TRIGONARCA TRIQUETRA Conrad, ...................................... p. 402 



16. The internal cast of a right valve, showing the impression 



of the hinge. 



Cliffwood clay; Cliffwood Point, (185). 



TRIGONARCA CUFFWOODENSIS n. sp., .................................. p. 401 



17. The internal cast of a left valve, the type specimen. 



Cliffwood day; Cliffwood Point, 



TRIGONARCA CUNEIFORMIS Conrad, ................................... p. 403 



18. The internal cast of a right valve, (x2). 



Woodbury clay; near Matazvan, (/oj). 



19-20. External and internal views of a perfect right valve, (x7). 

 (After Whitfield.) 



Woodbury clay; Haddonficld, (183). 



BREVIARCA SAFFORDI (Gabb) , ........................................ p. 404 



21-24. Views of four different internal casts of single valves. 

 Woodbury clay; Lorillard, (102). 



BREVIARCA CUNEATA (Gabb) , ........................................ p. .406 



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



Woodbury clay; Lorillard, ("102). 



NEMOARCA CRETACEA Conrad, ........................................ p. 413 



25. The internal cast of a right valve. 



Woodbury clay; Lorillard, (102). 



26. The internal cast of a right valve. 



Merchantville clay-marl; near Matazvan, 



942 



