OF CARBONIFEROUS MYRIAPODS. 295 



can be made out. The legs are about as long as the width of the bod}*, stout, slightly 

 smaller at the immediate base than just behind it, tapering beyond the middle and with 

 increasing rapidity nearly to the tip, the last joint (apparently) being equal ; this is hardly 

 shown in the plate, and does not show on all the legs in the fossil, the apices of these 

 members being exceedingly vague ; but in a few instances it appears to be somewhat 

 clearly the case, and a slight appearance of it shows on the leg of the seventh body seg- 

 ment in the plate ; on the reverse of the specimen drawn it appears even more plainly on 

 the legs of the second, fourth, and fifth segments. This apical joint appears as such simply 

 by the contour of the leg, but no other joints can be determined in the same way ; indeed, 

 the legs themselves are only pale shadows, and they are traversed by numerous darker 

 bands which seem to indicate joints, but they are rather more numerous than one would ex- 

 pect, and a little irregular, so that little can be definitely affirmed concerning them ; taking 

 them, however, where they appear most regular and best defined and connecting with 

 them the two or three transverse rows of minute granulations, that seem to encircle each 

 joint with some regularity, and it would appear as if there were about five equal joints in 

 the leg besides the smaller non-tapering apical joint. The length of the legs appears to be 

 slightly greater in the middle of the body than at the two extreme ends ; the middle legs 

 are 4.5 mm. long (of which the apical joint is 0.75 mm. long) and 1.4 mm. broad in the 

 middle, the apical joint being 0.5 mm. broad. No sign of claws can be seen. 



The fourth specimen, received from Mr. Cut after the others had been studied and 

 figured, differs but slightly from the first two. It exhibit' the animal expanded in a 

 straight line, but a little on one side so that only the spine • of one side show in full. The 

 spines of the first and second segments are lateral ; but, nevertheless, no head is visible, 

 being, perhaps, buried in the stone. The spines, especially in ■livi I nil ones, arc of unusual 

 length, the longest being 8.5 mm. long ; they diverge in the fascicles less, rarely excetding 

 a divergence of 35° and usually not exceeding 20°. The fascicles of the hinder half of the 

 body trend slightly backward, increasingly so toward the tip, but they are almost exactly 

 at right angles to the body on the front half. No legs are visible. The body is 32.5 mm. 

 long, or including the spines which fringe the posterior end 35 mm. (perhaps more, for 

 the end of the stone is reached) ; the width of the body is 6.5 mm. ; or. including the mass 

 of spines (on one side only) 12 mm. ; or, including the longest spines, 14 mm. 



These specimens, which agree so closely in size, are consid erably larger than the first 

 specimen found, upon which the description of the species was based by Messrs. Meek and 

 Worthen ; judging by their figure and description, that specimen if extended would meas- 

 ure 23 mm. in length ; or, inclusive of the rods, 32 mm. ; and 3.5 mm. in breadth; or, in- 

 cluding the rods, 8. 5 mm. To judge from the arcuate position and the absence of rods from 

 the under surface, it probably presented a side view or one partially dorsal ; but the 

 authors say that neither head nor feet can be seen ; the distribution of the rods is some- 

 what like that of our fig. 7, that is they are considerably divergent, but the figure gives 

 no sign of any tubercles to which they are ^attached ; the -"general resemblance of the 

 whole animal is so close that no doubt can exist that it is of the same species as those now 

 figured. The specimen has been lost by a fire. 



In a later volume of the Illinois reports the original authors of the species describe 

 another specimen from the same place, only mentioning, however, the rods, which they 



