S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 103 



The wing is peculiar for the longitudinal direction of the branches of the mediastinal and 

 internomedian veins, and also for the simplicity of the scapular and externomedian branch- 

 ing ; the latter, indeed, is only inferred, but reasonably so, from the openness of the exist- 

 ing neuration, the small space left for branches, and the extreme straightness of the prin- 

 cipal veins, which is another peculiar feature of the species. It is more nearly related to 

 the preceding species than to any other, but is readily distinguished from it by all the 

 features above named, and by the straightness of the costal margin. 



The single specimen was found in a bluish bituminous shale from the culm of the Alten- 

 wald mine, near Saarbrucken, Germany. Middle carboniferous. 



Gerablattina Geinitzi. PI. - 2, fig. 11. 



Blattina Geinitzi Gold., Neues Jahrb. f. Mineral., 1869, 160-61, taf. 3, fig. 5; — lb., Faun. 



saraep. foss., ii, 19. 



Fore wing. The wing is of peculiar form, the costal margin being straight nearly to the 

 tip. while the inner border is rather strongly arcuate and the tip well rounded ; Golden- 

 berg considers the humeral angle as complete, and therefore states, as another point in con- 

 trast to the form of the wing in other ancient cockroaches, that it does not project so far 

 basally as the anal angle ; but this would hardly seem consistent (to the extent figured) 

 with the use of the wing, and we are therefore forced to believe the wing imperfect. The 

 veins originate from the middle of the upper half of the base, and do not curve upward. 

 The mediastinal vein, owing to the straightness and basal contraction of the costal margin, 

 is nearer the margin basally than beyond, pursuing an arcuate course, first divergent from, 

 afterwards convergent with the margin, and terminating only a little before the apex, or at 

 the extremity of the straight portion of the margin ; the area is widest in the middle of 

 the wing, where it is less than a fourth of the entire width of the wing, and is filled with 

 frequent, longitudinally oblique, simple, arcuate veins, about eight in number. The scap- 

 ular vein is remarkable for its excessive simplicity, following close to the mediastinal vein, 

 and forking once only and close to the extremity, beyond the origin of the last mediastinal 

 branch. The externomedian, on the contrary, has a broadly sinuous course through nearly 

 the middle "of the wing, and although it begins to fork before the end of the basal third, it 

 only occupies, with its three branches, the extreme apical border of the wing ; the branches 

 are equidistant, the last emitted before the end of the middle third of the wing, superior 

 longitudinal, and closely crowded apically, the first one (in the only specimen known) 

 simple, the next simply, the last doubly forked. The internomedian vein is subarcuate, or 

 bent in a sense opposite to what is usual in palaeozoic cockroaches, the basal half being 

 nearly straight and bent downward, the apical nearly straight and sublongitudinal, termi- 

 nating just before the tip. where the scapular vein ends, and emitting about eight crowded, 

 subarcuate, simple or forked veins, the apical much more longitudinal than the basal. The 

 anal furrow appears to be lightly impressed, gently arcuate, terminating a little before the 

 middle of the wing; the five anal veins are at first simple and arcuate, like the furrow, 

 afterwards forked and straighter. 



The wing is of small size, measuring 14 mm. in length and 4.75 mm. in breadth; or the 

 breadth to the length nearly as 1 : 3. If the upper surface is exposed, the wing is from 

 the right side. Goldenberg makes no mention of the surface characters. The wing is 



