i86 



HISTORICAL PALAEONTOLOGY. 



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

 netted wings attaining an expanse of fully seven inches, and 

 therefore much exceeding any . existing Ephemerid in point 

 of size. 



The lower groups of the Mollusca are abundantly represented 



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

 natural size ; 6. Anterior portion of the same, enlarged ; c. Posterior portion, enlarged. 

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



in the marine strata of the Carboniferous series by Polysoans 

 and Brachiopods. Amongst the former, although a variety of 



Fig. IZS.Haplophlebium Barnesi, a Carboniferous Insect, from the Coal-measures 

 of Nova Scotia. (After Dawson.) 



other types are known, the majority still belong to the old 

 group of the "Lace-corals" (Fenestellida}, some of the charac- 

 teristic forms of which are here figured (fig. 126). The graceful 

 netted fronds of Fenestella, Retepora, and Polypora(fig. 126 a) 



