506 Descriptions of the Fossil Plants 



will not satisfactorily show the other divisions. The arms 

 are composed of angular, cuneiform plates. 



This species somewhat resembles S. Whitei, of Hall, 

 but differs in its more robust form, the proportions of the 

 parts, the pentalobate and expanded stem, and in the 

 second radial of the anterior ray being shorter than the 

 others, and not longer, as in that species. 



Locality and position in the lower division of the Bur- 

 lington Limestone, Burlington, Iowa. 



Collection of Mr. Charles Wachsmiith. 



Art. X. — Descriptions of the Fossil Plants collected by 

 Mr. George Gibbs, Geologist to the United States North- 

 loest Boundary Commission, under Mr. Archibald Camp- 

 bell, United States Commissioner.* By Dr. J. S. New- 

 berry. 



[Read October 1, 1862.] 



The fossil plants collected by the Boundary Commis- 

 sion on Vancouver's Island, Orcas Island, and on the 

 coast of Washington Territory, at Bellingham Bay, &:c., 

 form a most interesting addition to the representatives 

 which we had before received of the extinct floras of the 

 cretaceous and tertiary strata of Northwest America. 



Previous to the arrival of this collection, a considerable 

 number of fossil plants had been obtained from this re- 

 gion by Prof. J. D. Dana, Geologist to the United States 

 Exploring Expedition, under the command of Captain 

 Charles Wilkes ; and by Dr. John Evans, United States 

 Geologist of the Territory of Oregon. 



Of the first of these collections, a brief notice was given 



* Published by permission of Archibald Campbell, Esq., United States Commis- 

 sioner, Northwest Boundary Commission. 



FKBRUARY, 1863. 



