518 TRANS. OF THE ACAD. OP SCIENCE. 



the Lower Permian," and there has been no reason to change 

 the habitat since. 



Messrs. Meek & Hayden, it is true, say it ranges down low 

 in the Coal Measures, but they, at the same time, say it is 

 almost or quite impossible to distinguish it from the semi' 

 reticulatus. If they cannot distinguish it from the semi-reti- 

 culatits they certainly should not add it to a list which 

 already contains that fossil, (I will add it, as it possibly 

 ranges into a few of the upper beds of the Coal Measures), 

 nor is it obvious how they, who do not know the fossil, can 

 declare that it ranges so low in the Coal Measures. 



If, then, we add the 7 others suggested by Dr. Hayden, 

 we shall have 14 instead of 16 fossils (as given in 1858) com- 

 mon to the Lower Permian and the Coal Measures, still an 

 improved showing for the Permian, after all Dr. Hayden's 

 corrections. But there are 8 or 10 Permian fossils to be 

 added, and the catalogue for the Lower Permian, when re- 

 vised to meet the present state of our knowledge, will stand 

 about 15 Carboniferous to 50 Permian fossils, which, being 

 over three to one, will make it necessary to continue the 

 rocks containing them in the Permian System,* even were 

 there no other evidence; unless, indeed, Messrs. Meek & 

 Hayden succeed in proving that there is no Permian. 



But Messrs. Meek and Hayden object to the genus Beller- 

 ophon as not known in the Permian of Europe, and "not 

 known above the Coal Measures" any where. f But Messrs. 

 Meek and Hayden found it in the Permian, as they themselves 

 say, of both Kansas and Nebraska,}; and Maj. Hawn found 

 it in the same rocks in Kansas which proves it a Permian 

 genus. 



Dr. Hayden also thinks fossils of the genera Monotis, 

 Hakevellia, Schizodus, Pleurop horns, /Synocladia, and 

 Thamniscus, because three of the six range down into the 

 older rocks, are no proof of the Permian system; and yet 

 Messrs. Meek and Hayden considered the genera ATonotis, 

 Pleurophorus, Pakevellia and Myalina sufficient evidence 

 to announce§ a Permian discovery upon, though all of them 



subsequent investigations have disclosed no additional proof. But this 

 fossil is very distinct from the Calhounianus, and its distinctive marks are 

 permanent, and I have never found them together. 



* According to the best authorities there is a still larger number of un- 

 doubted Carboniferous fossils in the English Permian. There is a list of 

 20 in the American Journal, vol. 35, p. 133. King's Monograph mentions 

 a number. 



t Am. Jour. 1867, p. 331 et al. 



1 Acad. Nat. Sci. Phil. 1858, p. 44, and 1859, p. 30. 



§ Am. Jour., 1867, p. 331 et al. 



