Vol. 67.] FROM THE SOUTH WALES COALFIELD. 165 



the wing in this case was concealed by a leaf of Cordaites, and 

 others occur upon the same slab of shale. While Carboniferous 

 blattoids may have been wholly phytophagous, it is interesting to 

 note that all the leaves of Cordaites (in the present case) are 

 impressed with shallow pits, which show faint traces of a spiral. 

 I have, in very many previous instances, found that such pits 

 owed their origin to attached shells of Spirorbis pusillus. Whether 

 these leaves were partly submerged in water during life is an open 

 question ; but, in all cases, the plant-tissues of the pittings are 

 depressed, and are accurate impressions of Spirorbis. If the 

 Carboniferous blattoids were not wholly vegetable feeders, the 

 occurrence of Spirorbis pusillus upon the Cordaites may supply a 

 reason for their frequent association. 



The character of the wing-fragment is typically that of an Arehi- 

 mylacrid. It was undoubtedly broad, and the chief veins were 

 well defined, deep, and distinct in character one from the other. 



Horizon. — Gellideg Level of the Mynyddislwyn Vein, near 

 Maes-y-cwmmer (Monmouthshire.) 



Gerablattiija (Aphthoroblattina) sulcata, sp. nov. (PL VIII, 

 figs. 1-3.) [Reg. Nos. 24504 & 24505.] 



Greater part of a right tegmen. Under surface alone shown. 

 Only a short portion of the outer margin of the wing is preserved, 

 an estimated two-thirds of the middle, and a small portion of the 

 anal area. Although the wing is thus fragmentary, it is fortunate 

 that the parts preserved include the sub-costal angle and the 

 greater part of the base with slight evidences of attachment. 

 The inner sub-costal angle is much produced, bluntly rounded, and 

 very broad, forming apparently a full third of the width of the 

 base. The angle bends sharply inwards to the point of attachment, 

 a small portion of the latter forming a narrow ill-defined neck 

 projecting outwards from the middle of the wing-base. 



The anterior margin has the appearance of having been thickened 

 or infolded. The inner portion of the triangular sub-costal area is 

 smooth, and separated from the venated portion by an oblique 

 ridge arising near the base of the sub-costa, and passing obliquely 

 forwards and outwards to the margin. The sub-costa is thin, 

 elevated basally, and somewhat crenulated, doubtless owing to post- 

 mortem changes or pressure. Its course, so far as can be judged, 

 was parallel to the wing-margin, and in the portion exposed five 

 branching veins are shown, all of which fork very close to the 

 main stem. All the branches of the sub-costa pass out very 

 obliquely, pursuing a course which would indicate a sub-costal area 

 occupying nearly all the outer margin. The areas between the 

 veins are flat, except in the angles of the forks, where they become 

 convex. 



The radius follows a course parallel to the stem of the sub-costa, 

 up to the point at which it gives off the first forward branch ; 





