of the type specimen, a nearly complete internal 

 cast. The view of the under side shows the position of 

 the perforation of the valve. 



Woodbury clay; Lorillard, (102). 



990 



