SUMMARY OF RESULTS. 7 
cally named, and one hundred and nineteen species are identified with 
species already known; of the latter, seventy-nine are identical with species 
found in New York State; eleven species occur in Iowa that are unknown 
in New York, and the remaining species occur in various localities both in 
the Rocky Mountains and the central and eastern portions of the continent. 
The stratigraphic position of each species is given in the systematic list at 
the close of the descriptions. 
The Upper Helderberg horizon of the New York series is represented 
by thirty-eight species common to it and the lower portion of the Devonian 
of the Eureka District; the Chemung Group of the same by sixteen 
species; of the Hamilton species of New York, twenty-three are distributed 
through the lower portion of the Eureka Devonian limestone and eighteen 
species in the middle and upper portions, but not in such a manner as to 
distinguish a middle division corresponding to the Hamilton formation of 
New York. Of strictly Hamilton species in New York, twenty-three are 
found, of which eleven are in beds a little below the summit, and twelve 
just above the base of the formation. F 
Of ichthyic remains there is but one Ctenacanthus-like tooth. This with 
asingle tooth of the genus Cladodus, brought from near the Hot Springs 
of Humboldt Canon, by the geologists of the Fortieth Parallel Survey, is 
all that-is known of this fauna in Central Nevada, although from the pres- 
ence of a strongly-marked horizon of Devonian fishes in the Kanab Canon 
of Northern Arizona, it is a little remarkable that so few specimens have 
been discovered to the north, where the formation has a much greater devel- 
opment. 
With the exception of a species of Psilophyton, a fragment of Cordaites, 
and a few obscure fucoidal remains, the flora of the period is unrepresented, 
although in the upper beds the conditions necessary for the preservation of 
vegetable remains appear to have been favorable. 
The Devonian corals as well as those of the Silurian and Carbonifer- 
ous are not illustrated, and only short notes are given of a portion of the 
twenty-seven species occurring in the Devonian. From what is already 
known of this portion of the fauna, there is little doubt but that future col- 
lections from the area of the Great Basin will give a very complete series 
