F. B. Meek—Fossils of the Illinois Geological Report. 189 
of moisture left in the gas after passing the drying apparatus, 
and holding in solution the other products of the reaction, 
namely, hydrogen peroxide, acetic, oxalic, and formic acids, 
and probably aldehyde. 
Yale College, Jan. 21, 1874. 
a 
Art. XX.—Notes on some of the Fossils figured in the recenily- 
issued Fifth volume of the Illinois State Geological Report; by 
F. B. Mrex. 
As stated by Prof. Worthen in a prefatory note to the 
paleontological part of the above mentioned volume, we had 
intended, not only to revise and extend the previously pub- 
ished descriptions of some of our own species, before sending 
the text of this volume to the press, but also to add full de- 
scriptions, with remarks on the affinities of all the forms illus- 
trated on the accompanying plates, including many species that 
had been described by others from far inferior specimens to 
those contained in the splendid collections at our command. 
Il health, however, and other unavoidable circumstances, 
oc 
ings of the Academy of Natural Sciences at Philadelphia oe 
study, icularly those of the Crinoid-a, mainly from Mr. 
Wachstnuth’s alleen we could have added much informa- 
tion to all that was reviously known in regard to the old 
Species, the original jaotccten: of which are merely cited 
Without note or comments in the text. 
