Contributions to Invertebrate Palseontology. 50t 



known formations in other States, were this done. This is shown 

 by the fossils from the red Iron-stone beds of the Waverly at 

 Seiotoville, Ohio, among which are forms which indicate the Bur- 

 lington or Burlington and Keokuk beds of Iowa and Illinois. On 

 Plate 10, fig. 4 a-c, of Vol. II, Pal. Ohio, is represented a Productus 

 in the condition of an internal cast, which when studied in numbers 

 in connection with Productus flemivgi var. burlingtoneiisis Hall, 

 from Burlington, Iowa, and Quincy, Illinois, cannot fail to be iden- 

 tified as the same species, while the Hemipronites crenistria of the 

 same plate scarcely differs from Orthis keokuk of the same beds ; 

 and on Plate 14 of the same volume, fig. 6, is already identified with 

 the Athyris lamellosa of the Iowa locality. Although there may 

 be many entirely new forms embraced within the vertical limits 

 occupied by these same shells at the localities from which they are 

 derived, I do not think this a sufficient reason why they should be 

 considered as other than equivalents of the Burlington and Keokuk 

 beds of the western States above mentioned.^ 



Plate XY is occupied principalh^ by new forms from the Coal 

 Measures, while Plate XVI contains many previously described 

 species. The smaller forms represented being mostly illustrations 

 of species found in two separated layers of chert, within the limits 

 of the Coal Measures, near Webb Summit and at Mrs. Banks's 

 Farm, Falls Township, Hocking Co., which were particularly ex- 

 amined for determining their horizons, and the figured specimens 

 were obtained from them in place. ^ These species sufficiently mark 

 their places as within the true coal bearing series. 



For the interesting new forms illustrated on Plate X, I am in- 

 debted to H. Moores, Esqr., of Columbus, Ohio, and to Mr. Somers, 

 of the same place, who have taken pains to collect and send to me 

 for examination much of the well-developed fauna of Carbon Hill, 

 Hocking Co., Ohio. On this same plate is represented a new genus 

 and species of air breathing Mollusk, the discovery of which in the 

 Coal Measures of Marietta, Ohio, is an exceedingly interesting fact, 

 as showing the wide distribution over the American coal region 

 during its formation, the conditions of climate and terrestrial cir- 

 cumstances which permitted the existence of this form of life to 

 extend over Ohio, Indiana, and Nova Scotia. 



1 It may \)% well to state in this connection that these remarks were writien. 

 in 1S80.— R. P. W. 



