PLATE X. 



Fia. Page. 



la. Boltonites radstochensis (Bolton); basal portion of the wing, x 2. 

 Upper Coal Measures ; Tyning Colliery, Radstock, Somersetshire. 

 Sedgwick Museum, Cambridge. 140. 



lb. Ditto ; proximal portion of costa and subcosta, showing the tubercular 

 anterior edge, and the backward slipping of the costa over the sub- 

 costa. X 4. 140. 



lc. Ditto; distal portion of the costa and subcosta, showing the spinous 

 anterior border of the former, the cross-branches uniting the two 

 veins, and a median line of tubercular ornament on the subcosta. 

 X 4. 140. 



1 (/. Ditto ; proximal portion of the inner margin, showing the development 



of stout submarginal spines. X 4. 140. 



Ae. Ditto; more distal portion of the inner margin, showing the submarginal 



spines. X 4. 140. 



2. Tillyardia multiplicata, gen. et sp. nov. ; impression of the under 



surface of right wing. X 1J. Upper Coal Measures; Barony Pit, 

 Auchinleck, Ayrshire. Mus. Geol. Surv. Scot., no. T. 4098 b. 145. 



3. Arcldmylacris pringlei, Bolton ; basal two-thirds of fore-wing. X 4. 



Upper Coal Measures (Keele Group) ; Slang Lane, Wellington, 

 Shropshire. Mus. Pract. Geol., no. 30725. 146. 



