EXPLANATION OF PLATE LV. 



MYTILUS SMOCKI n. sp., P- 502 



1-2. Two views of a complete internal cast which retains some 

 fragments of the shell. 



Navesink marl; near Walnford, (149). 

 3-4. Two views of another complete internal cast. 



Navesink marl; near Craiv fords Corner, (126*). 



MYTILUS OBLIVIUS Whitfield, p. 503 



5. The type specimen illustrated by Whitfield. 



Wenonah sand; near Marlboro. 



6. View of the internal cast of a left valve. 



Wenonah sand; near Marlboro, (130). 



7-8. Views of the internal casts of two left valves doubtfully 

 referred to this species. 



Cliff wood clay; Cliffwood Point, (105). 



MODIOLA MONMOUTHENSIS n. Sp., p. 504 



9-10. Views of two left valves. Internal casts. 



Merchantville clay-marl; near Matawan, (101). 



MODIOLA WENONAH n. sp., p. 507 



n. View of the type specimen. 



Wenonah sand; near Marlboro, (130). 



MODIOLA JULIA Lea, p. 506 



12-13. Views of two specimens, a right valve and a left valve. 

 Woodbury clay; Lorillard, (102). 



MODIOLA JOHNSONI Whitfield, p. 509 



14-15. Two views, lateral and cardinal, of the type specimen. 

 (After Whitfield.) 



Manasquan marl; Farmingdale. 



MODIOLA OVATA Gabb, p. 508 



16. Lateral view of a specimen imperfect posteriorly. (After 



Whitfield.) 



17. View of the right side of the type specimen. (After 



Whitfield.) 



Vincentown formation; Timber Creek. 



MODIOLA BURLINGTONENSIS Whitfield, p. 505 



18-19. Cardinal and lateral views of the type specimen. (After 

 Whitfield.) 



Merchantville clay-marl; Burlington. 



MODIOLA SUBINFLATA Whitfield, . . .p. 507 



20-21. Cardinal and lateral views of the type specimen, (x2). 

 (After Whitfield.) 



Hornerstown marl; near Mullica Hill. 



992 



