GERONEURA (?) OVATA. 77 



subcosta short and joining outer margin before middle of wing. Radius and 

 radial sector occupying almost the whole of the wing-apex. Median, cubitus, and 

 anal divisions few. Interstitial neuration of stout cross-nervures at wide intervals. 



Geroneura (?) ovata, sp. nov. Plate V, fig. 1. 



Type. Portion of left wing; British Museum (Madeley Collection, no. I. 2965). 



Horizon and Locality. Middle Coal Measures (binds between the "Brooch" 

 and " Thick " coals) ; Coseley, near Dudley, Staffs. 



Specific Characters. Radial sector rising in outer third of wing, with three 

 divisions. Median vein large, the two outer branches forking in line with origin 

 of the radial sector, the third branch undivided. Cubital veins few, undivided, and 

 reaching the distal part of the inner margin of the wing. 



Description. The specimen consists of the impression of the upper surface 

 of the distal portion of a left wing, having a length of 32 mm., and a breadth of 

 20 mm. The impression lies on the surface of a thin flattened half-nodule of fine 

 sandy grit, and is but faintly indicated. The total length of the wing was 

 probably from twice to three times the length of the portion preserved, and its 

 breadth may have been a little more than 20 mm. The outer margin is gently 

 convex, and curves into the broadly rounded apex. Very little is left of the inner 

 margin, which also seems to have been convex. The distal portion of the costal 

 margin is present for a length of 20 mm. There is no trace of the subcosta, so 

 that this vein did not extend much, if at all, beyond the middle of the wing. The 

 radius gives off the radial sector about the distal third of the wing, the two veins 

 remaining almost parallel with the wing-apex. The radial sector gives off a single 

 inward forked vein. The next three veins seem to be divisions of the median. 

 The first two each give off an outer branch in line with the division of the radius 

 and radial sector, and the outer of the two also forks before reaching the edge of 

 the wing. The third vein is single for its whole length, but evidently united with 

 the second a short distance outside the line of fracture of the nodule. The 

 remaining four veins appear to belong to the cubitus. No anal veins are 

 distinguishable. All the veins, with the exception of the small forks of the 

 radial sector and first median, are parallel and widely spaced. They are united by 

 a series of strong, straight cross-nervures placed widely apart. Notwithstanding 

 the strength of the veins and of the cross-nervures, the smooth impression of the 

 wing-fragment seems to indicate that the veins were not sunk below the general 

 surface of the wing, as is usually the case. 



Affinities. The determination of the relationship of so small a wing-fragment 

 would be difficult were it not for the unusual direction of the main veins, their 

 mode of branching, and the character of the cross-nervures. These characters are 

 a special feature of the order Mixotermitoidea, Handl. 



