1853.] Geology and Paleontology. 1153 
mencing in advance of the latter. Caudal fulcra continued into 
broad flat scuta extending forwards on the median line. Superior 
lobe of caudal fin much more produced than inferior. A lateral 
line. 
Crassopholis magnicaudatus, sp. nov——Basilar interneural bones 
18; body slender at dorsal fin and contracted at caudal peduncle. 
Dorsal and anal fins moderate, caudal very large, with strong an- 
terior fulcral rays. The fulcral scuta are longitudinally oval, and 
ave a groove along the middle line. The caudal hamapophyses 
are short and expand distally. They soon disappear in the 
This discovery introduces the ancient order of Chondrostei to 
ave Eocene fauna. The specimen was found by Mr. E. W. Hol- 
d 
and. 
Tadd that gars of the genus Clastes are found in the Green 
River shales, They are of two species, one with an obtuse muz- 
ale like that of a Polypterus, and the other of the longer nosed 
type like the C. cuneatus—E. D. Cope. 
THE Carson Foorrrints.—The first definite information we 
received on this subject was contained in a paper by Dr. Hark- 
‘ory is untenable. Professor Marsh thinks they are made by 
sloths. To prove this hypothesis it is necessary to account for 
the absence of claws. The facts that gravigrade sloths walked 
on the side of the foot does not preclude the taking of impres- 
‘ons of claws. It is said, however, that the tracks, as preserved, 
are Not the real tracks, but only rather impressions of the tracks 
d by several layers of mud.—Z. D. Cope. 
an QUATERNARY BEDS AT BILLANCOURT, PARIS. — 
imigenius, Rhinoceros tichorhinus, the Irish elk, the onae 
"oS primigenius, some bones of birds and a few sponges an 
d 
