. THE CHAIN OF LIFE. 



„=,= found in the Coal-formation of Scotland. 1 lie may mc 

 7riw<^) are represented in the Carboniferous by several 

 tffrg Secies. 'Xhat of which the wing is shown in Fig 

 rJ mi!t have been seven inches in expanse of ^vmgs The 

 habitrof the modem May-flies show us how animals of thij 



F,a. ,„._Wing.of Cockro^h... From the Coal-focmauon. 



a. ArcMmulMns -^'«^«''J_<^"Xm (S>;udd.r). 



.roup living as larv:e in the streams and lakes must have 

 Sd l4 supplies of food to fishes, and when mature 

 must have emerged from the waters m counttes my™^ ■ 

 filling the air for the brief term of their existence in the per 

 feet ftate. A single specimen, found in the Coal-Seld of Cape 

 Breton is recognised by Scudder as the larva of a Dragon-fly 

 mg x'.Q), and he informs us that this predaceous and beau- 

 'I'tre-Ae hawks of the class /««^.-flitted on the ba.k 

 of Carboniferous streams. These two famihes of May flies 



