Plate IV. 

 All the drawings are hy J. Henry Blake. 



Pig. 1. Amynilyspes ? sp. ^. 



2. Amynilyspes 1 sp. i 



3. Archiulus lyelli, a few contiguous segments, -f. 



4. Aroliiulus xylobioides, part of a single segment, -|. 



5. Archiulus euphoberioides, the largest fragment, ^. 



6. Archiulus euphoberioides, a few contiguous segments, f. 



7. Archiulus lyelli, the largest fragment, -f. 



