Nevj Myriapods from the Palceozoic Rocks of Scotland. 117 



that of the first segment is small, and appears to be single, 

 and a little narrower than the head. It is 2 mm. deep, and 

 somewhat tumid, but could not have risen to the level of the 

 top of the head. In this respect, and in the manner in 

 which it is articulated with the head, it reminds one of the 

 corresponding segment in the Polydesmidae. The second 

 segment is also single, and similar to the first, only it is a 

 little deeper, and probably broader, but this cannot be 

 demonstrated, as one side of it is telescoped into the suc- 

 ceeding segment. The third and succeeding segments are 

 double, and in every respect similar to each other, with the 

 exception that they gradually increase in size till the sixth 

 is reached. Each consists of two tumid bands, separated by 

 a deep transverse furrow. The band in front is much the 

 smaller, is simple, and bears on its anterior edge the 

 smooth, narrow rounded facet by which it is articulated 

 to the segment in front. The hinder tumid band is larger 

 and much more swollen, and bears on its sides the foramina 

 repugnatoria, or openings of the "stink-glands," while its 

 posterior margin, where it folds downwards and forwards, is 

 raised into a strong ridge, which bears a row of circular 

 holes, which appear to represent the bases of spines that 

 had been broken off ere the remains were entombed in their 

 present matrix. The seventh segment is in every respect 

 similar to the sixth, both in dimensions and structure. The 

 eighth and ninth segments are crushed underneath the 

 seventh in such a manner as to prevent their study. The 

 sternal portions of the segments are not observable, and if 

 preserved in place are buried in the matrix. 



Limhs. — These have been all broken off from the segments 

 to which they were attached, and lie in a row, which begins 

 near the right side of the head, and stretches obliquely 

 outwards and backwards from it. The limbs seem to have 

 been in a very imperfect state before being imbedded, and, 

 owing to accidents during the freeing of them from the 

 matrix, in which they are firmly fixed, they have been still 

 more injured. From the fragments left, a good deal of their 

 character can be made out. One which lies farthest from the 

 head, and which, therefore, presumably belongs to one of the 



