124 Proceedings of the Royal Physical Society. 



straight forward, and seem to increase in breadth as they 

 recede from the head, and each joint is broadest at its distal 

 extremity. The left antenna is bent back upon itself at 

 the second joint, and appears to be complete, though its 

 extremity seems to be hid underneath one of the walking- 

 limbs. It appears to be made up of six joints, and to be 

 constructed like that of the recent Millepedes, the joints 

 being short and thick, and narrower at the bases than at the 

 extremities. 



Body. — The body segments, of which twelve are seen 

 attached together, appear all to be formed after the same 

 manner — those nearest the head are the narrowest. They are 

 all produced into lateral lamellse, which exhibit similar 

 depressions to those seen in Archidesmus Macnicoli, as de- 

 scribed by me, and are sculptured with a minute granulation, 

 and furrowed by short sub-parallel wrinkle-like markings, 

 arranged transversely to the length of the body. The dorsal 

 scutes of four more rings detached from the body, and also 

 from each other, occur embedded in the matrix. One of 

 these lies just behind and a little to the right of the twelfth 

 segment, while the three remaining ones lie to the left of the 

 specimen, as if they had been carried forward by a current 

 as the animal gradually decomposed before being finally 

 covered up by sediment. 



Limbs. — Several legs are seen to be still attached to the 

 left side of the anterior part of the body. They are each 

 longer than the breadth of the larger segment preserved, and 

 appear to be constructed like those of the recent Polydesmus, 

 which they greatly resemble, though they are somewhat 

 larger in proportion to the body. In their present flattened 

 state they appear nearly as broad, and, in some cases, even 

 broader than the segment to which they seem to be attached, 

 and were doubtless compressed laterally during life. Portions 

 of four limbs are seen on the right side. Two of these appear 

 to be attached to segments next the head, while two still 

 more fragmentary ones are seen to emerge from beneath the 

 eleventh and twelfth segments. The study of the two limbs 

 next the head, which are composed of joints much shorter 

 than any of the limbs seen on the left side, and those of the 



