258 PALEOZOIC TIME. 



called Psilotum, whence the name Psilophytori. The' species of the 

 Corniferous era thus far described were from one to three feet high. 



Fig. 484 B. a-e. 



Fig. 484 C. 



Figs, a, b, c, d, Psilophyton princeps ; e Prototaxites Logani( X%)- 



2. Conifers. — The Conifers arc species of the earliest known genus 

 of tht; family Prototaxites ; and portions of two branches are shown, 

 reduced, in Fig. 484 B, e (from Dawson); the larger was 18 inches 

 across. Another was three feet in diameter, indicating that there were 

 forests of these Devonian yews. 



3. Ferns. — Newberry has found the remains of Tree-ferns in the 

 Corniferous of Ohio, showing that these also 

 were among the trees of the forests. A portion 

 of one is represented in Fig. 484 C. 



The projecting parts over the trunk are the 

 bases of the fallen fronds, just such as occur 

 over the exterior of some modern tree-ferns. In 

 the plate on page 322, a modern tree-fern stands 

 to the left of the middle, and the plants below 

 are small ferns. 



Fig. 484 B, a, Psilophyton princeps; b, the growing ex- 

 tremity of a branch, incurved or circinnate; c, d, fructifica- 

 tion. Fig. 484 B, e, Prototaxites Lognni, one eighth the 

 natural size. The species of Tree-ferns found in the Ohio lime- 

 Caulopteris antiqua. s tone are Caulopteris antiqua Newb. (Fig. 484 C), Caulqpteris 



peregrina Newb. (Protopteris peregrina Dn) 

 Meek has found, in the Corniferous beds of Ohio, globular particles, about a twentieth 



