432 SAMUEL H. SCUDDER ON NEW 



is a young specimen, and here the spines appear to be erect with no backward sweep 

 and to be nearly or quite as long as the width of the body; only a dozen segments are 

 preserved and the sjjecimen, very imperfect, is only 17 mm. long and 1.75 mm. in diam- 

 eter. 



Euphoberia simplex sp. nov, 

 PI. 35, figs. 2, 6, 7. 



A couple of specimens of sjiined Archipolypoda differ so much from the others I 

 have described, that they seem better separated from them. By their slender forms 

 they agree best witli the two species which follow, while in their size and armature they 

 agree better with most of those that precede. 



The first and best specimen (fig. 2) shows the whole of a myriapod extended with a 

 gently sinuate curve ; it presents a lateral aspect. The head is a little larger than the 

 immediately succeeding segment, but is very poorly preserved, and shows no appen- 

 dages. The segments of the body are thirty-seven in number, increase rather rapidly 

 in size on the anterior six, the size then attained being retained up to the third or fourth 

 before the hinder end when they taper similarly, the last segment being bluntly rounded 

 and about as large as the head; excepting where tapering, the segments are a little less 

 than twice as broad as long, and are separable into a shorter anterior and a longer and 

 moi"e elevated postei-ior subsegment, at the anterior part of the latter of Avhich the 

 spines are seated. These are arranged as usual in the genus, and the subdorsal series 

 consists of nearly simple, short and pointed, arcuate spines, barely or not half so long 

 as the segments, with a posterior basal spinule arising faintly from a sort of heel to the 

 spine, often very inconspicuous and not shown on the plate ; in texture, the upper sur- 

 face appears to be finely granulated, while the lower plates show a fine punctuation, the 

 punctae transversely elongated. The legs are very well preserved, in many places 

 showing well the division into joints and the median longitudinal carina; the second 

 joint is usually just about as long as the subequal remaining three; they are strongly 

 compressed laterally, and most of the tapering occurs on the apical joint; their surface 

 is smooth but not polished. 



Length, 91 mm.; breadth in middle, 4.5 mm.; length of middle legs, 3.75 mm.; of long- 

 est spines, 2 mm. 



Mazon Creek, III. Mr. R. D. Lacoe, No. 1812ab. 



A second less perfect but interesting specimen from the same place (fig. 7) is simi- 

 larly preserved on the stone but with the hinder end drooping and possibly not quite 

 complete. The head is better preserved than in the preceding specimen, much larger 

 than the immediately succeeding segments, well rounded, a little longer than broad, 

 and shows a few obscure antcnnal joints (fig. G) ; they are only three or four in num- 

 ber, subequal in length, but narrowing slightly, and all together not more than half as 

 long as the head. The body is sul^equal almost thoughout, scarcely showing any signs 

 of tapering in front, Avhile the specimen is too imperfect behind to determine that point. 

 There are about thirty-three segments which are only about half as broad again as long. 

 mo spines can be certainly made out, but nearly all the legs are preserved, though ob- 



