310 MR. H. BOLTON ON IXSECT-REiTAIXS FROM [Sept. I912, 



16. Insect-Eemaos from tlie Midland and South-Eastern Coal 

 Measures. By Herbert Bolton, P.R.S.E., F.G.S., Reader in 

 Palaeoutolog}^ in Bristol University and Director of the Bristol 

 Museum. (Read May 1st, 1912.) 



[Plates XXXI-XXXIIL] 



I AM indebted to Dr. L. Moysey for the opportunity of describing 

 an interesting series of insect-wings obtained by him from the 

 Shipley Clay-pit, about a mile and a half north of Ilkeston (Derby- 

 shire). They formed a part of a valuable and interesting suite of 

 remains, most of which have been already described by Dr. Moysey.^ 



The material in which the insect-wings are found is greyish- 

 brown ironstone occurring in the form of nodules, which lie in 

 bands in a yellow clay, probably about 30 or 40 feet below the Top 

 Hard Coal (op. cit. p. 506). The nodules also contain comminuted 

 fragments of plants. 



I am indebted to Dr. Malcolm Burr, M.A., for the opportunity of 

 examining the Coal-Measures cores from the Kent Coal Concessions 

 Company's bores in the east of Kent, during which examination I 

 found the blattoid wings and other wing-remains which are described 

 later in this paper. 



Orthocosta splendens, gen. et sp. nov. (PI. XXXI, figs. 1-3.) 



Only a portion of the wing is preserved. It has a length of 

 84 millimetres, and a width from the outer to the inner margin of 

 33 mm. The complete wing must have had a length of not less 

 than 100 mm. (4 inches) and a width of 35 to 40 mm. The increased 

 breadth given to the wing takes into account a slight inflexion 

 of the costal margin. The whole insect had in all probability a 

 span of wing measuring 25*5 centimetres (10 inches or more). 



Description. — The outer third of the wing is diff'erentiated 

 from the rest by its uniform and gentle convexit}', and by the 

 character of the costal, subcostal, radial, and median veins, which 

 pass outwards towards the wing- apex in straight lines, and show 

 no trace of division until well beyond the middle of the wing. 

 All the veins stand out in relief in the outer third of the wing, 

 and contrast strongly with the areas occupied by the marginal 

 divisions of the median, cubital, and anal veins. 



The inner two-thirds of the wing is marked by deep sulci, in 

 which lie the marginal branches of the median vein, the whole 

 course of the cubital vein, and the veins which occupy the anal 

 area. The areas between any two veins in this region are 

 markedly convex. The differences in character of the outer and 

 inner portions of the wing are emphasized by a line of fracture 

 which fairly accurately separates the two. Its occurrence would 



1 Geol. Mag. dec. 5, vol. viii (1911) pp. 497-507. 



