32 
from the Water Lime group of New York. These are Crustaceans 
of the order of Entomostraca, having their nearest modern repre- 
sentative in Cyclops, a microscopic fresh water animal. 
Case 2F.— Foreign Silurian fossils. From the Wenlock 
limestone of England, several specimens of Periechocrinus, a 
large and beautiful Crinoid, Cyathophyllum , a Cup coral, and 
others. From the Bohemian beds, several species of Graptolites, 
the genera Phacops and Dalmanites among Trilobites, and many 
specimens of the Orthoceras family, including Phragnioceras and 
Gomphoceras. 
Cases 2G, H and 3.— Fossils of the Devonian age or age 
of fishes. The fishes which by their size and abundance charac- 
terized this age, belonged to two orders— Ganoids, represented at 
the present day by the gar-fish 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 being covered with thick, bony scales, having teeth of 
reptilian characters and jointed, paired fins. The Placoids had 
cartilaginous skeletons, no scales, no gill covers, and other embry- 
onic characters. 
Case 2 G.— Lower Devonian fossils of the Corniferous period. 
Favosites — Honey-comb corals. Heliophylluni — Cup corals. 
Ophiura^ Loriolaster — Asteroids similar to modern starfishes. 
Being free moving Kchinoderms, they mark the introduction of a 
higher type than the attached Crinoids. Macropetalichthys a 
Ganoid fish. 
Case 2 H.— Lower Devonian fossils. Syringopora~-Ct\’^\\\ 
corals. Zaphrentis—zommow and characteristic cup corals. 
Orthis, Atrypa, Spirifer — Brachiopods. Coccosteus a typical 
Ganoid from the Old Red Sandstone of Scotland. 
Case 3A.— Middle Devonian fossils. Psilophyton—on^ of 
the earliest of land plants. It belongs to the group of Lycopods 
or club-mosses. Holoptychius, Glyptolepis, Diplopterus—l\s\i^s 
from the Old Red Sandstone of Scotland. These are nearly all 
Ganoids, as maybe seen from the large, bony scales with which 
they are covered. CyathophylluM^ Cystiphyllufyiy Zdphveyitis— 
^^^Case3B.— Upper Devonian fossils. Large, polished masses 
of Acervularia from Iowa, a honey-comb coral. Dictyophyton 
large masses from New York, belongs to the class of sponges. 
Aspidosoma, FurcasUr— Asteroids. Spirifer, Brachio- 
