The Chain of Life in Geological Time / A Sketch of the Origin and Succession of Animals and Plants

by Sir John William Dawson

Fig. 78.—Devonian and Carboniferous Trilobites.

a, Phaceps latifrons (Bronn). b, Philipsia Howi (Billings) (tail).

Fig. 79.—Palæozoic Ostracod Crustaceans. Magnified.

a, Bairdia. b, Cytherella inflata (Jones). c, Cythere. Carboniferous. d, Beyrichia Jonesii (Dn.). Carboniferous. e, Beyrichia pustulosa (Hall). Silurian.

The higher, or decapod Crustaceans, now familiar to us in the modern crabs and lobsters, are first found in a few small species in the Devonian[22] and Carboniferous, and they are accompanied in the Devonian by at least one species of the allied group of the Stomapods ([Figs. 81, 82]).

Fig. 80.—Pterygotus anglicus. Reduced.—After Page and Woodward.