214 C. D. Waleot— New Genus of the Eurypterida. 
e 2, is a sketch, 7-10ths of the natural size, of the 
cephalic appendage as it appears on the surface of the slate 
- and in the matrix. The entire length of the appendage from 
the point aa to the end of the terminal joint 7, as restored to 
its natural position, would be 125™, exclusive of the basal 
joint ataa. The long spines of the joints 3 and 4 are 5™ in 
length. 
Fig. 2.—Reduced to 7-10ths the natural size. The joint (1) overlaps (2) and is 
broken away on its posterior margin. The line crossing it should be a slight 
The joint marked (1) is broad and short with a rounded de- 
pression at the center of its inner margin. There is no evi: 
dence of the attachment of the long spines that are articulated to 
the posterior side of the succeeding joints. From the form of 
the joint and the presence of broken fragments of the test in 
the matrix at aa it is probable that it is the second joint of the 
appendage and that the first or basal joint is broken up. T 
joint (2) is large, elongate, rudely subtriangular, the long ante- 
rior margin curving around to meet the nearly straight poste- 
rior margin at its inner end. e latter margin has nine long 
curved dn articulated to it while the three following joints 
(3, 4) and (5) have but three each on their posterior et, 
These joints (3, 4, 5), are more or less quadrangular in outline, 
tle elongate. The spines 
