Round — Crossotheca from R. I. Carboniferous. 135 



sotheca) B onlay i Zeiller, 6 however, has about the same 

 proportions as Crossotheca nana but is about four times 

 larger. Details of comparison of all these species are 

 shown in the accompanying table. 



Specimens of Crossotheca nana have been found in the 

 Pawtucket and Portsmouth sections of Rhode Island, an 

 indication that the species was somewhat widespread in 

 the Narragansett Basin during the Carboniferous. 



Paleontological Laboratory, 

 Brown University. 



6 Ibid., PI. 4, fig. 4. 



