4o8 



NORTH AMERICAN INDEX FOSSILS. 



i6. E. lacustris Harlan. (Fig. 1708.) Siluric. 



Stout; anterior portion of abdomen very broad, abruptly taper- 

 ing beyond the sixth segment ; next to the last segment quad- 

 rate, without lateral flanges. 



Very abundant in the waterlime of North Buffalo, New York. 



^S£V 



1709. Eurypterus remipes, upper and under side of an individual, restored ; 

 the first pair of appendages omitted. Reduced. (Pal. N. Y., III.) 



17. E. remipes Dekay. (Fig. 1709.) Siluric. 

 Animal small, with the lateral margins of the body making 



broad outward curves and tapering very gradually backwards. 

 The next to the last segment slightly, if at all, flanged. (Type of 

 genus.) 



Occasionally in the waterlime of North Buffalo, New York. 



18. E. robustus Hall. (Fig. 1710.) Siluric. 

 Like E. lacustris but larger and more robust, and proportionately 



narrower over the anterior abdominal region. 



Common in the waterlime at North Buffalo, New York. 



