BUFFALO SOCIETY OF NATURAL SCIENCES 21 



"The species common to both are Dolichopterus macrochirus and 

 Pterygotus cobbi, both of which are quite rare, while the predominant 

 species in both places are unlike. It is not believed that these differ- 

 ences necessarily express distinct stratigraphic horizons, as both lie 

 near the top of the waterlime succession, but rather indicate original 

 regional separation into distinct lagoons or pools .... which 

 we may assume to have been synchronous. There is, in the face of 

 the difference suggested, a certain degree of approximation in the two 

 expressed by such vicarious species as E. remipes and E. lacustris, P. 

 monophthalmus and P. buffaloensis, which may well mean distinctions 

 due to geographic isolation. The Herkimer pool is well restricted 

 and its faunule cannot be traced very far towards the west; the 

 Buffalo E. lacustris, however, appears alone as far east as Union 

 Springs, Cayuga County, and as far west as Bertie, Ontario. Another 

 difference in these faunas is the preponderating great size of all the 

 species in the Buffalo pool, and, by contrast, the small size of and 

 abundant young among the Herkimer county species; .... 

 That the smaller creatures lived in conditions of shallower water is 

 evinced by the sun-dried and cracked rock surfaces of their matrix, 

 while such evidences are wanting in the Buffalo pool . . . . " 

 (39, 92). Eurypterus remipes, one of the common forms in the Herki- 

 mer pool, is also obtained from the Rondout waterlime above the 

 Cobleskill at Seneca Falls, Seneca county, New York. 



The Manlius limestone of uppermost Monroan age has yielded 

 fragments of Eurypterus micro phthalmus from various localities in New 

 York and also from Ohio. The type, a single cephalon, came from 

 a loose boulder near Cazenovia, Madison county, New York, con- 

 taining also fragments of Spirifer vanuxemi from which the age of the 

 boulder was determined. One nearly entire specimen was found in 

 the drift of Onondaga Valley, near Syracuse, New York. Of the 

 number of carapaces now in the New York State Museum, one was 

 collected "in the town of Litchfield in Manlius limestone, not less 

 than 100 feet above the Eurypterus horizon in the Bertie waterlime" 

 (39, 194). Professor Whitfield's type of E. eriensis (now regarded 

 by Clarke and Ruedemann to be the same as E. micro phthalmus Hall) 

 came from the hydraulic limestones, the Put-in-Bay dolomite, of 

 Beach Point, Put-in-Bay Island, Lake Erie, Ohio. 



There is one more Siluric fauna to be noted and that is the one 

 in the Kokomo waterlime of Indiana. Clarke and Ruedemann, fol- 

 lowing Schuchert correlate the Kokomo with the Noblesville of 



