MYRIAPODS OF N^OYA SCOTIA. 237 



it measured 4.25 ""^■, aud at a distance of 7.5 """•, 3.25 ■"""•; at 5 °"°- from the head it 

 measured 2.5°™' (the average breadth at this point is 2.375"'"), and next the head 

 1.62 °"-. One specimen, closely coiled, the body of which at its widest part was 2.75 "™- 

 in breadth, measured 4.625 ""■ across the coU. Beneath, there is a faintly impressed hne 

 along the middle of the body, on either side of which the lines of divisions of the seg- 

 ments are inclined a little posteriorly. The segments are shaped much as in X. Dawsoni 

 Scudd., but are not broken up into frustra ; the anterior ridge is more prominent, and oc- 

 cupies a greater extent of each segment in the anterior part of the body, and especially in 

 the first seven segments, than in the posterior part ; aud when the body is coiled, the 

 hinder edges of the segments project strongly above the adjouiing ring, much as it is rep- 

 resented in some of Dr. Dawson's illustrations ; other fragments show that the lower 

 edges of the segments were well rounded posteriorly ; the segments are proportionally a 

 Httle longer close to the head than in the middle of the body ; in general they vary in 

 length from .8 """• to 1.5 °™-, averaging 1.28 """• (but one segment, near the head, in a 

 small specimen, measured only .475 °™-), while the breadth varies from 1.62 ""• to 4.5 °"°- ; 

 the average length of the segment to the breadth is as 1 : 3.05; the ridge occupies from 

 one-fifth (in the middle of the body) to nearly nine-twentieths (near the head) of the en- 

 tire length of the segment. In some specimens, which seem to be a httle worn, the sur- 

 face is perfectly smooth, but in others the altered integument is apparently marked with 

 broad, shallow, circular, tessellated pittings, the centres of which are .0875 ™^ apart ; 

 there are fine, jjaraUel, longitudinal hues on the segments, varying from .04 """■ to .2 ™™- 

 apart ; those on the under surface, or on the lower portion of the sides of the segments, 

 seem to be in closest proximity, but the lines on the upper surface are sometimes not more 

 than .875 ""• apart. 



The foramina repugnatoria are more distiuctly preserved in some specimens of this spe- 

 cies than ia any of the other fragments of fossil myriapods which I have examined ; they 

 occur from the seventh segment backward (I could not determine how far, but at least to 

 the seventeenth segment), and are placed in the middle of the sides of the segments ; 

 they are oblong oval in shape, with their longer diameters vertical ; the mean of their di- 

 ameters averages .2 °™-. A specimen of the under surface seems to show that the legs are 

 inserted close together, one a httle outside the other ; together they are placed in the 

 middle of the anterior half of the segment, and about midway between the ventral line 

 and the outer edge ; they vary in length according to their position on the body; on the 

 fiifth segment, where they commence, they are from 1.35 °""- to 1.8 °™' long, while at the 

 middle of the body they measure from 1.75 "'"• to 2 ""'• long ; at the base they average 

 less than .1 """■ broad. 



I cannot determine whether the animal had any eyes, but the tubercles delineated by 

 Dr. Dawson cannot be considered as such, for an examination of his original specimen 

 shows, as his illustration itself indicates, that these tubercles are placed in the segment 

 behind that which shoidd bear the eyes ; and, moreover, similar tubercles may be seen on 

 other segments, and indeed on other parts of the stone where there are no organic re- 

 mains ; in another spot, close to the base of the antennte, and exactly where Newport rep- 

 resents the eye of the immature lulus, two or three minute tubercles, .0167 ""■ in diame- 

 ter, are situated close together at the upper edge of an abrupt pit in the stone, which — if 

 these are parts of the eye — has engulfed the rest ; these are the only possible indica- 



