40 FOSSIL COAL PLANTS. 



112. C. bicuspidatus, Sternb., Loc^ cU. 

 Cuyahoga Falls. 



113. C. minutus, {n. sp.) 

 Cuyahoga Falls. 



114. c. ? 



Cuyahoga Falls. 



RHABDOCARPOS — GOEPP. & BERG. 



115. R. compressus, (n. sp.) 

 Cuyahoga Falls. 



TRIGONOCARPON — BRONG. 



116. T. Noggerathii, Brong., Prod., p. 137. 

 Cuyahoga Falls. 



117. T. tricuspidatum, (n. sp.) 

 Cuyahoga Falls. 



118. T. magnum, (n- sp.) 

 Coshocton. 



119. T. multistriatum, (n. sp.) 

 Cuyahoga Falls. 



Some of my specimens of Trigonocarpon are so well pre- 

 served as to exhibit something more of the structure of this 

 fruit than has been hitherto known. They show it to have 

 been monospermous ; the nucleus, which was ovoid, and 

 without ridges, being marked exteriorly much like the 

 nutmeg. Surrounding the nucleus was the shell, composed 

 of three segments, separating by sutures, which seem to 

 have divided the three principal ridges. Between these 

 three ridges were three or more secondary ridges, which 

 were sometimes obsolete. The three principal ridges were 

 expanded into wings, which had sometimes a breadth at 

 their widest x^art, equal to half the diameter of the nut, 

 and which, uniting at the apex, were prolonged, much 



