A Revised List of Cincinnati Birds. 193 



have been introduced in America, the reader is referred to an able 

 paper on the subject by Dr. Elliott Coues, in the American Naturalist 

 for August, 1878. 



The foregoing- are doubtless but a portion of the changes in the 

 Avian-fauna of this localit}^ within the period mentioned, as many others, 

 of which we have no definite record, have probably taken place; it is 

 apparent, however, that the various conditions attendant upon civili- 

 zation have resulted, directly or indirectly', in the extirpation ot several 

 of our larger species ; while, on the other hand, there has been a decided 

 increase both in species and in individuals, among the smaller birds. 

 And finally, in these various changes that have occurred in our Avian- 

 fauna, we have an excellent illustration of the workings of that uni- 

 verstil law of nature, in accordance with which the living things of a 

 country or district become adjusted to their surroundings; protection 

 from enemies and an increased food-supply, resulting in a greater 

 abundance of some forms, while extermination is the fate of others 

 whose habits or constitutions will not admit of the modification neces- 

 sary to adapt them to new conditions, 



Madisonville, Hamilton Co., Ohio, December, 1878. 



REPORT OF COMMITTEE ON GEOLOGICAL NOMEN- 

 CLATURE. 



To the Cincinnati Society of Natural History : 



Your Committee, appointed to report upon what seems to be the cor- 

 rect nomenclature of the Lower Silurian Rocks of South-western Ohio, 

 South-eastern Indiana, and Kentuckj^, represent : 



That the fossils found in the strata, for twenty feet or more above 

 low water mark of the Ohio river, in the 1st Ward of the city of Cincin- 

 nati, and on Crawfish creek, in the eastern part of the cit}', and inTa}-- 

 lor's creek, east of Newport, Kentucky, at an elevation of more than 

 fifty feet above low water-mark in the Ohio river, indicate the age of 

 the Utica Slate Group of New York. A fauna is represented in these 

 rocks, that is not found above or below them. Within this range, we 

 find the Triarthrus hecki.^ Leperditia hyrnisi, Leptoholus lepis, Butlio 

 trephis ramulosa, and several species of Graptolites, Crinoids, Bryo 

 zoans, and Brachiopods, that seem to be confined within its limits. 

 Moreover, the brown slates and greenish-blue shales and concretionary 

 nodules give a lithological character to the strata, which distinguish 

 them from the strata both above and below. From the evidences thus 

 furnished by the lithological character of the strata, and the distinct 



