NAPLES FAUNA IN WESTERN NEW YORK, PART 2 367 



to indicate the first or the final appearance of given species in a certain sec- 

 tion. It would be difficult indeed to indicate any. governing principle in 

 such assemblages or to draw therefrom conclusions of breadth or weight in 

 the interpretation of faunation. 



CORRELATION OF THE FAUNA OF THE GENESEE PROVINCE WITH THE 

 INTUMESCENS FAUNA OF EUROPE 



To enter into detail with regard to specific similarities between the 

 New York and other manifestations of this fauna would be to redescribe a 

 large measure of the entire assemblage. We have noted several species 

 which, ignoring fugitive variations, are here determined as identical in both 

 the Eurasian and American regions ; many others reveal indications of closest 

 alliance which are provisionally designated with distinctive terms. Herein 

 are evinced a most remarkable uniformity and persistence of specific charac- 

 ters over a tremendous area of the ocean, which make this zone one notable 

 in geologic history for the vigor with which its life forms have perpetuated 

 and disseminated their distinctive traits ; and, accompanying this uniformity 

 of bionic expression, is a singular correspondence in the rather unusual 

 quality of sedimentation. 



We find the following species of European faunas present in the New 

 York basin. 



Entomis serratostriata Sandberger. The index species of the Cypridina 

 shales everywhere ; occasionally at lower horizons (Upper Hartz). Rare in 

 the Cashaqua shales of Livingston county. 



Entomis variostriata Clarke. In the Goniatite limestone at Bicken and 

 the Cashaqua shales of Livingston county. 



Manticoceras intumescens Beyrich. M. pattersoni and M. rhyn- 

 chostoma, the principal expressions of this type in the eastern and west- 

 ern subprovinces respectively, differ no more from each other than the 

 varying expressions of M. intumescens. To apprehend the real value 

 of these differences in the European forms, much study is still required, for 

 in them doubtless is to be found the key to the origin and point of dissemi- 

 nation of the species. We have employed other specific terms as indicatory 



