30 
MESOZOIC VERTEBRATA. 
the Amphicoelian division of Crocodilia. The body of the centrum is much 
compressed. 
The other remains include a portion of a dermal bone like those 
described, and the crown of a tooth, among other fragments. This crown, 
which has lost most of its enamel, is triangular in section, and somewhat 
curved in its long axis. A convex face is directed forward and outward 
(on the supposition that the tooth is superior), and a nearly plane face pos¬ 
teriorly. The inner face is worn flat by the attrition of an opposing tooth. 
The pulp-cavity is minute or wanting. 
Typothorax coccinarum, Cope. 
Plate xxii, figs. 1-9. 
Proc. Academy Pbila., 1875, 266; Ann. Report Chief of Engineers, 1875, p. 1004. 
The pitting of the maxillary bone is not linear, and is sometimes 
round; it is rather remote. The outside of the bone is steep, indicating 
that the muzzle is not depressed. Its face is swollen opposite the supposed 
canine tooth. The alveolae are round and longitudinally oval. The alve¬ 
olar face is decurved near the end of the muzzle. The superficial layer of 
the cranial and dermal bones is dense and fine-grained. The second series 
of specimens, whose reference is by no means certain, but which contains 
a dermal bone like that of the type, includes fragments apparently of the 
iij^per surface of the cranium. This is marked with irregular tuberosities 
and excavations resembling that seen in the Belodonts of the Carolinian 
and Wiirtembergian Trias. A section of a narrow dermal bone displays an 
elevated, obtuse, median keel, the only bone which displays this form in the 
collection, the usual form being either flat or slightly concave. Accompany¬ 
ing the same, are numerous coprolites, which are apparently too small for 
an animal of the dimensions of the type-specimen. They are slender, and 
display rectal folds, which do not exhibit a continuous spiral. They are 
found, wherever fractured, to be filled with the rhomboganoid scales of some 
small fish. 
M. 
0. 095 
0. 050 
0. 045 
Length of fragment of maxillary. . 
Depth (oblique) at ? nostril. 
Depth (vertical) at ?nostril. 
Measurements. 
