THE EURYPTERIDA OF NEW YORK 405 
Besides these three more important fragments there are small patches 
of lobate fringes such as the posterior margins of the tergites of the 
_ later eurypterids frequently exhibit. Their variation in length and 
form, as well as their characteristic sculpturing, are shown in White’s 
photographs, reproduced on his plate 11, figure 2, 2a, 6-10. The smaller 
of the lobes, which are invariably blunt and closely arranged, are smooth 
on the underside and show the impression of spines or short bristles on 
the other. The adjoining integument shows a pavement of polygonal 
scales similar to those observed on the gnathobase of the coxa. The largest 
lobes reproduced by White in figure 2, 2a of plate rz are rounded and 
thick and represent a radiating group of stout, hollow processes. These 
are also covered with oblong, umbilicate impressions, obviously the molts 
of imbricating plates with perforations that probably were connected with 
spines. | 
We may point out in this connection that Salter in 1862 [p. 78} 
described as Eurypterus (2?) from the Coal Measures at the Joggins, N. S., 
the proximal portion of a telson which seems to be a fair expression of the 
posterior portion of such a telson as that of Hastimima whitei, 
even down to the suture of the median carina. We introduce here [text 
fig. 94] a copy of the Joggins specimen with the outline restored to cor- 
respond to that of the telson of Hastimima. This telson fragment is 
associated with fragments of segments bearing the characteristic thick, 
drop-shaped or club-shaped tubercles of the later eurypterids. It has 
been kindly loaned to us by Professor Frank D. Adams from the Redpath 
Museum of McGill University. We agree with Salter ‘that it can hardly 
be supposed to be other than the caudal joint (broken) of an Eurypterus 
or allied form.” It is evident from the specimen that there was an 
elevated median part, apparently with a sulcus in the middle, flanked 
by two lateral wings with a flat border. 
The Brazilian fragments of the segment and telson are so much alike 
in their ornamentation that they are safely referred to the same species 
and genus and properly considered as the type specimens of the eurypterid 
