FROM THE CARBONIFEROUS FORMATION. 159 



extremity, which is hardly more than half as broad as the front extremity, and a little less 

 than half as broad as the middle of the body. The swollen portion of the body is therefore 

 unusually distant from the head. In several places near the middle and at the anterior 

 extremity of the body the original texture of the dorsal plates seems to be preserved (fig. 

 14), showing that the surface was covered with minute and rather sharply elevated circular 

 papillae, about 0.035 mm. in diameter and pretty uniformly distributed at distances 

 averaging about 0.1 mm. apart; otherwise it appears to be smooth- but the surface of 

 tbe ventral plates is very finely and transversely striate. 



The junction of the dorsal and ventral plates can be seen high up upon the sides of the 

 body as it lies, as represented in figure 11, the line of separation being a straight one. The 

 segments, as represented by the dorsal plates, are about twice as broad as long in the middle 

 of the body, which has the appearance of being somewhat contracted and thus shortening 

 the segments, but in front and behind they are proportionally longer, being less than half as 

 broad again as long. The dorsal plates are divided transversely into two equal portions, 

 the front portion being elevated, selliform and spiniferous, the hinder half depressed and 

 nearly flat. 



The spines of only one series, apparently the subdorsal, are preserved, but in this 

 throughout nearly the whole length of the body ; each is situated on a somewhat elevated 

 boss which merges into the spine, but at base is as broad as the entire front half of the 

 dorsal plate and develops anteriorly the main spine, a stout, cylindrical, erect, straight 

 stem, slightly inclined backward, which in its middle divides into two portions, a compara- 

 tively small, short, conical, pointed thorn, continuing very nearly the erect line of the main 

 stem but inclined slightly forward, and a similar but very long and slender pointed thorn, 

 as long as or even longer than the main stem, directed backward at a considerable angle 

 and also slightly curved in the same sense, so as to make the entire spine about half as 

 long as the width of the body in the broadest portion of the same, or about two-thirds its 

 width in the other portions. In addition to this forking of the main stem, the boss 

 expands at its posterior extremity, at the hinder lower elevation of the selliform dorsal 

 plate, and bears the spinules which in other species seem to cluster more strongly to the 

 very base of the main stem of the spine ; these spinules are two in number, straight, ver- 

 tical or inclined backward a little, the anterior much longer than the posterior, both 

 slender, nearly equal, tapering only next the pointed tip, arising from a very short main 

 stem which is even stouter than the main stem of the spine proper, the tip of the longer 

 spinule reaching about as high above the body as the fork of the main spine. 



The legs are preserved throughout the greater part of the fragment, but so indistinctly 

 that in no case can the joints be determined with any precision ; they appear in general 

 to be divided much as in Acantherpestes major, but they are proportionally slenderer than 

 there, as is the case with all other species of Euphoberia ; they are slightly shorter than 

 the width of the body excepting near the slender hinder extremity, where they do 

 not diminish in size and length so rapidly as the segments, and are therefore propor- 

 tionally to the width of the body longer than elsewhere ; they appear, as in Acanther- 

 pestes major, to have a median carina, to taper gradually, especially in the apical third 

 and to be either bluntly pointed at the tip, or, in other places, rounded. The legs are 



