38 



iferous or Devonian formation, diiFerentiation of the veins lias al- 

 I'eady reached nearly or quite the same degree of perfection as in 

 living insects; excepting, 2>ossibly, in some cases where, from the 

 fragmentary nature of the remains, it is impossible really to say what 

 degree of uniformity or simplicity the diiferent veins possessed. 



In the third volume of the Geology of Illinois, I described several 

 species of obscure carboniferous remains of wings under the generic 

 name Euephemerites. They were" so fragmentary that little could be 

 said concerning them, and unfortunately the engravings gave no sort 

 of idea of the structure that could be seen. It is interesting now to 

 find that this wing is so closely related to them that it should be 

 placed in the same genus, though separable specifically from them in 

 the delicate and equal striation of the entire surface parallel to the 

 veins, in the more frequent and apparently more regular branching, 

 and in the considerably smaller size. In none of the former species 

 could the shape of the wing be determined, while this is quiie per- 

 fect. The species may be called Euephemerites j)rimonUalis. The 

 length of the wing is 11.5, its extreme breadth 6.75. It maybe 

 added that a fragment of .an exceedingly slender, straight, perfectly 

 simple, cylindrical and unarmed leg crosses a part of the wing, 

 broken at intervals, but altogether about 7 mm. long. A figure of 

 this species, as well as new figures of the other species of Euephem- 

 erites will be given in a future memoir on the Carboniferous Insects 

 of America, for which I have long been gathering material. 



Upon the same shale is a specimen of Cyclopteris which Professor 

 Lesquereux has determined as C. elegans Lesq., or C Idrsuta Lesq., 

 the specification being doubtfnl, as most of the borders of the leafiet 

 are destroyed. Mr. Lesquereux thinks the shale is undoubtedly from 

 the coal measures of Pennsylvania. 



