DESCRIPTIONS OF SOME NEW SPECIES OF DEVONIAN 
FOSSILS 
CLINTON R. STAUFFER 
University of Minnesota 
A study of materials recently collected from the Detroit River 
series of Michigan and from the Onondaga limestone of Ontario 
has revealed numerous forms that cannot be identified with known 
species. Some of these are too fragmentary to be worthy of descrip- 
tion, although the genera are easily determined. 
The most fruitful source of this material is the Amherstburg 
beds in the Stony Island Dry Cut. Here great heaps of the rock 
removed from this part of the river bed are piled high and are 
rapidly disintegrating under the weathering processes. In 1916 
many of the specimens found were thus badly spoiled and each 
year is continuing the process to ultimate destruction. Grabau 
and Shimer have described many of these forms, but there still 
remain a number of fragments that should be found in well enough 
preserved specimens for description. Attention has been called 
to some of the more common genera,” some of the species of which 
are described as follows: ; 
Arachnocrinus ignotus n.sp.3 
JenoNaminn Ih eigen ai 
This is a medium to small sized species of Arachnocrinus. The 
calyx is too poorly preserved for description, or is too deeply 
imbedded in the matrix to be seen, but doubtless it is small. 
Arms more or less uniform in size, uniserial, long, and showing 
frequent bifurcations. These bifurcations are not uniformly 
spaced on the different arms and one arm does not branch within 
1 Mich. Geol. and Biol. Survey, Pub. 2, Geol. Ser. 1, 1909 (1910), pp. 87-210. 
2 Bull. Geol. Soc. Am., XXVII (1916), 73. 
3 To Dr. Stuart Weller is due the credit for the identification of the genus to which 
this specimen belongs. 
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