160 S. H. SCUDDER ON SPINED MYRIAPODS 



about 7 mm. long in the front part of the body, 9 mm. in the middle and 5.5 mm. at the 

 posterior extremity. The spines are about 5 mm. long. 



Mr. Armstrong's specimen represents nearly as large an individual as the preceding, 

 but it is not so well preserved, nor is the fragment so great, being composed of thirteen 

 or fourteen segments besides the head, and exhibiting a dorsal view, but with some of the 

 ventral plates exposed. The fragment is 72 mm. long, stretched in a straight line, 8.5 

 mm. broad in the broadest part (near the middle of the fragment), from either side of which 

 it diminishes regularly and very slightly so as to be about 6 mm. broad at the segment 

 behind the head, and 7.5 mm. broad at the end of the fragment; it is largest and about 

 equally large from the fourth to the eleventh segment behind the head. The spines, the 

 lateral rows of which are exposed along either side of the body, are exactly similar in 

 structure in every particular to those of the preceding specimen, but are a little longer in 

 proportion to the width of the body than there, being 6 mm. long where the width of the 

 body is a little more than 8 mm. Signs of the position of some of the close approx - 

 mated subdorsal series may also be seen. Excepting at the hindmost end of the fragment, 

 the segments are everywhere scarcely half as broad again as their length. No legs are 

 visible, but on one side of the fourth (or fifth ?) segment behind the head is a straight, 

 equal, apically pointed, compressed, unjointed rod, carinate along the middle, as stout as 

 the stem of the spines, nearly three-fourths as long as the width of the segment on which 

 it is seated, and projecting from it at right angles (fig. 12). Probably, as in other cases to be 

 given in other species, it is the intromittent organ ; it is 5.75 mm. long and 0.6 mm. broad ; 

 as the first segment preserved is not unquestionably the head, the segment on which the 

 rod is situated is of course uncertain ; the reasons for supposing it to be the head are that 

 the body appears to terminate there, just before the edge of the stone, aud that the seg- 

 ment itself, while bearing no appendages, is, as is the case with the head in specimens of 

 other species of Euphoberia, more deeply impressed and extends further on one side than 

 on the other of the fossil. No characteristics beyond this can be made out. 



This species differs from the other of the genus in its greater size, and from the next, 

 to which it is most nearly allied, in its proportionally longer segments and in the more 

 extended development of the basal posterior spinules of the spines of the body, which in 

 this species are more widely separated from the main stem than usual. 



Euphoberia armigera Meek and Worthen. 

 PI. 12, figs. 1, 2, 3, 5, 6, 13 ; — pi. 13, figs. 7, 8, 10. 



Euphoberia armigera Meek and Worthen, Amer. Journ. Sc. Arts, (2), XLVI, 25-26 

 (1868) ; — lb., Geol. Surv. 111., Ill, 556-558 (pars), figs. C, D on p. 556 (1868) ; — Wood- 

 ward, Geol. Mag., VIII, 103-104, pi. 3, fig. 7, (1871). 



To this species I refer two specimens and reverses received from Mr. Carr, two others 

 with reverses from Mr. Armstrong, another with reverse from Mr. Bliss, another, also with 

 its reverse, from Mr. Worthen, a fragment sent by Mr. Pike, and the two figures C and D 

 of Meek and Worthen's illustration, though it is possible that fig. C may be distinct. 



