PLATE I. 



Fig. Page. 



la. Dictyoneura higginsii (Handlirsch) ; basal portion of left wing, x 1^. 

 Middle Coal Measures (horizon not known); Ravenhead Railway 

 Cutting, nr. St. Helens, Lancashire. Liverpool Museum. 25. 



1 h. Ditto; impression of the wing. X 1^. 25. 



2ft. Orthocosta splendens, Bolton; left wing. Natural size. .Middle Coal 

 Measures (below the Top Hard Coal) ; Shipley Manor Clay pit, 

 Ilkeston, Derbyshire. Mus. Pract. Geol. (Moysey Coll.), no. 30222. 27. 



2//. Ditto; impression of the wing. Natural size. Mus. Pract. Geol. (Moysey 



Coll.), no. 30223. 27. 



3a. Pteronidia plicatula, Bolton; inner half of left wing, x 1^. The 

 straight inner margin and the plication are well shown. Middle 

 Coal Measures (below the Top Hard Coal) ; Shipley Manor Clay pit, 

 Ilkeston, Derbyshire. Mus. Pract. Geol. (Moysey Coll.), no. 30224. 30. 



3b. Ditto; impression of portion of the wing, showing the oblique cross- 



nervures. x 1^. Mus. Pract, Geol. (Moysey Coll.), no. 30225. 30. 



4a. Kypermegethes horthumbrix, Bolton; basal half of a left wing. X 1-|. 

 Coal Measures (shale above the Crow Coal) ; Phoenix Brickworks, 

 Crawcrook, Durham. British Museum, no. In. 1S.~>24. 32. 



4<b. Ditto ; counterpart of portion of basal half of the wing, the interstitial 

 neuration having been rendered visible by immersion of the nodule 

 in water during photography. X 1|. 32. 



