Notes upon the Geology of the Wcsteim States. 51 



Obs. This distinctly marked species approaches the E. tricos- 

 tata of Torrey's Monogr. N. Am,er. Cyper. p. 310. It was er- 

 roneously inserted in my Catalogue of Plants in the Yicinity of 

 Columbus^ under the name of E. tortiUs, Schultes. 



Two plants, which have been supposed to be nearly or alto- 

 gether confined to Arkansas, are also natives of central Ohio ; 

 one, the showy Erysimum Arkansanum of Nuttall, has already 

 been noticed ; the other is the Eulophus Ame?^ica7ius of the 

 same author, which I have collected in the Darby Plains, about 

 fifteen miles from Columbus ; and Dr. Short has also detected 

 it in the southern parts of Kentucky. 



Erigenia, Nutt. This genus, which exhibits an union of the 

 campylospermous and coelospermous structures, has been incor- 

 rectly described as destitute of vittee. It has, however, three to 

 four vittas in each interval, and six to eight in the commissure. 



Valeriana ciliata, Torr. t^* Gray. This interesting plant is 

 polygamo-dioecious, at least in the Ohio localities, with, the pis- 

 tillate flowers not more than half the size of the staminate ; just 

 as in V. dioica, tuberosa, tripteris, and several other European 

 species, — fide Koch, Sytiop. PL Germ. et. Helv. p. 337. 



Art. III. — Notes upon the Geology of the Western States ; by 

 James Hall, State Geologist of New York. 



Having made during the last spring a tour of exploration 

 through the states of Ohio, Indiana, Illinois, a part of Michigan, 

 Kentucky and Missouri, and the territories of Iowa and Wiscon- 

 sin ; a few observations upon the geology of this region may not 

 be unacceptable to the readers of the American Journal of Sci- 

 ence. The tour was commenced with a view of tracing the 

 rocks of New York westward, and of ascertaining how far the 

 grouping adopted in the reports already made, was applicable in 

 the western extension of the series. Another object which was 

 deemed of great importance, was that of clearly ascertaining and 

 defining the true position of the rock in which the lead ore of 

 Illinois, Wisconsin, and Iowa is found. 



Much doubt and perplexity has arisen among geologists as 

 well as others, in attempting to harmonize the geological reports 



