CONTRIBUTIONS TO INVERTEBRATE PALEONTOLOGY NO. 6: 
CERTAIN CARBONIFEROUS FOSSILS FROM THE WESTERN 
STATES AND TERRITORIES. 
By C. A. WHITE, M. D. 
Among the collections of fossils pertaining to this survey, and in part 
also to that which has hitherto been under the direction of Professor 
Powell, there are the types of a considerable number of invertebrate 
species, preliminary descriptions of which have from time to time been 
published by the late Mr. Meek and the writer of this article respect-_ 
ively, in certain of the publications of the two surveys; but none of 
which were illustrated before the commencement of this brief series of 
illustrated articles. A large proportion of the species referred to have 
already been. illustrated in the five first articles of this series, namely, 
Contributions to Inverte>rate Paleontology Nos. 1, 2, 3, 4, and 5, and 
the present article is devoted to the remainder. <A few, however, are 
necessarily yet omitted because it has been impracticable to either dis- 
cover the types among the older collections or to satisfactorily identily 
the species among the new ones. Those of the five former articles were 
devoted to Cretaceous, Tertiary, Laramie, and Triassic fossils respec- 
tively, but those of the present one are all Carboniferous. 
As has been stated in introductory paragraphs to former articles of 
this series, it was originally intended that this illustrated series should 
embrace philosophical discussions of the topics suggested by the fossils 
upon which they are based; but circumstances have prevented the ful- 
fillment of this portion of that plan. Therefore this article, like the 
others of its brief series, will be devoted almost exclusively to the de- 
scription and illustration of the fossil species. 
Some general discussions of the questions pertaining to the great 
Carboniferous series of the West have been elsewhere published by the 
writer, but as so very much yet remains to be determined by future in- 
vestigations in the field, it is not thought desirable to repeat them here. 
They may be found in the following-named publications: Explorations 
and Surveys West of the 100th Meridian (Wheeler), vol. iv, part I, p. 
16; Geology of the Uinta Mountains (Powell), p. 80; Bulletin U.S. 
Geol. Sur. Territories, vol. v, p. 209; and Annual Report U. 8S. Geol. 
Sur. Territories for 1876 (Hayden), p. 24. 
A large proportion of the fossils of this article are from the collections 
of the survey under the direction of Professor Powell, having been col- 
lected by himself and Mr. G. K. Gilbert, to whom they are respectively 
credited in connection with each description ; as has also been done in 
the former articles of this series. A few have been sent to the office of 
the survey, and others to the National Museum, by members of the 
United States Fish Commission, and by private parties, whose names 
are mentioned in connection with the descriptions so tar as they are 
known; and the remainder have been collected by various persons con- 
nected with this survey. 
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