Plate V. 



All the draioings are hy J. Henry Blake. 



Fig. 1. Xylobius similis, ^; three segments fi-om just in front of the 

 middle of fig. 2, fui'ther enlarged and shown in outline. 



2. Xylobius similis, ^ ; see also fig. 1. 



3. Xylobius dawsoni, |-. 



4. Mazonia sp., ^ ; the anterior portion is below. 



5. Mazonia acadica, ^. 



6. Mazonia acadica, |^. 



7. Perhaps a part of the inferior ? alxlominal surface of a 



Mazonia, U*. 



8. Mazonia sp., perhaps acadica, ^. 



9. Mazonia sp., perhaps acadica, ^. 



