To Dr. J. S. Neweehry, State Oeologist : 



Dear Sir : I herewith respectfully submit a report on some of the Invertebrate 

 fossils collected by the State Geological Survey of Ohio from the subdivisions of the 

 Carboniferous system known as the Waverly group and Coal Measures. Preliminary 

 notices of some of these fossils were published, without illustrations, a few years 

 back, in the Proceedings of the Academy of Natural Sciences at Philadelphia ; and 

 the drawings of those here illustrated were subsequently prepared, and are now pre- 

 sented along with somewhat more extended descriptions. At the time these draw- 

 ings were made, it was intended to give more full illustrations of the fossils of these 

 formations, particularly of the Brachiopoda of the Waverly group, which contains 

 numerous invertebrate remains that are not here included. As the report on these 

 fossils, however, was not to be published until that on some of those of the older rocks 

 was issued, work on the former was mainly suspended after the preparation of the 

 drawings now submitted, my attention being for some time after devoted to the prepa- 

 ration of the published report on some of the Ohio Silurian and Devonian fossils, and 

 preparing reports on collections of several General Government Surveys of the West- 

 ern Territories. 



A short time before the published report mentioned above was sent to the printer, 

 I was prostrated by a severe and protracted attack of sickness, that not only prevented 

 me from superintending the publication of the same, but caused an entire suspension 

 of work on the Waverly and Coal Measure fossils. A few of the plates of the latter 

 report, however, were already engraved ; but when the others were called for I was 

 only able to arrange such drawings as were at that time prepared, without regard to 

 the original plan, and even without adding others necessary to the complete illustra- 

 tion of some of the species.* This explanation is made in order that those who use 

 this report may understand why the plates were not more systematically arranged. 

 The original plan was, that the space between the plates now numbered 10 and 14 

 was to be occupied by two or more plates of Brachiopoda, with numbering of the 

 whole made to correspond, while the plate now numbered 13, and only partly occu- 

 pied by Lamellibranchs, was intended to be filled out with the same, and inserted 

 between the plates now numbered 15 and 16. As this, however, for the reasons 

 already explained, could not be done, the intervening space had to be filled with fig- 

 ures of Orinoids described by other parties, which latter figures would have been 

 more systematically placed on plates preceding all the others. 



Had health permitted the completion of the original plan of a thorough study of 

 the invertebrate fossils of the Waverly group, I had intended to prepare for this place 

 some general remarks on the relations of this fauna to those of the Carboniferous and 

 Devonian rocks of other parts of this country and Europe, for which purpose some 

 notes were from time to time prepared. Nothing of this kind, however, will now be 

 attempted here, though it may be proper to remark that I have seen no reason to 

 change an opinion long since expressed in a joint paper with Prof. Worthen, that 

 this rock and its equivalents in Illinois, Indiana, etc , belongs to the Carboniferous 



* This is all the more to be regretted because better specimens of some of the species than those seen by 

 me have doubtless sicce been found. 



