422 Scientific Intelligence. 
within the space of seven lines. Whether there is a second row of 
serrations, the imbedded state of the very friable bone in a hard matrix 
will not permit me to determin 
‘The broad surface which is exposed in the specimen, so far as it is 
preserved, is longitudinally furrowed; and about oe fourths of an 
inch from the broken summit it exhibits a transverse zigzag fissure, 
which may probably be the result of an original wpb although it 
has very much the appearance of being an articulation 
CYLINDRACANTHUS ORNATUS, Leidy.—On several occasions fragments 
view them as portions of ichthyodorulites, I am not positive of the cor- 
rectness of my conclusion. The specimens alluded to are found in the 
cretaceous formations of New Jersey and Alabama. The most perfect 
one was obtained by W. Taylor, Esq. ., from near Pemberton, Burlington 
Co., New Jersey. It is over three inches in length with the extremities 
broken off, is straight and gradually tapering, and is perfectly circular 
in transverse section. At the thicker end it is six and one quarter lines 
in diameter, and at the other end five lines. The ¢ entre presents a 
double tubular Fg ed of comparatively small calibre. The surface 
is invested with a thick, enamel-like layer, which is dense, brittle, and 
shining, and Secily fluted ; ; the intervening ridges being of nearly uni- 
form oo with pairs occasionally converging into single ones in 
their co 
2. Notices of some remains of extinct poem recently jeaabs 3 
by Dr. F.V. Hayden, in the bad lands of Nebraska; by Josepx Leip, 
M.D., (Ibid, p 39. )—(1.) Hirrarion rE atm, Leidy. This p sec- 
ond Autos species of Hipparion is established on specimens of five 
superior and one inferior molar teeth, discovered by Dr. Hayden, on 
the White River of Nebraska. The internal isolated enamel columa 
of the upper molars, on the worn crown, is elliptical and more than 
twice the length of the breadth. The central columns of the same 
teeth are comparatively moderately folded. Antero-posterior diameter 
of the first upper molar 15 lines, transverse diameter 104 lines; ante- 
ro-posterior diameter of the largest of the back upper molars 18 lines, 
transverse diameter 12 lines; smallest of the back upper molars 11 
lines square ; antero- ‘posterior diameter of the back inferior molar 12 
lines, transverse diameter 74 lines. 
2.) Hyorotamus Spnbecawtn: Leidy.—This species is founded 
upon a en of specimens of molar teeth, which were discovered by 
in company with remains of Titanotherium, in Nebraska 
Territory. "The t eeth indicate a species of the same size as Hyopota- 
mus bovinus, Owen. Among the specimens are the posterior two a 
; an 
? 
Anthracotherium: the crown of the second premolar consisting of 
single Jarge trihedral lobe, with a tubercle at its postero-internal basa 
angle; and the crown of the third premolar being formed of a trans- 
a 
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