SUMMARY OF RESULTS. 



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. 



Of ichthyic remains there is but one Ctenacanthus-like tooth. This with 

 a single 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 



