1877. } 183 
| Cope. 
as the latter. The angle separating them is not continued on the apical 
third of the crown. The section of the antero-external face is nearly plane. 
The division of the interior or flatter face is similar, but the angle is less 
pronounced. The anterior and narrower face is slightly concave. In this 
crown, asin the first described, there are weak transverse undulations 
near the basal third. 
Measurements. ; M. 
Length of anterior tooth preserved....... sie eireys Ryefeisisers .080 
Length of crown of same........... Bhartah lam kes snes 055 
BE Or Racoon Cron | antero-posterior.......... .022 
tranSVerse......... Sees Ol6 
Diameter near apex of same J Fe ee ee tears are 
(trans verses 42). 2). -. AC HCE .008 
Length of posterior tooth preserved.......-.......66- .040 
Length of crown of second tooth..... Shara ertes waste SRA O OR 029 
Antero-posterior diameter at base of crown............ .025 
ps oe at middle of crown.......... .019 
Transverse diameter os 6 GOH san Mette cicichh .010 
These dimensions indicate an animal of the general proportions of the 
gigantic carnivorous Dinosauria of the genera Lelaps, Megalosaurus and 
Teratosaurus. They exceed those of the Bathygnathus borealis and the 
only known species of Cladiodon, C. loydii. 
The characters which demonstrate that this Saurian belongs to a genus 
distinct from any of the above are, Firstly, the presence of the external and 
internal longitudinal ridges which divide the crown of the posterior tooth 
into four facets. Second, the shortness of the crown as compared with 
its width, a point in which it approaches Palwosaurus. Thirdly, the 
semicircular section of the anterior tooth, a form not found in either Ba- 
thygnathus or Teratosaurus, where almost the entire series is known. It 
is only approximated in some of the Western species referred to Lelaps, 
but is not inconsistent with the characters of that genus as represented by 
them. ; 
To the genus thus characterized, the name Palwoctonus is given, and 
to the species, the name Palwoctonus appalachianus. 
Associated with the teeth of this species, were found several leaves 
resembling those of Pterophyllum; and stems of Calamites occur in the 
same locality. 
Additional specimens received from Mr. Wheatley include anterior, in- 
termediate and posterior teeth of a larger animal than the one above 
described, and intermediate and posterior teeth of a much smaller indi- 
vidual of probably the same species. 
The large half-conical tooth of the large individual, presents a slight 
groove-like constriction at the basal portion of the posterior cutting edge. 
Length of crown above base .060; width at base .025. Width of posterior 
tooth at base .030. The form of the intermediate tooth is between those 
of the others. Its external face is very convex and is not faceted. The 
