21 
Favosites, Halysites — Corals. Eucalyptocrinus — Crinoids. Illce- 
nus — Trilobites. Bythotrephis — probably marine Algse. Penta- 
merus — a large and abundant Bracbiopod, charactenstic of the 
Niagara beds of the Mississippi Basin. Spirifer, Rhynchonella 
— other common Brachiopods. Eurypterus — Crustaceans closely 
allied in structure to modern Scorpions, but being water breathers 
are classed with the Crustacea. A large number of specimens 
from the Water-lime group of New York. 
Case 2F. — Foreign Silurian fossils. From the Wenlock 
limestone of England, several specimens of Periechocrinus, Cya~ 
thophyllum and others. From the Bohemian beds, several species 
of Graptolites, the genera Phacops and Dalnianites among Trilo- 
bites, and many specimens of the Orthoceras family. 
Floor Case A. — Fossils of the Chicago Basin. These occur 
in limestone of the Niagara epoch and have been collected at 
various quarries in the vicinity of Chicago, including the Chicago 
Drainage Canal. They are chiefly of the groups of crinoids, or- 
thoceratites and trilobites. 
Case 2Q, t1 and 3, — Fossils of the Devonian Age or age of 
fishes. The fishes which by their size and abundance character- 
ized this age, belonged to two orders — Ganoids, represented at the 
present day by the garfish and sturgeon, and Placoids, the order 
which includes sharks, skates and rays. They differed in many 
respects from the fishes of the present day, however. The Ganoids 
were covered with thin, bony scales, had teeth of reptilian char- 
acter and jointed, paired fins. The Placoids had cartilaginous 
skeletons, no scales, no gill covers, and many of their characters 
were embryonic. 
Case 2Q. — Lower Devonian fossils of the Corniferous period . 
Favosites — Honey-comb corals. Heliophyllum — Cup corals. 
Ophiura, Lorio /aster —Asteroids similar to modern starfishes. 
Being free-moving Echinoderms, they mark the introduction of a 
higher type than the attached Crinoids. Macropetalichthys—2. 
Ganoid fish. 
Case 2H. — Lower Devonian fossils. Syringopora — Chain 
corals, Zaphrentis — common and characteristic cup corals. Or- 
thiSy Atrypa, Spirifer — Brachiopods. Coccosteus — a typical Ga- 
noid from the Old Red Sandstone of Scotland. 
Case 3 A. — Middle Devonian fossils. Psilophytoriy Sphenop- 
teriSy etc., — early land plants from the Devonian beds of St. 
