1968] 
Carpenter and Richardson — Megasecoptera 
303 
nearer the base than M ; CuA has a marginal fork in one wing but 
is unbranched in the others; CuP is long, extending about to mid- 
wing. The degree of development of the anal areas seems to be some- 
what different in the four wings but this may be the result of slight 
distortion of the wing bud ; in all wings there seem to be a prominent 
anal vein and a very short submarginal vein nearer the base. Cross 
veins can be discerned only faintly and with uncertainty over most 
of the wing, but in the posterior parts of the wing and along the 
hind margin, they are more distinct; two or more distinct rows of 
cross veins are present posteriorly. 
Body Structure : head. This is small in comparison to the rest 
of the body but has conspicuously bulging eyes. The antennae, which 
are covered with short hair, are preserved in a nearly symmetrical 
arrangement; the three basal segments are unusually stout, as in the 
nymph of Lameereites , with the remaining segments (10 or more) 
much smaller. The head as preserved seems to have been hypo- 
gnathous, there being no sign of the beak anterior to the procephalon. 
However, examination of the head under high power shows a some- 
what circular area situated between the antennae; its structure and 
position suggest that it is a cross section of the beak, which apparently 
extends into the matrix at right angles to the longitudinal axis of 
the body. The presence of the beak in the specimen of Lameereites , 
in any event, is sufficient to demonstrate the existence of a beak 
in the nymph of Mischoptera. thorax. The prothorax is remark- 
ably similar to that found in the adult of Mischoptera , there being 
four lateral spines extending for a considerable distance on each side. 
The meso- and metathoracic structures are more difficult to interpret. 
Two prominent spines project from each of the segments, near the 
bases of the wings, the spines projecting slightly beyond the wing 
margins and giving the impression that the spines arise from the wings. 
Less well preserved is another spine from each of these thoracic seg- 
ments, just posterior to the bases of the wings; only the proximal 
parts of these spines are preserved, but judging from the width of 
these bases, we infer that the complete spines were longer than the 
more anterior pair. There is some indication in the fossil that other 
spines of comparable structure occur along the dorso-lateral portions 
of the two thoracic segments above the wing bases and vague indica- 
tions of another row along the pterothorax below the level of the 
wings; however, the crushed condition of the body prevents identifica- 
tion of these particular spines. The same preservation prevents satis- 
factory interpretation of the complicated pattern of thoracic structures 
actually visible in the fossil. The mesothorax seems somewhat the 
