Be 
1878. | Geology and Paleontology. 129 
the American species, and Prof. Cope discovered that the fin 
structure was that of the order above named. These fishes 
were, then, fully armed ; first, with an acute bony rostral weapon ; 
second, with large lancet-like teeth ; and third, with acute-edged 
bony pectoral spines. 
EW GENUS OF OREODONTIDA.—From the Upper Miocene 
(Pliocene) of Montana, has recently been described by Prof. 
ope, a new genus of Oreodontide, which holds an Aere 
ing intermediate position. It has the full dental formula and 
preorbital fossa of Oreodon, but the premaxillary bones form 
a single mass, as in Merycochærus, and there is a large lach- 
rymal vacuity as in Leptauchenia. It differs from the last 
genus in the absence of frontal vacuities. The molars are short- 
crowned, and not prismatic. It is named Ticholeptus, and 
the typical species, 7. sygoimaticus, is the size of Oreodon major. 
It has widely expanded zygomata, which have a horizontal plate- 
like extension at the glenoid region. The anterior face of the 
united premaxillaries is flat, and the nareal fissure is deep. The 
molar teeth are remarkable for their wing-like external ribs, which 
curve forwards. Length of molar series M. .o97; width of 
premaxillary in front .032; length of cranium .225. 
PALHONTOLOGY OF GEORGIA.—Prof. Little, director of the Geo- 
logical Survey of Georgia, has accumulated a valuable scsi i 
of the vertebrate fossils of that State, of cretaceous and tert 
Among these there have been identified the dices Hadro- 
saurus tripos, and the turtles Taphrosphys strenuus and Amphiemys 
oxysterinum, a new genus and species related to Adocus. Mr. 
Loughridge of the survey also discovered a very fine specimen 
of that rare Propleurid, the Feritresius ornatus. 
SILURIAN AND CARBONIFEROUS PLANTS.—Prof. Lesquereux read 
before the American Philosophical.Society of Philadelphia, last Oc- 
tober, two papers, one describing a fungus (R/zzomorpha sigillaria), 
discovered under the bark of a Sigillaria from the Cannelton 
coal of Beaver Co., Penn. The other describes four species of 
plants from the Lower Silurian, viz. : a Pselophyton and Sphenophy- 
first remains of land plants from, the Lower Silurian were dis- 
covered by Dr. Scoville in the Cincinnati beds near Lebanon, 
Ohio 
A NEW ALLY or SIVATHERIUM.—Dr. R- Lydekker of the geologi- 
-cal survey of India, has recently discovered a new genus allied to 
Sivatherium which is of much interest. It lacks anterior cael 
cores, and has but a single base for horns on the vertex. 
