On some Fossil Myria'pods from Forfarshire. 183 



backwards, diminishing to half its breadth in the space of 

 sixteen segments. The somites are smaller and larger 

 alternately, the smaller being anterior to the larger. The 

 dorsal scutes occupy about two-thirds of each body ring. Those 

 of the larger somites, with the exception of those near the 

 tail, are produced laterally into broad expanded lobes or 

 lateral lamellae, which extend outwards to a distance of half 

 the breadth of the body of the segment itself, and are directed 

 slightly backwards. These lamellse in the fossil state show 

 a more or less circular depression, probably due to their 

 collapsing. The backs of the dorsal scutes of these segments 

 are further ornamented with a double row of papillae, which, 

 in all probability, supported spine-like hairs. When the 

 body begins to diminish towards the tail, the lateral lamellae 

 appear to decrease also, and seem to disappear altogether 

 from the last few segments. The smaller segments bear no 

 lateral lamellae, and are mere rings interposed between the 

 larger to allow of flexibility. Sternal plates not observed. 

 The legs, of which there is a pair to each segment, whether 

 large or small, are stout and flattened, and are a little longer 

 than the breadth of the segment to which they are attached. 

 They are made up of six or seven subequal joints, the 

 second from the body being slightly the longest and most 

 depressed. They end in simple claws, and two or three 

 spines are given off at the distal articulation of each joint. 



The head, in the only case where preserved, is seen from 

 above and is pyriform with its wider end turned backwards. 

 It is divided into at least two areas by a constriction or 

 sulcus, which passes in from each side, and becomes almost 

 lost in the mid line. The hinder area bears two swollen 

 cheek-like prominences at its posterio-lateral sides. Upon 

 these prominences are several small tubercles which appear 

 to be the eyes, the position of which they occupy when such 

 are present. Six tubercles are seen on one side, and there 

 have been more which are now crushed. In front of these, 

 crescent-shaped tuberculated ridges partially encircle the 

 depressions, out of which the antennae take their rise. 

 Only one joint of the right antenna is visible, while two 

 joints of the left can be made out, the second joint being 



