ADDENDUM. 



147 



is flatly convex over the greater part of its length, and well rounded at the base 

 of the wing. The subcosta is parallel to and widely spaced from the outer margin, 

 to which it sends eight or nine branches, two of which are forked, and one, the 

 most distal, is not fully developed. The radius is not complete, and has but a 

 slight divergence from the subcosta. It gives off the radial sector at a point 

 between the seventh and eighth branches of the subcosta. The radial sector goes 

 out to the wing-apex, sending its branches forward to the outer margin. The 

 median diverges a little more from the radius than the latter from the subcosta. 

 Portions of three inner branches are present. The cubitus is a convex vein 

 passing well out to the distal end of the inner margin of the wing, and giving off 

 a series of widely separated inward branches, of which four are present on the 

 wing-fragment preserved. Owing to the forward displacement of the anal portion 

 of the wing, the first branch of the cubitus passes under the first anal vein. The 

 second shows a simple fork, and the remaining two veins end undivided on the 

 line of fracture. Portions of six anal veins are present, the first obscure and 

 the rest parallel. The interstitial neuration consists of a compact series of close- 

 set transverse nervures, which in the basal areas between the radius, median, and 

 cubitus unite laterally and irregularly until they form a coarse irregular meshwork. 



Affinities. The widely spaced subcosta and the character of the interstitial 

 neuration of the wing show a close relationship to that of two forms of Archimy- 

 lacris (A. desaillyl and A. lerichei) recorded from the Coal Measures of Lievin, 

 Northern France, but, as the accompanying tabulated comparison will show, the 

 wing is nevertheless specifically distinct from either. 



Observations. The presence of this fossil Blattoid in the Keele Group of the 

 Upper Division of the Coal Measures of Shropshire, and its specific relation to 

 forms known only from the Westphalian Series of Lievin, Northern France, is a 

 matter of considerable interest, especially as Dr. Pruvost, of Lille, had previously 

 drawn attention to the fact that the fauna at the top of the Coal Measures in 

 Great Britain (Keele Group, Newcastle-under-Lyme Group, Etruria Group) does 

 not notably differ from the fauna at the top of the Westphalian in Northern 

 France. 



A. pringlei, Bolton. 

 Costal Area : 



Strap -shaped, widely spaced 

 from wing-margin. 



Subcostal Vein : 



Numerous divisions, mostly 

 forking. 



19 



TABULATED COMPARISON. 

 A. desaillyi, Leriche. 



A. lerichei, Pruvost. 



Strap-shaped, widely spaced Outer third oblique to wing- 



from wing-margin. 



Numerous divisions, mostly 

 forking. 



margin. 



Few divisions, much branched. 



