Je yy OX OCI 
PLACENTICERAS. 
Page. 
GSMs) 2m LCentCencsKimten Calan ciyan aCOSt ELI e lelay (et tees a 207 
Figs. 1, 2. Aperture yiew and suture of specimen represented by Pl. XX XVIII, 
fig. 2: . 
RIGS 3—OmePlacenpicenas ola certo (CD e kiya) Nessa eset sere ar ae 211 
Fig. 3. Fragment of a small specimen from Chesapeake and Delaware Canal, 
Coll. Acad. Nat. Sci. Phila. 
+. Suture of same, 2. 
5. Side view of small specimen from Lenola, N. J. 
6, Sutures from smaller end of volution represented by fig. 5 enlarged four 
diameters (see Pl. XL, figs. 1, 2). 
Matawan (?) formation, Upper Cretaceous. . 
330 
