PALEONTOLOGIC CONTRIBUTIONS III 



The ocellar mound and the scales have been destroyed by the 

 strong flattening of the test. 



The eurypterid remains here described and referred to 

 Echiriognathus clevelandi, all come from the type 

 locality and horizon, namely, the Utica shale at Holland Patent. 

 For this reason and since they all agree in their characters suffi- 

 ciently to point to a single well-defined eurypterid type, we feel 

 quite certain that they indeed belong to one species or at least to 

 one genus. This genus, Echinognathus, would then in the shape of 

 its carapace, metastoma and legs, as well as the peculiar scale- 

 marking, fairly closely agree with Eusarcus, with the distinction, 

 however, that the walking legs are furnished with one or several 

 continuous series of articulated spines of extreme length, similarly 

 to the subgenus Ctenopterus of Stylonurus. 



Eusarcus trigonus nov. 



Plate 33, figure 10 



A collection brought in by Mr C. A. Hartnagel from the Bertie 

 waterlime at Crane's Corners, town of Litchfield, Herkimer county, 

 contains a specimen of Eusarcus, the first representative of that 

 interesting genus from the Herkimer pool or colony which is 

 characterized by the well-known Eurypterus remipes. 1 



The specimen consists of the carapace, preabdomen and the two 

 swimming feet and proves specifically distinct from its congener in 

 the Bertie waterlime, the E. scorpionis. Nor could it be 

 considered as a younger stage of that large form, since we have a 

 young E. scorpionis of the size of our specimen showing the 

 adult features of E. scorpionis (see op. cit., pi. 36, fig. 1). 

 On the other hand, E. trigonus exhibits a striking similarity 

 to E. cicerops from the Shawangunk grit, differing from the 

 latter only in the size and still more marginal position of the lateral 

 eyes. 



Description. Body of small size, distinctly broad and stocky, 

 carapace and abdomen combined of suboval outline. Carapace 

 broadly triangular, one-fourth wider than long. The lateral 

 margins, which are gently and rather uniformly convex, con- 

 verge to the protruding front. The posterior margin was fairly 

 straight. The lateral eyes are kidney-shaped, very prominent, situ- 

 ated marginal, about one-third the length of the lateral margin of 



1 See N. Y. State M*us. Mem. 14, p. 9. 1912. 



