APPENDIX'. 
3G 
dont, Didyocephalus elegans, Leidy. Botli the plates and teeth are too 
large to be associated with the latter, and the teeth especially remind one 
of the Dinosatiria. Emmons describes a tooth in the following language : 
“ It is compressed, curved, finely serrate posteriorly, which appears to 
point to the apex, when seen so as to bring into view a slight wrinkle or 
groove at the base of each tooth. Its enamel covers the whole crown, or 
all above the part implanted or inserted. The enamel is finely or mine 
utely wrinkled and at the posterior edge, at the junction of the plates at 
each side, a faint groove remains ; and the serrae appear like a double rows 
but near the apex they entirely disappear; the convex or anterior edge is 
smooth. ‘ The tooth appears much like the tooth of a Megalosaurus in 
miniature, though it is less curved. I have found only two teeth of this 
kind; the smallest is half the size of the one figured.” This size is 
.022 m. in length ; diameter at base .012. 
In the section given by Emmons, one side of this tooth is a little more 
convex than the others. 
The affinities of this genus appear to be to Teratosaurus and Loelaps. 
From both of these, as well as from Megalosaurus , it differs in the absence 
of serration from the anterior margin, and in the groove in the posterior 
cutting edge dividing it into two appressed serrate edges which disappear 
near the apex. The species may be called 
ZATOMUS SARCOPHAGUS. Cope. 
Its size about equalled large specimens of the Southern Alligator. 
HYPSIBEMA. Cope. 
Char. gen. Proportions of limbs and feet much as in ITadrosaurus. The 
caudal vertebrae elongate and depressed, in the median part of the series. 
The elongate depressed form of caudal vertebrae, distinguishes this 
genus from Hadrosaurus. The latter possesses elongate vertebrae near the 
extremity of the series, but anterior to this point, they are first subquad- 
rate in profile, then proximally much narrowed. The form exhibited by 
the known species of this genus is more like that of Hylieosaurus Mant. 
IIYPSIBEMA CRASSICAUDA. Cope. 
The remains on which this species is founded consist of the distal 
extremity of the right humerus, a portion of the shaft of the left tibia, a 
a portion of the fibula, the right internal metatarsus somewhat broken > 
and a caudal vertebra. There are other uncharacteristic fragments, and 
a piece which may be a dermal bone. 
