JDr. S. Woodward — British Carboniferous Cochroaches. 51 



upon tlie anterior margin. The ' interno-median ' and ' anal ' take 

 the ojDposite course, and their branches are inferior, or, at least, 

 directed towards the inner margin ; while the ' externo-median,' 

 which is interposed between these two sets, terminates at the tip of 

 the wing, and branches indifferently on either side." 



Anterior 



or 

 superior 

 margin. 



Posterior 



or 

 inferior 

 margin. 



'-^•fiOTu.-''^' 



Fig. 3. — Schematic view of left wing of Palaeozoic Cockroach, showing the veins 

 and areas (after Scudder). 



" Now these veins are all present in both front and hind wings of 

 Palasozoic Cockroaches, and also in the hind wings of existing species ; 

 but in the front wings or tegmina of the latter, the number is never 

 complete, the externo-median vein being always amalgamated either 

 with the scapular, or with the interno-median, and the mediastinal 

 frequently blended with the scapular vein" (Scudder). 



The following is a list of the genera and species of Blattid^ from 

 the Carboniferous formation hitherto described, arranged under the 

 families and genera suggested by Scudder. 



Pal^eoblattari^. 



MylacridcB — 



Mylacris bretonense, Scudder, Coal-measures, 



„ Seerii, Scudder, ,, 



,, pennsylvanicum, Scudder ,, 



,, Mansfieldi, Scudder ,, 



,, anthracophiluin, Scudder ,, 



,, antiquum, Scudder ,, 



,, lucifugum, Scudder ,, 



,, carbonum, Scudder ,, 



,, ovale, Scudder ,, 



,, priscovolans, Scudder ,, 



Sydney, Cape Breton. 



Cannelton, Penn. U.S. 



)> )> 



Colchester, Illinois, U.S. 

 Port Griffith, Pittston. 



Cannelton, Penn. U.S. 



