172 S. H. SCUDDER ON SPINED MYRIAPODS 



joints ; the whole is however very problematical. The segments are difficult to determine 

 from the doubled position of the fossil, but there are apparently only twenty-eight of them • 

 in all excepting the broadest part of the body they are twice as broad as long ; there, they 

 are a little more than twice as broad as long ; the anterior half is transversely ridged and 

 bears the spines, while the posterior half is flattened. The segments in the posterior portion 

 of the body show a very faint, rather coarse and distant, scarcely noticeable granulation, 

 but it is not elsewhere visible. 



The subdorsal rows of spines are a little nearer to each other than either of them are 

 to the lateral rows, as indicated by the pits; the only spines that remain are a few of the 

 subdorsal series, near the front and again at the hinder end of the body, all of which are 

 simple, straight, regularly conical, bluntly pointed, and directed backward ; they have no 

 subsidiary spinules, and are less than half as long as the width of the segments on which 

 they are seated ; a single one of the spines (PI. 12, fig. 11) appears double and forked ; it 

 is probably due to the accidental presence of a broken spine. The spines originate near 

 the front of the anterior ridged part of the segments. A few legs may be seen scattered 

 along one side of the hinder portion of the body ; none of them are perfect, and all that 

 can be said of them is that they are slender (PL 12, fig. 10), flattened and tapering, with a 

 median carina, at least on the basal portions ; they are fully as long as the width of the 

 segments to which they are attached ; the longest fragments, apparently showing the tips 

 in natural position, are 2.6 mm. long and 0.25 mm. broad, the segment to which they 

 belong being 2.25 mm. broad. A few legs may be seen depending from the anterior part 

 of the body (PI. 12, figs. 14,15), and have special interest as certainly appendages of the 

 first and second segments behind the head ; one is attached to the hinder part of the first 

 segment, leaving ample room for another in front of it, and there is an obscure appearance 

 of the base of such a .leg at its proper place, having the same form and general directiou 

 as the hinder one ; in addition there is a third leg at the anterior edge of the second seg- 

 ment of exactly similar appearance ; these legs are perhaps imperfect, but they are as 

 lono- as the width of the segments at this point, compressed, tapering, straight and of 

 moderate stoutness, with a slight indication of a median carina ; joints cannot be made 

 out ; they are 3 mm. long and 0.5 mm. broad at base. 



The third specimen (PI. 13, fig. 16) also represents the entire animal, bent in the middle 

 and showing a partially side view, so that the legs appear on one side and the spines on the 

 other. There are from thirty to forty segments besides the head, the exact number being 

 indeterminable ; the larger part of the body includes the first sixteen segments ; with the 

 seventeenth the body begins to taper considerably for several segments, and then narrows 

 very gradually to the hinder extremity, which is only a very little more than half as broad 

 as the broadest part ; in the broadest part the segments are rather more, in the narrower 

 part somewhat less, than twice as broad as long. The specimen is 48 mm. long, 3.25 mm. 

 broad in front, and 2 mm. broad behind ; in some places the surface appears to be closely 

 and rather minutely granulated. The only spines preserved are some of those of the sub- 

 dorsal row on the wider part of the body, where they are slender, conical, pointed, curved 

 backward, as long as half the width of the body, generally furnished with a minute ante- 

 rior spinule about the middle of the spine, which is directed upward or scarcely forward ; 

 the spinule is not half so long as the thickness of the middle of the spine, and is indeed 



