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THE POPULAR SCIENCE MONT ELY. 



seen to do on some living Blattce ; and we can follow the anal vein, 

 which is nearly straight and extends almost to the end of the wing, 

 together with the axillary veins parallel to it. The remarkable feature 

 which distinguishes this impression from the wings of all other blattids, 

 living and fossil, is the length of the anal nervature and the scant width 

 of the axillary held. Among the blattids of the coal period, the Prog- 

 noblattina Fritschii (Heer) and the Gerablattina fascigera (Scudder) 

 have a nervation a little resembling that of our Silurian wing. We 

 propose to name this ancestor of the Blattce, Palceoblattina Douvillei, 

 in honor of Professor Douville. 



" Geologists regard as identical the sandstones of May and Jurques 



Fig. 5. Living Blattje, male and female (Bldbera claraziana), from Mexico. 



in the Calvados, and place them in the Middle Silurian, while the 

 schists of the Island of Gottland belong to the Upper Silurian. Our 

 blatta-wing, then, must be regarded as older than the scorpion described 

 by Professor Lindstrom and the other similar scorpion from the Upper 

 Silurian of Lanarkshire." 



Besides the engraving of the actual fossil wing in Fig. 3, we give 

 in Fig. 4 an ideal restoration of the same ; and in Fig. 5, for com- 

 parison, a representation of a living blatta from Mexico, the venation 

 of whose wings nearly corresponds with that of the fossil. 



