Mineralogy and Geology. 271 
rowly near the base, the upper fork again forking in a similar manner, 
and the lower emitting branches from its under side; the sixth is proba- 
bly nearly as in the Palzopterina, though but little remains of it. The 
wings overlap one another very completely, are twice as broad in the 
middle as at the base, strong, the nervures prominent, and connected 
throughout by frequent and strong, generally straight, cross-veins. The 
egs are broad and compressed. 
ily Ephemerina ; while the most interesting of all isa wing which appears 
Be to blend the peculiar structure of the stridulating apparatus of the male 
a in some Orthoptera, with the general mode of neuration of the wings 
holding in the Neuroptera, carrying the synthesis one step farther back. 
4 Boston Society of Natural History, Jan. 30, 1866. 
a 6, Paleontology of the Upper Missouri. A Report upon eg pod 
jeut. G. A. 
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and affinities of the species, their synonymy, and their stratigraphical and 
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