436 SAJIUEL H. SCUDDER ON NEW 



rowly confined as in the specimen before found; the segments vary in their proportions 

 very mnch as in the original, though they appear to be relatively shorter next the hinder 

 end. The legs are poorly i)reserved, but can be seen throvigh all but the front end of 

 the body to be shorter than the width of the body, especially in its widest portion, and to 

 be rather stout, slightly tapering and blunt tipped. No spines are clearly seen, but 

 their presence on the subdorsal region is indicated by obscnre marks, which in no way 

 dijffer from the few seen in the type. The specimen is about 53 mm. long and comes 

 from Mazon Creek, Morris, 111., where it was obtained by Mr. F. T. Bliss. It bears the 

 nnmber 131 in my collection. 



Still another specimen of what appears to be this species has been sent me by Mr. R. 

 D. Lacoe. Both faces of the nodule show the specimen about equally well or rather ill. 

 It is indeed so faint that no attempt has been made to have it drawn. Like the orig- 

 inal it is preserved on a dorsal -sdew in a curved position, the front two-thirds pretty 

 strongly bowed, the hinder third bent at right angles to the part in front and curved or 

 roinidly bent in the same sense. The whole animal appears to be preserved and it diliers 

 from the ty^je only in tapering a little more rapidly and in having the posterior extrem- 

 ity extended almost to a point. If extended its length would be about 35 mm. ; its 

 breadth at greatest behind the head, 2.5 mm.; and in the middle of the body, 1.75 mm. 

 The segments are too indistinct in many parts of the body to be counted, so that the 

 total number cannot be compared with that of the type, but just behind the head the 

 segments appear to be just about twice as broad as long, and in the middle of the hin- 

 der half they are proportionally but little longer than in front. The tapering of the 

 body is almost entirely confined to the hinder half, and at the extreme tip the body is 

 less than 0.25 mm. broad. Nothing can be told from this specimen any more than from 

 the first known concerning the structure of the spines or legs, luiless certain marks at 

 the sides of this, near the middle, indicate legs; these would then be exceedingly slender 

 and fully as long as the width of the body. 



Mazon Creek, 111., nodules. No. 1807cd. 



Family Archiulidae Scudder. 



Archiulus Scudder. 



Several species are now known to me from North America, besides those here de- 

 scribed which are somewhat problematical from the natiire of their entombment. Others 

 from the sigillarian stumps of Nova Scotia will be described on another occasion. 



Archiulus? glomeratus sp. uov. 

 PI. 37, figs. 2, 3. 



A closely coiled, moderately large galley-worm (fig. 2) is doul^tfully referred to this 

 genus, though much larger than any heretofore found, because its well pi-cserved seg- 

 ments show no sign of any division into frustra and no indication of spines or any lon- 

 gitudinal series of prominences. Eighteen or nineteen segments are preserved, all but 



