CAEBONIFEROUS MYRIAPODA OF ILLINOIS. 431 



fore regarded as belonging here. In this respect they agree apparently with E. hroionii 

 of England, with which indeed they may possibly prove identical, though they grow to 

 a mnch lai'ger size than any British specimens I have seen. 



The most perfect example (figs. 4, 5) is preserved upon a side view, each half with a 

 distinct and partial coil. The lateral termination of the dorsal and ventral scntes is visi- 

 ble thronghont; and the large transverse spiracles are readily seen next the outer base 

 of the legs, in the middle of the segments or with the anterior edge in the middle of the 

 segments. The head shows little beyond its outline, and appears little larger than the 

 segment behind it, with an inferior tapering prolongation; fi-om a little below the middle 

 of the front springs an antenna whose total length a little exceeds that of the head, in- 

 terrupted in the middle, but apparently as a whole consisting of ten or eleven joints 

 which are oval and subequal, more than half as long again as broad, and slightly larger 

 apically than basally, the terminal joint smaller than the others. The body is lai-gest in 

 the middle and subequal in more than the middle half, tapering about equallv and very 

 gently at each extremity. As thus preserved, upon a side view, shoAving only one half 

 of their surface, the dorsal scutes are of about equal length and breadth, and appear to 

 be composed of a larger anterior and shorter but higher posterior section, upon the latter 

 of which the straight, simple, delicate spines shorter than the segments are mounted. 

 The legs are exceptionally short and stout, and blunt tipped, hardly tapering; they are 

 about as long as the segments. 



Length if uncoiled, 84 mm.; height in middle, 4.5 mm.; length of segments, 2.75 mm.; 

 of spines, 2 mm.; of legs, 2.5 mm. 



Mazon Creek, 111. Mr. R. D. Lacoe, N"o. 1820cd. 



One of the largest specimens belonging to this species (PI. 35, fig. 1) is also preserved 

 upon a side view coiled into a semich-cle. The ventral scutes hei"e look as if formed of 

 a collection of transverse straps, three oi* four to each scute, with a finely granular sur- 

 face, but the dorsal scutes are less perfectly preserved, though when clear diller in no 

 way from those of the typical specimen; the spines at the front end of the body are, 

 howevei-, relatively coarser and the legs seem relatively longer. The specimen measures 

 130 mm. in length, and 9 mm. in middle height, tapering as in the preceding toward 

 either end but perhaps over a longer i-egion. The specimen is in the collection of Co- 

 Imubia College, whence I received it throngh the coui'tesy of Prof. J. S. ^Newberry. 



Another specimen (PI. 36, fig. 8) shows the same view of the front half of an animal 

 stretched out straight, and is interesting principally from its preserving one of the an- 

 tennae attached to the middle of the front of the head (fig. 7) ; this is apparently not com- 

 plete, a little shorter than the head and composed of about seven joints, some of them 

 obscure, but where best preserved cylindrical and half as long again as bi'oad; it taj^ers 

 a little. The distinction between the anterior and postei-ior sections of the body-seo-- 

 ments is greater than usual, and where the surface is clearly seen it is distinctly and 

 rather coarsely grauuhite; the stigmata are very distinct, and as in the previous speci- 

 mens, but the legs are vague. It comes from Mazon Creek, III, and bears the number 

 1820ef, in Mr. Lacoe's collection. 



Other specimens, some received from Mr. Lacoe, others from Mr. Gurley, do not ap- 

 pear to add much to what these have told us. One, however, IS'o. 1820gh, of Mr. Lacoe 



