182 HISTORICAL PALAONTOLOGY. 
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 S¢gz//aria, and they belong to the genera 
Xylobius (fig. 124) and Archiulus. Lastly, the true zsects are 
Fig. 124.—Xylobins Sigillarie, a Carboniferous Myriapod. a, A specimen, of the 
natural size; 4, 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 /Vewropterous insects resembling 
those which we have seen to have existed towards the close of 
CZ = 
LEE PEL a = 
\ 
Wz 
Fis, 126.—Haplcpriediun Barnesi, a Carboniferous insect, from the Coal-mzasures 
of Nova Scotia. (After Dawson.) 
the Devonian period. One of the most remarkable of the 
latter is a huge May-fly (Waplophiebium Barnest, hig. 125),. with 
