S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 109 



branches, the second only apically forked in the specimen, and, so far as preserved, the only 

 forked vein in the wing ; the anal furrow is slight, rather gently arcuate, apically straight, 

 terminating at the end of the basal third of the wing. 



The wing is a very large one, the fragment measuring 40 mm. in length, and 15 mm. in 

 breadth ; the whole wing is probably 47 mm. long, so that the breadth is to the length as 

 1 : 3.1. Goldenberg estimates the length at 45 mm. The base is broken obliquely, so that 

 the anal veins are absent, and a considerable portion of the apex is wanting, particularly 

 next the inner margin. If the upper surface is exposed, the wing is of the left side ; the 

 veins are very prominent, and the interspaces are filled with a close, irregular net work of 

 delicate cross veins, particularly distinct in the interspaces on either side of the first inter- 

 nomedian branch. 



This species is peculiar, both for the sparseness of the neuration, and for its extreme 

 simplicity, only one of the many branches preserved being forked ; it is also much more 

 elongated than most of the species, and lias an excessively long mediastinal area, reaching 

 nearly to the tip of the wing, and, notwithstanding the slenderness of the scapular area, 

 throwing the externomedian branches wholly upon the inner side of the apex. In the 

 slenderness of the wing the preceding very much smaller species approaches it, and in sim- 

 plicity Gerabl. weissiana seems nearly allied, but it is readily distinguishable from both by 

 the extreme length of the mediastinal area. 



The single specimen was obtained in the " upper division of the Thuringen carboniferous 

 series," at Manebach, in the neighborhood of Ilmenau. Upper carboniferous. 



G-erablattina weissiana. PL 3, fig. 1. 



Blattina euglyptica var. weissiana Gold., Neues Jahrb. f. Mineral., 1869, 163, taf. 3, fig. 10; 



— lb., Faun, saraep. foss., ii, 19. 

 Blattina weissiana Gold., Faun, saraep. foss., ii, 26, 51. 



Fore wing. Only a part of the upper half of the wing being preserved, its form cannot 

 be stated, but the costal margin is strongly and regularly arcuate, and the tip apparently 

 well rounded ; the veins are arcuate at the base. The mediastinal vein runs entirely parallel 

 to and not very distant from the margin until beyond the middle of the wing, when it grad- 

 ually approaches it, and terminates in the middle of the outer half of the wing; it emits 

 nine or more straight, parallel, rather longitudinally oblique, simple branches. The scap- 

 ular vein also runs parallel to the costal margin, and terminates just before the extreme 

 tip; it begins to divide at a little distance beyond the middle of the wing, and in quick 

 succession emits three nearly longitudinal branches, whose course cannot be traced far 

 beyond their origin. The externomedian vein diverges slightly from the preceding in the 

 basal half of the wing, running in a nearly longitudinal course about as far from the me- 

 diastinal vein as the latter is from the margin ; it probably terminates not much further 

 below the tip than the scapular above it, 1 and only the extreme apex is therefore occupied 

 by this vein and its two branches; these branches are longitudinal, anil arise near together, 

 one at, the other a little beyond, the middle of the wing, and seem to crowd this part 

 of the wing with veins more closely than elsewhere. The internomedian is represented by 



1 Wrongly represented on our plate by the outside mark, as if the internomedian vein belonged to this area. 



