The American Midland Naturalist 



PUBLISHED BI-MONTHLY BY THE UNIVERSITY 

 OF NOTRE DAME, NOTRE DAME, INDIANA 



VOL. V. SEPTEMBER, 1918. NO. 11. 



Some New Brachiopods and Gastropods from the Devonian of Iowa. 



BY CARROLL LANE FENTON. 



I. — Explanation. 



For some time I have had in my collection representativei&fctfaj 

 various species occurring in the Cedar Valley Stage or the Hack- 

 berry Stage of the Iowa Devonian. These forms, I have been sure, 

 represented new varieties, and in some cases, probably new species. 

 It is some of these forms that I desire to discuss in this paper. 



The following is a list of the species here considered, with locality 

 of original description. 



Strophonella reversa Hall. Strophodonta reversa Hall, Geology of 

 Iowa, Vol. I, part 1 ., page 494, Plate 3, figure 4, a, b, c, d. 



Douvellina arcuata (Hall). Strophodonta arcuata Hall, Geology of 

 Iowa, Vol. I. part 1 , page 492. Plate 3, figure 1 and 2. 



Atrypa reticularis (Linnaeus). Anomia reticularis Linnaeus, 

 Systema Naturae, 12th edition, Vol. I, page 1132. (A. reticularis, 

 in Hall, Geology of Iowa, Vol. I, part 1, page 515. Plate 6, figure 

 6, a, b, c.) 



Spirifer Whitneyi Hall, Geology of Iowa, Vol. I, part 1 . page 502. 

 Plate 4, figure 2, a, b, c e. 



Spirifer cyrtinaeformis Hall and Whitfield. 23rd Annual, New 

 York State Cabinet, page 238. Plate II, figures 21-34. 



Spirifer orestes Hall and Whitfield, 23rd Annual, New York 

 State Cabinet, page 237, Plate II, figures 16-20. 



Floydia concentrica Webster. Iowa Naturalist, Vol. I, page 39. 

 (See also Naticopsis gigantea Hall and Whitfield, 23rd. Annual, 

 New York State Cabinet, page 238. Plate 12, figures 8-10. 



All of the forms here noted occur above the Cedar Valley 

 Stage, while one, Atrypa reticularis alta, also is represented in this 

 formation. As there is considerable difference of opinion as to the 



