204 L. Lesquereux on the Coal-Formations of the United States. 
from an enlarged base, flabellate, dichotomous, and arched as in 
the larger leaves of Odontopteris Alpina, Sternb. This last 
species, a beautiful one, has been lately found in the Anthracite . 
coal measures of Rhode Island,* together with a number of our 
common goal plants, mostly the species characteristic of No. 8d 
and No. 4th coal. Our specimens are far more complete than 
any of those published in Kurope. The frond, tripinnately ar 
secondary pinne are alternate and open or perpendicular to the 
i 
somewhat distant, oblong, obtuse, slightly scythe-shaped outward, ~ 
ovate. Pinnules or leaves, either entire, obovate-obtuse decur- 
rent on the rachis, becoming broader, shorter, ; 
near the base of the pinne; or elongated, diversely lobed, with 
unequal, linear-long, or short-lanceolate-oval divisions; terminal 
* Tam indebted for the communication of a fine specimen of it to Mr. James. H. 
Clark of Newport, R. I. 
