No. 7.— Carboniferous Fishes from the Central Western States. 
By C. R. EastTMAn. 
THE present contribution embodies the results of investigations of an 
extended series of Carboniferous fishes from the Mississippi and Missouri 
Valley region, and is essentially a continuation of “ Some Carboniferous 
Cestraciont and Acanthodian Sharks.” ! With regard to faunal re- 
lations, the subject-matter of the following pages falls naturally into a 
threefold division. Attention is first claimed by the Upper Carbo- 
niferous fish-fauna of Kansas and Nebraska, which is one of great interest 
palaeontologically and morphologically. The Coal Measure fish-fauna 
of Mazon Creek, [llinois, is considered next, and the structure of 
several new and little-known forms illustrated. Last in order of dis- 
cussion are certain new or little-known species from the Mississippian 
‘series, which appear worthy of notice either on account of their mor- 
phologic interest, or because of their relations to other well-known 
forms. The greater part of the material upon which the following obser- 
vations are based is preserved in the Museum of Comparative Zodlogy 
at Cambridge, and so far as possible the location of types and figured 
specimens is given under the caption of the several species, in the case 
of all those belonging to other institutions. 
I. THE UPPER CARBONIFEROUS FISH-FAUNA OF 
KANSAS AND NEBRASKA. 
Altogether, about fifteen species of Upper Carboniferous fishes have 
been described from Kansas and Nebraska in the writings of J. Leidy,? 
O. H. St. John,® St. John and Worthen,* and S. W. Williston.® To 
1 Bull. Mus. Comp. Zool., Vol. XX XIX., 1902, No. 3. 
2 Extinct Vert. Fauna Western Territ. Rept. U. S. Geol. Surv. Territ., Vol. L., 
18738, pp. 311-318. 
8 Hayden’s Final Rept. U. S. Geol. Surv. Nebraska, 1872, pp. 239-248. 
4 Palaeontology of Illinois, Vol. VI., 1875; ibid., Vol. VIL. 1883. 
5 Kansas Univ. Quart., Vol. VIII., 1899, p. 178. 
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