loS NEW YORK STATE MUSEUM 



width as 3 : 4; in the latter as 2^ : 4), the posterior margin is 

 deeply concave in P. clarkei, the genal angles are broad and 

 long ; in P. roosevelti, however, the posterior margin is 

 nearly straight transverse for the full width of the head shield and 

 the genal angles are short and narrow. 1 The series of crenulations, 

 observed on the posterior margin of P . roosevelti, is not 

 seen in P. clarkei. The eyes are small, lunular, about one- 

 third of the length of the carapace back and one-fifth the width of 

 the carapace distant from the margin. The carapace and. the axis 

 of the abdomen appear, from the wrinkles, to have been higher than 

 those of P. roosevelti. The abdomen is not tapering in out- 

 line as much as that of the other species and the axis is relatively 

 broader. The pleura appear to be narrower and more curved or 

 sickle-shaped. The telson spine has not been observed. 



Echinognathus clevelandi Walcott 



We describe under this name some new remains of a eurypterid 

 from the Utica shale which are mainly interesting in indicating a 

 gigantic size for that species. 



So far only a walking leg and part of a segment have become 

 known of E. clevelandi Walcott. These indicate already a 

 form of fairly large size, easily 1 to 2 feet long. They came from 

 the Utica shale at Holland Patent, N. Y. 



In 1913 Dr A. F. Foerste discovered in the same formation at 

 the " Palisades " or " Gulf " at Rome, N. Y., a spine which he 

 recognized as being derived from a eurypterid and was so kind as 

 to present it to the State Museum. This spine, which is not com- 

 plete at either end and may easily have been longer by one-third, is 

 112 mm long. It is 7.5 mm wide at the proximal and about 4 mm 

 wide at the other end. It is slightly curved and was obviously 

 sharp-edged on both sides. Its most striking feature is the sculp- 

 ture which consists of long elliptical scalelike markings arranged 

 in rather indistinct longitudinal series and a row of narrow drop- 

 like scales along the inner margin. These scale-markings are so 

 typically eurypteroid in character that they at once indicated to 

 Doctor Foerste the systematic position of the fossil. There is little 



1 Figure 1 of plate 2 (op. cit.) shows on the right side a broad genal angle 

 for P. roosevelti, but inspection of the specimen proves that it is some- 

 what crushed and that the draftsman failed to get the correct line which is^ 

 like that on the other, left, side. Figure 3 (ibid.) is a P. clarkei 

 and shows the characteristic posterior margin. 



