PLATE 82* 



Page 

 Fig. 1-3. EURYPTERUS PACHYCHEIRUS. 412* 



1 . The body of an individual of this sp«cies, preserving ciglit or nine articulations of the 



thorax and abdomen. The surface is strongly marked by the scale-like ftieets, 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 anchylosed 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 lig. 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 rf is the same placed in a natural 



position : the length of the .«pines is a very characteristic feature. 



2 e is the anchylosed first and second segments on the ventral side, preserving the tlioracic 

 appendage. The specimen is worn, and the line of suture is scarcely perceptil)le. 



3. A Feparate swimming foot, preserving the five outer joints. 



•Plate lxxxii. This plato should properly have been Plate i.xxxii A; but the letter A bus been accidentally 

 omitted both io the text and on the plate. 



