PLATE I. 



Fiu. PAGE. 



I**. Dictyoneura h'njij'nixii (Handlirsch) ; basal portion of left wing, x 1^. 

 Middle foal Measures (horizon not known) ; Ravenhead Railway 

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



\li. Ditto; impression of the wing. X H. 25. 



'In. Orthocosta xjih'ixli'ii*, Bolton ; left whig. Natural size. .Middle Coal 

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

 Ilkeston, Derbyshire. Mns. Pract, Ceol. (Moysey Coll.), no. 30222. '27. 



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



Coll.), no. 30223. 27. 



3a. I'lrrn/iiiJi/i plicatula, Bolton; inner half of left wing, x H-. 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. :!<. 



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



nervures. X H. M"us. Pract. Geol. (Moysey Coll.), no. :)0225. 30. 



4<i. Hypermegetkes ii<-flriiiii/u-!;r, Bolton; basal half of a left wing. X 1^. 

 Coal Measures (shale above the Crow Coal); Phoenix l>rick\vorks, 

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



4^. 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|. ; >2. 



