FIGS. 1. 
3,4. 
10. 
11. 
380 
EXPLANATION OF PLATE XII. 
AMMONITES (PLACENTACERAS) PLACENTA, De Kay (p. 255). 
Outline of a septum, natural size, from near the onter part of the specimen figured on 
Pl. xL, but from the opposite side. 
. View of a small specimen from near Freehold, showing the umbilicus and the lines of 
nodes at its outer margin. 
AMMONITES DENTATO-CARINATUS Roem. (p. 250). 
Two views of the only fragment of the species known from New Jersey. Acad. Nat. Sci., 
Phila. 
AMMONITES COMPLEXUS Hall & Meek (p. 249). 
. Lateral and dorsal views of the only fragment seen from within the State. Acad. Nat. 
Sci., Phila. 
. Diagram of a septum as far as it can be traced. 
AMMONITES (SPHENODISCUS) LENTICULARIS Owen (p. 258). 
. View of a fragment from near the umbilicus, representing parts of several chambers of a 
rather large specimen. 
. View of another fragment from near the dorsal margin of 2 large specimen. These two 
are all I have seen of the species from New Jersey. 
AMMONITES (PLACENTACERAS) TILIFER Morton (p. 257). 
View of the fragment figured by Dr. Morton in his Synopsis. 
View of a larger fragment, also from Dr. Morton’s collection, showing the dorsal line. 
