238 S. H. SCUDDER OX THE FOSSIL 



tions of eyes wMcli I have been able to find. There are, however, two fragments of anten- 

 nae ; one is broken and parted, and siniply indicates that the original was probably at least 

 .9 ™™' long, and in one place .2 ™"- broad ; the other is comparatively well preserved, and 

 shows thnt the fossil myriapod preserved in its maturity the simple form of antenna, now 

 characteristic of adolescence ; it seems to be 1.3 ""• long, and is composed of fom^ joints, 

 forming two parts somewhat similar in ajipearance ; the first and second joints together 

 have an oblong oval, well rounded outline, and rim in a nearly straight direction ; whUe the 

 third and fourth have a somewhat similar outline, but are a httle curved, lunate or reni- 

 form ; that is, the first and second are connate (or at least in no degree moniliform), as are 

 also the third and fourth, while a deep constriction nearly divides the second and third ; the 

 exact shape of the first cannot be determined, but it appears to be a little larger at the apex 

 than at the base, and about as long as its extreme width ; ' the second is docked squarely 

 at the base, and is of equal width for a short distance, when it tapers gradually to a well 

 rounded apex, where it imites with the thu'd ; it is .4 ™"- long, .3 ™™- broad at the 

 base, and .1625 ""• broad at the tip ; the third, which forms almost the whole of the outer 

 half of the antenna mentioned above, is .6 ™™' long, and .375 ""• in extreme breadth ; it is 

 broadest in the middle, and tapers toward ' either end, being .15 """■ broad, where the mi- 

 nute apical joint is connate with it ; the fourth, or apical joint, is but .1 ™™' in length, only 

 servuig to round off the tip of the antenna ; were it not for the deep constriction at the 

 middle of the antenna, this organ would closely resemble the representations of the young 

 lulus given by Newport ; the surface of the whole antenna seems to be marked with very 

 minute, irregular, raised points, not crowded together. 



I ought here to speak of the remains referred doubtfully by Dawson to a labrum ; they 

 are situated next to the head, but are equal to it in size, and seem to be three or four 

 connected segments of the abdomen of some orthopterous or neuropterous insect ; their 

 whole length is 2.15 '"°'-, and they vary from 1.1 °™- to 1.45 "''"• in breadth. 



Mr. Henry Woodward, of the British Museum, in an article printed in the Transactions 

 of the Geological Society of Glasgow,^ has announced the first discovery in Great Britain 

 of a species of Xylohius ; having examined specunens from Kihnaurs, Ayrshhe, and from 

 Cooper's Bridge, aaear Huddersfield, he states that he does not " think the specimens of 

 this fossil entitle us to consider it as specifically distinct from that discovered by Dr. Daw- 

 son, although a comparison of the figures may convey that impression." The illustrations 

 of the Enghsh specimens given by Mr. Woodward differ so greatly from each other, that 

 one would ahnost feel justified in beheving they belonged to two distinct species ; I would 

 hardly hazard such an opinion without a comparison of the specimens themselves, yet I 

 cannot believe that they belonged to any species I have had before me, unless the illustra- 

 tions greatly misrepresent the comparative length and breadth of the segments ; in these 

 drawings the segments are half as long as broad ; in the Acadian species they vary from a 

 proportion of 1 to 3.05 to that of 1 to 5.574. I am convinced, both from this and from sim- 

 ilar differences, that the British species — if there be only one — must be distinct from any 

 of the American ones, and I therefore propose for it the name of Xylohius WoodwarcK. 

 That the Enghsh specimens belong to Xylohius, and not to Archiuliis, is probable, for 



1 There may be more than one joint at this place, although 2 YqI. u^ pt, i;;, pp. 934-248. 



one only can be seen. 



