7C, FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



188-3) somewhat vaguely placed it, " with a strong degree of probability, in the 

 same general group as some other I'ahwo/oic wings." This reference can only be 

 to the Palseodictyoptera. Later he published a restoration of the wing, and classed 

 it with the Protophasmidge. Brongniart atone time regarded it as a Dictyoneuron, 

 and later as a " Neurorthopteron " of the group Slhenaropterida. Still later 

 he placed it as a Nenropteron in the group Platypteridse. Handlirsch considers 

 that the costa is marginal, and that this character, with the sharp inward curve 

 of the anal veins, justifies its inclusion in the Palseodictyoptera, although lie does 

 not attempt to indicate its allies. 



A second species was described by Brongniart as A. ln<-nxi (' Bull. Soc. Amis 

 Sci. Xat. Rouen' [o], ami. xxi, p. <><), 1885), but this throws no light on the 

 genus, nor does it appear to be generically referable to Archseoptilus. 



The only details preserved which can be used in the determination of relation- 

 ship are the spiny outer margin, the great width of the principal veins, the 

 well-developed cross-nervures, and the strongly curved and numerous anal veins. 

 Even these are too fragmentary for safe conclusions to be drawn in the absence 

 of other material. 



The general structure of the wing-fragment is to me more suggestive of the 

 Protodonata than of the Palseodictyoptera, but the presence of well-marked anal 

 veins discounts this view, unless we are prepared to accept the specimen as an 

 early and archaic prototype of the Protodonata. 



Order M I XOTKRMITOIDKA, Handlirsch. 



I'.MM;. Handlirsch, Proc. U.S. National Musc'Uiu. vol. xxix. p. <;!>.">. ami Die Fossil Inseklt'ii. \>. l^i',. 

 1919. Handlirsch, Ut-vision <ler Paliiozoisclieu Iiisekten, \>. -i>. 



Subcosta much shortened; radial sector arising close to the base, \\itli - :> 

 branches, of which only one forks. Median long, four-branched and suggestive of 

 the Palseodictyoptera. Cubitus with "2 :.! inward branches. Anal vein :>, simple. 

 Cross-nervures strong, wide-spread and regular. 



This is a provisional order established by Handlirsch to include two forms 

 only Mixoter tries luganensis, Ster/el, from the Coal Measures of Saxony, and 

 Geroneura //>-<>///, Matthew, from the Carboniferous of St. John, New Bruns\\ ick. 

 North America. l>oth wings show clearlv their Palseodictyopteroid ancesli-y, but 

 I landlirsch is uncertain whether thev should be brought near to the Protorthoptera 

 or to the I'ri'liihe. 



(ienus GERONEURA, Matthew. 

 ls!-i;. lirfiiiii-iifii, Miiiihcw. '1'rans. li'ov. Sm- Canada, vul. \i. scrt. i\', \>. .".7. 



fJeneric Characters. \Vingtlirec times aslongas wide; apex obluselv rounded; 



