182 



HISTORICAL PALEONTOLOGY. 



but by forms in many respects very unlike any that are known 

 to exist at the present day. The most interesting of these 

 were obtained by Principal Dawson, along with the bones of 

 Amphibians and the shells of Land-snails, in the sediment filling 

 the hollow trunks of Sigillaria, and they belong to the genera 

 Xylobius (fig. 124) and Archiulus. Lastly, the true insects are 



Fig. 124. Xylobius Sigillarice, a Carboniferous Myriapod. a, A specimen, of the 

 natural size; b, Anterior portion of the same, enlarged ; c, Posterior portion, enlarged. 

 From the Coal-measures of Nova Scotia. (After Dawson.) 



represented by various forms of Beetles (Coleoptera), Orthoptera 

 (such as Cockroaches), and Neuropterous insects resembling 

 those which we have seen to have existed towards the close of 



Fig. 125. Haplophlebium Earnest, a Carboniferous insect, from the Coal-measures 

 of Nova Scotia. (After Dawson.) 



the Devonian period. One of the most remarkable of the 

 latter is a huge May-fly (Haplophlebium Earnest, fig. 125), with 



