PROUT—BRYOZOA, 4TH SERIES. 571 
name, because it is one of the most characteristic Brachiopods 
of the Upper Archimedes or Chester Limestone, and is found 
in the greatest abundance at the typical locality Chester, in 
Randolph County, Illinois. 
CuoxeTes ILLINOIENSIS, n. sp. 
gel Logani, Hall; Iowa Report, Part II., page 598, not of Norwood and 
The Chonetes above named, which has been referred by 
Prof. Hall to C. Logani of Norwood and Pratten, is not only 
very different in its specific characters from the true Chonetes 
Logani, but holds an entirely different geological position. 
it is restricted to the Crinoidal beds of the Mountain Lime- 
Messrs. N. and P., the fem all the beds exposed at Bur- 
lington, Towa, to ‘the fountain closet series, and hence 
spines on each side of the beak.” Our shell is also more than 
twice the size of C. Logani. It is abundant in the white 
— — eset , Illinois, where the original specimens 
yf Descriptions 9 
ee Rocke, ch the Western & 
Coscrstem Wonruest,1 n. op. 
re at 
ig ales ve ga lanes of e ao rar change , 
5 longitudinal f er fiv vas seven and one half; 
ee ale . 
outward tthe plane ofthe surfaces from the mid. 
only meer modified by the elevation of the lateral 
