Geology and Natural History. 373 
| are seven inches and a half broad. As in the living Dermatemys, 
and the sea turtles, they are covered with large scutes, four in 
number, as in Baena arenosa, The inte rmediate vertebral scutes 
nches wide. 
| manner in which the costal scutes join the marginal seutes, and the 
sternal scutes one another. The species may be named Baena 
unda 
z Dr. Carter’s collection also contains some fragments of bones 
}] ofa large ag settee which are so mutilated as to be hardly charac- 
teristic. A jaw fragment among them, with the retained fragments 
alceosy ops 
mach lar ger th an P. p sus. In absence of other evidence, it 
r 
and att, and an inch srg fe peed in front. 
rter had also sent some fossils to Prof. Leidy, among 
) ahah were portions of poe with nearly full series teeth of 
yrachyus agrarius. This animal is related to the Tapir, Hyra- 
codon, and Lophiodon. The formula of its dentition is the same 
as i ‘yr a: 7 molars, 1 cani nd 3 ors. The true 
molars are like those of Lophiodon, except that the last lower one 
has a bi-lobed instead of a t Uy cro Apparently the 
the last rt a and the oe true a ers a vay’ 
Species of Hyrachyus, which may be n med azimius. ‘TI 
crown of the last premolar is 74 lines antero-posterior, an 
transversely. The true molar has measu about 84 lines fore 
and aft, and 6 lines transversely. The depth of oe} jaw fragment 
below the true molar is over an inch and a half. 
Another fossil is a mutilated incisor, indicating a species of 
Trogosus rather more than half the size of TZ. castoridens, which 
may be name 
A fem aludosus, in the collection, exhibits 
the third abohiaitee heraitcratic of the unequal-toed pa 
The astragalus of this animal almost repeats that of the living 
a 
the remains of Dr. Corson’s collection there is the 
ee crocodile, but too much 
m, as shown both by the ieote and by the soundings 
