Review of Geinitz on the rocks and fossils of Nebraska, 187 
to occur at Omaha, in the beds referred by Prof. Marcou to the 
Mountain limestone. The separate crinoid plate (fig. 27) given 
by Prof. Geinitz on the same plate, is a first radial piece of the 
same species as the above, or of Hrisocrinus, it being impossible 
to distinguish this part of these Crinoids when found detached. 
The fig. 28 of same plate, evidently represents the subradial 
piece of the C. hemisphericus from the anal side, being truncated 
above for the reception of the first anal piece and strongly in- 
curved below. The columns figured on this plate as Actinocrt- 
nus? probably belong to the same crinoid, or to Zeacrinus mu- 
crospinus McChesney, the spines of which are figured there er- 
Toneously as those of an Actinccrinus. As srg ag no 
Actinoerinus has yet been found in this country above the St. 
uis Limestone. 
Focidaris Hallianus Geinitz, ib., tab. v, fig. 1, is probably 2 
g00d species, and correctly referred. The corals figured on the 
same plate and referred to Cyathaxonia, are very like Coal-meas- 
ure species of the West. One of them may be the same de- 
scribed by McChesney from the Coal-measures of Illinois under 
the name ¢. prolifera. The Fusulina figured on the same plate 
a8 F cylindriea and F. depressa, range through our whole Coal- 
measures, of Iowa, Missouri, Kansas and Nebraska, and far up 
into the Permo-carboniferous of Kansas 
ed upon in determining the age of rocks. ; 
~ Ypora marginata MeCoy. Geinitz, ib., fig. 11. The porife- 
*ous surface of this looks very unlike McCoy’s species. 
f28 correctly identified this with the type for which Prof. Swal- 
pro 
om the & virgulacea in having a row of little short spines {not 
mere granules) along the middle of each longitudinal branch, 
between the two rows of pores, and particularly in having but 
vo rows of pores, instead of from three to five. Prof. Geinitz’s 
figure shows the nonporiferous side, but his artist (who deserves 
, “2 Credit for his accuracy) has well represented the impres- 
‘ons of the row of little spines along the middle of the porif 
| ous side in impressions left in the matrix. 
(To be continued.) — 
_* Since thi writt is fossil in abundance, and many of our other 
Common ard adh rnp oy ml City, obtained above the horizon of the 
Nery beds from which the Dyassic fossils were obtained. : 
