Cope. ] ; 46 (March. 3,. 
The pegs of the costal gomphosis are absolutely twice as large, and. 
relatively still larger. J therefore believe this specimen to represent 
another species. Besides the sutural characters, those of the intergular 
scuta separate this species from Adocus beatus. In the latter that scute is 
urceolate, and the gulars sickle-shaped, being produced backwards on the: 
margins of the episternal or clavicular bones. In A. syntheticus the 
intergular is narrower. and convex behind, the mesosternum is angulate 
posteriorly, and the plastron much thicker. In A. agéids the plastron is 
nearly similar in thickness, but the mesosternum is angulate behind, and 
is narrower, and the sculpture very much coarser. 
The Z. microglypha was found by my friend, Judson Gaskill, in the- 
marl excavations under his direction, at Birmingham, N. J. 
AGOMPIIUS, Cope. 
This name is proposed for a genus of Testudinata heretofore not recog- 
nized. It appears to belong to the Emydidw so far as known, but to 
differ from them in lacking the articulation of costal and marginal bones 
by gomphosis, characteristic of the existing genera of the family. It 
does not appear to differ in any other point so far as known. The type 
species is Agomphus turgidus, Cope (Amys Trans. Amer. Phila,, 1870, 
127) ; others from the cretaceous of New Jersey are A. firmus, Leidy (1. ¢.. 
126) and A. petrosus, Cope, (1. c. 126). 
(2) PROPLEURID &, Cope. 
Séllim. Amer. Journ. Set. Arts, 1870, () 137-8. 
CATAPLEURA PONDEROSA, Cope, spec. noy. 
This turtle is represented by two posterior marginal bones, six costals, . 
a hyposternal, scapula and procoracoid, and femur and humerus, all more 
or less fractured. 
The marginals are the caudal, and adjoining one of the right side. 
They both present a suture for the pygal vertebral, and the lateral pre-- 
sents also a pit for articulation by gomphosis with the last costal bone. 
They are of heavier form than those of any other species of the group. 
The hyposternal has lad no sutural union with the hyosternal unless ex- 
teriorly ; this, if existing, has been slight. The shaft of the humerus is 
contracted and nearly cylindrical; the great trochanter of the femur is 
little elevated, and not continuous in the piane of the head, but separated, 
from it by a depression, 
The above characters express the generic relationships of this type. 
The gomphosis with the last lateral marginal, as weil as the lack of union 
of the lateral elements of the sternum separates it from Osteopygis ; their 
union is more extensive than in Propleura sopita. This would not prevent 
the generic unity of the two, were it not for the additional characters of 
a slender shafted humerus, and probably broad short mandible with long 
symphysis. In P. sopita the rami are slender, and the sympysis short. The 
characters are much like those of Catapleura repanda, and I arrange it 
with that species until better information compels a change. 
