Fossil Scorpions 1^1 



has confirmed its reference to this genus, which becomes the second genus 

 of the Paleozoic scorpions to have representatives on the two continents. 

 Eobuthus pottsvillenHis n. sp. (Plate II. figs. 1, 2, 3, and 4.) 

 This species is represented by a single specimen, the ventral sur- 

 face of which is exposed. Since all the other known examples of this 

 genus also preserve the ventral side, satisfactory comparisons can be 

 made. 



The measurements of the specimen are as follows: 



Total length— 37.6 mm. 



Length of tail — 16.7 mm. 



Length of first joint of tail — 3.1 mm. 



Length of second joint of tail — 3.8 mm. 



Width of next to last segment of abdomen — 8.8 mm. 



Length of chela — 9.4 mm. 



The structure of the cephalothorax is indeterminable due to the 

 condition of fossilization. 



The shape of the praeabdomen is an elongate oval. The sternum 

 is clearly oval or sub-oval in outline. In shape it is closely similar to 

 the British and Bohemian specimens except that the sternum of the latter 

 specimens seems larger in proportion. The bilobed shape of the third, 

 fourth and fifth sternal plates is very striking, and they seem to overlap 

 in shingle fashion. No traces of stigmata can be observed even when 

 examined under the high power binocular. The sixth praeabdominal 

 segment curves in a convex line and joins the postabdomen, whose 

 first segment is about one-half the width of this last segment. 



The first two segments of the postabdomen are well preserved and 

 show the keel structure in a remarkable degree. The third joint of this 

 division of the body is partly destroyed, but the general size and shape 

 of the first three segments are about the same. The fourth and fifth 

 joints are badly crushed and lost and their outlines can barely be de- 

 termined. The telson or poison sting is well preserved and lies deeper 

 in the matrix and to the left of the main trend of the tail, this being 

 the first specimen of the genus which has this part of the body pre- 

 served. 



The appendages are as follows: 



The outline only of the chelicerae is determinable. The right one 

 stands out in advance much farther than the left. Their chelate struc- 

 ture can only be inferred. 



The right pedipalp is fairly well preserved, the left one being 

 ci'ushed back on the tips of the first left walking legs. In comparison 

 with other specimens these appendages are moderate in size only. The 

 chela of the right pedipalp is preserved in an edgewise condition which 

 gives it a very slender appearance. The position and length of the 

 movable finger cannot be determined. 



Only the coxae of the first pair of walking legs are preserved and 

 the position of these seems to be normal. More of the second pair 

 of walking legs is preserved than of any of the others. The right 

 second walking leg is only preserved to the third joint which is 



