MYRIAPODS OF XOVA SCOTIA. 239 



Mr. Woodward states that " the segments are marked by alternate ridges and furrows, and 

 the surface presents a somewhat rugose appearance, very different from the smooth and 

 shining articuh of the recent lulus," and again, " this shows the segments to have been 

 ornamented with transverse, finely undulating lines." If the cross Hues given in one of 

 Mr. Woodward's figm'es are correctly rendered, and represent the frustra into which the 

 segment is broken, we have an additional feature distinguishing the species, for these frustra 

 are far longer and narrower than those of X. sigillarice Daws., the most extreme of the 

 American species in this particular; the engraver has of coxu'se rendered the legs inac- 

 curately in making the tips furcate, since in all myriapods they are furnished with only a 

 simple claw; the length of the legs is another point of distinction, if we are to judge from 

 the plate, but as the description of these parts is so greatly at variance with the figures,^ 

 we will only draw attention to the necessity of examining this point more carefidly. The 

 British specimens seem to be much more perfect than any I have seen. 



It seems fairly deducible from the above detailed descriptions, that these fossil myriapods 

 compose a family of chilognaths, closely alHed to the lulidte, but distinct from any now 

 living, and to which the name of Archiulidce may be applied. They may be characterized 

 as having a cylindrical (or subcyhndrical ?) body of uniform size throughout the principal 

 portion, but tapering, at either extremity, to about half the dimensions of the central 

 portions of the body; they are composed of a large number of segments, not differing 

 greatly in character from those of lulidte, and furnished with lateral pores of a large size 

 from the seventh segment posteriorly ; the legs are attached in double pairs to the anterior 

 half of each segment posterior to the foin-th, and are not known to be present on segments 

 anterior to these ; the head is destitute of eyes, or, if furnished with them, the oceUar 

 tubercles are few in nmnber, and rather distant from each other ; the antennae are com- 

 posed of fom- (?) joints, very sunple in structure. The genus Xylohms may be defined 

 as an Archiulid, in which the segments — with the exception of those composing the 

 head and anal plates — are broken by sutures into fragments which may be termed frustra, 

 which run anteriorly and posteriorly across the segment; the segments themselves are 

 either slightly and regularly convex, or ridged anteriorly. The genus Archkdus closely 

 resembles Xi/lobius, but the segments are not bi'oken into frustra, and, in the single species 

 known, are prominently ridged on the anterior borders of the segment; the antennas are 

 divided into two nearly equal halves by a deep constriction between the second and third 

 joints. 



'Tlie figure represents the legs as nearly twice as long as " two lines across the widest, anfl one line across the narrow- 

 the width of the body, but the author states that the body is est segment," and that the legs are " one line in length." 



