Cope.] 48 [March 3, 
foramen opens almost superiorly; the posterior margin of the jaw is 
deeply grooved. 
The C. ponderosa differs from C. repanda in its rounded instead of 
flattened rib-ridges on the inferior surface of the costal bone, and in the 
different proportions of the crests of the femur. The lesser trochanter in 
the latter is more robust, and less narrowed and prolonged as a ridge on 
the shaft. The proximal half of the shaft is straight; in C. ponderosa 
curved. 
This species was discovered by John G. Miers, a gentleman who has 
already enriched paleontology with many interesting forms. From the 
upper bed of Cretaceous green sand at Hornerstown, New Jersey. 
In the nomenclature of the elements of the plastron of the Testudinata, 
I will in future adopt in part that proposed by Parker (on the shoulder 
girdle Roy. Society, 1869), who has shown after Rathke that the posterior 
pieces do not belong to the sternum. The bones from front backwards 
should then be named, clavicle (‘‘episternal’’), mesosternal, hyosternal, 
Ayposternal, and postabdominal (‘‘xiphisternal ’’). 
CROCODILIA. 
BotTrosaAuRUS MACRORHYNCHUS, Iarlan. 
C. harlant, Meyer. Bottosaurus harlant, Agass., Leidy, Cope. 
’ The present state of knowledge of this rare species and genus involve 
some confusion, and I propose here to set it to rights in a brief manner. 
This is rendered easy by the discovery of the almost complete skeleton of 
a nearly grown individual, in the upper bed of cretaceous green sand. 
Following my predecessors, I regarded the Crocodilus basitruncatus of 
Owen as this species, in the synopsis Batr. Rept. N. Am., 1869, p. 65, 
but with expression of considerable doubt. At page 231 of the same 
work, I distinguished the species of Owen asa true Jolops. As I had sup- 
posed the ‘cervical vertebre to present the characters of Holops, the 
assignation of the specimens on which this opinion was founded to a 
species of that genus, left an entire uncertainty as to their character in 
Bottosaurus. The discovery of a series of vertebree as above mentioned, 
settles that their structure is not that of the other cretaceous genera, but 
that of the Tertiary and recent forms, 7. ¢., that the hypapophysis of the 
cervicals are produced and undivided to the axis. Deducting the errone- 
ously supposed character, there remains one curious feature to distinguish 
this form from the recent Alligator. The fangs of the teeth posterior to 
the eleventh are not enclosed by the dentary bone, but are exposed to the 
inner face of the splenial. How far the latter protects them the nature 
of the specimen does not allow me to decide. 
It remains to correct the specific relations of this crocodile. At page 
230 of the above work, I described a new species of Bottosaurus, under 
the name of B. tuberculatus, establishing it on remains of cranium of one 
individual and those of the posterior parts of a skeleton of another. The 
anterior part, with jaws of the latter having fortunately been recovered 
