354 The American Geologist. ■'"ue, isoo 
given as far as known. The list of localities embraces Iowa, 
Wisconsin, Illinois, Manitoba, Cincinnati and New York. It 
is made thus extensive to show the wide extension of 
the Cincinnati group, and the absolute connection of the 
Maquoketa series with the Cincinnati exposure. Out of 
the 41 species enumerated only 9 species are not found at 
Cincinnati, with doubt in respect to two of these. This 
number is likely to be reduced. Out of the 41 only a sin- 
gle species is peculiar to Iowa, though some of them are 
found only in the adjoining states of Wisconsin and Illinois. 
At the same time no less than 23 species are found in New 
York state, with a possible increase in number. 
A few observations on some of the species of this list will 
now be made : 
*S'ireji)<e^asmrt co/-/('-ir«,/(6/;i. was not collected by me, but I was 
assured that it was found frequently in the bed of the creek. 
DiplograjJtus peosta. A form identical with this has been 
described from the Trenton of New York. Dr. R. R. Gurley, 
of the National Museum, who is working on a monograph of 
the Graptolites, thinks it may be the earlier described D. 
ample.cicaide Hall. A similar, if not identical species, has been 
found at Cincinnati. 
Heterocrinus hetcrodaciylus was identified from a segment of 
the column. 
PorocrhiHs cras-ms identified from a single plate of the body. 
The markings are so characteristic there can be no mistaking 
it. Fragments of other species of crinoids were found but 
have not been identified. 
Paleschara maculata was originally described from the Niag- 
ara of Indiana. It is impossible to separate the Iowa form 
from the Niagara. A species of the genus is found in the 
Lorraine of New York, and another, or a closely related genus 
in the Cincinnati exposure. 
Lingula coburgensis has priority over L. covingtonensis Hall 
<& Wliitf. The first was described by Billings from the Tren- 
ton of Canada ; H. & W's. species is from the Cincinnati ex- 
posure. 
Lingula daphne is Billings's name for the form figured by 
Hall as L. attenuata, Sowb'y. 
Coleolus ? sp. This is a very abundant form, and is the 
only one peculiar to this locality. It varies from straight to 
