PLATE I. 



FIG. PAGE. 



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

 Middle Coal Measures (horizon not known) ; Ravenhead Railway 

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



Ib. Ditto; impression of the wing. X 1J- 25. 



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

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

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



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



Coll.), no. 30223. 27. 



3ft. 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 Claypit, 

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



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



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



4a. Hypermegethes nortkumbrix, Bolton ; basal half of a left wing. X 1^. 

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

 Crawcrook, Durham. British Museum, no. In. 18524. 32. 



46. 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. 



