106 PROCEEDINGS OP THE ACADEMY OF [1885. 



as close at base as the scapular branches, and as most of them 

 fork and even re-fork, though with entire irregularity, become 

 excessively crowded toward the margin. The length of the 

 fragment is 9 mm., its breadth 5 ram. Probably the wing was 12 

 mm. long, and 5'5 mm. broad. 



It was found in the Corbula or Pecten beds of the Dorset 

 Purbecks of England. 



Pterinoblattina penna, sp. nov. 



The single specimen of this species at hand is preserved in 

 much the same manner as the last, but shows a fragment of the 

 internomedian region. The three principal veins approach each 

 other very gradually so as to give them the appearance of a 

 tapering rod. The mediastinal branches part from the stem at 

 nearly a right-angle near the base of the wing, gradually increasing 

 in obliquity distally, until they form an angle of 45° with it; they 

 are slightly curved, the concavity outward, very closely crowded, 

 and about every third one forked near the middle, but with no 

 regularity. The scapular branches are not preserved, but as in 

 P. pluma, and for the same reason, they probably resemble P. 

 chrysea rather than P. intermixta. The externomedian branches 

 are very closely crowded, generally straight, part from the stem 

 at an angle of 45° next the base, and become almost wholly 

 longitudinal at the apex ; they fork about as frequently as, and 

 more irregularly than, the mediastinal branches. The interno- 

 median area extends far out on the wing, and its branches 

 (what few can be seen) resemble those of the preceding area, and 

 at its extremity are parallel to them. Length of fragment, 13 

 mm.; width, 9 mm. Probable length of wing, 15 mm.; probable 

 width, 9 mm. 



Described from a specimen from the English Purbecks sent me 

 for examination by Rev. P. B. Brodie. 



It is not impossible that the fragment of a larger wing figured 

 by Westwood (Quart. Journ. Geol. Soc. Lond., 1854, pi. 1.7, fig. 7 ), 

 from the Lower Purbecks of Durdlestone Bay may be a species 

 very close to this. 



Pterinoblattina chrysea. 



Mattina chrysea E. Geinitz, Zeitschr. Deutsch. Geol. Gesellsch., 1880, 

 520, pi. 32, fig. 2. 



In this case we have a more perfect wing, the tip being almost 

 completely preserved. The mediastinal vein terminates before 



