PLATE 82 * 
Page 
Fig. 1 - 3. Eurypterus pachycheirus. 412* 
1. The body of an individual of this species, preserving eight or nine articulations of the 
thorax and abdomen. The surface is strongly marked by the scale-like facets, and the 
articulations are coarse and strong. 
1 a. A portion of the crust enlarged, showing the surface markings. 
2. A fragment of stone upon which are preserved two swimming feet, the ancliylosed ventral * 
thoracic segment, and some portions of the anterior feet. These appear to be the remains 
of a large individual, which has been broken up, and the parts separated. The swimming 
foot 2 a shows the lower side, and the joints are partially separated; and fig. 2 b shows 
the lower side of the other foot, also in a reversed position. 
2 c is the fragment of one of the anterior feet, and fig. 2 d is the same placed in a natural 
position : the length of the spines is a very characteristic feature. 
2 <? is the ancliylosed first and second segments on the ventral side, preserving the thoracic 
appendage. The specimen is worn, and the line of suture is scarcely perceptible. 
3. A separate swimming foot, preserving the five outer joints. 
* Plate lxxxh. This plate should properly have been Plate lxxxii a; but the letter a has been accidentally 
omitted both in the text and on the plate. 
