MEGANEURID^E. 139 



oft' at least five branches, the fourth being" forked. These branches reach a portion 

 of the outer side, and apex of the wing - , and the whole of the inner side of the 

 apical margin. More inward is seen the distal half of another vein which may be 

 the median. It separates into two branches which reach the distal part of the 

 inner margin. The anal area is hidden by being folded in against the body. 



The wings appear too small and of too rigid a type to have been serviceable 

 for flight, and the elongated abdomen could not have been supported by such 

 rudimentary wings. The size and condition of the hind-wings shows that the 

 great increase in width over that of the teginina in the adult form is a com- 

 paratively late development, and probably synchronised with the shortening up of 

 the abdomen. 



The proximal segments of the abdomen are obscure, but beyond the dislocation 

 can be seen four well-rounded segments, followed by the crushed terminal segment 

 and indications of one of the cerci. 



Affinities. — The generic name attached to these specimens by Dr. Woodward is 

 of doubtful value, since in the present state of our knowledge it is impossible to 

 assign larvae to the adult forms of which they are the immature representatives. 

 The only adult forms known from the same beds are Archimylacris joJousoui, 

 A. eggiutoni and A. incisa. 



Order PROTODONATA (Brongniart), Handlirsch. 



1906. Handlirsch, Die Fossilen Insekteu, p. 30-4. 



Large insects with slender bodies similar to those of the Odonata. Wings 

 large, outspread in the condition of rest, and only capable of an up and down 

 movement in one place. Wing-neuration specialised by the union of several 

 longitudinal veins into accessory or interpolated sectors. Cross-nervures well 

 developed in a regular order. Head large, with large eyes and powerful jaws ; 

 thorax much as in the Odonata. Legs strong and similar. Antennae short. 

 Abdomen long. 



Family Mkiuneurid.k, Handlirsch. 



1906. Handlirsch, Die Fossilen Insekteu, p. 306. 



Wings Protodonate in character, with a pre-costal marginal area destitute of 

 veins. Costa almost straight; subcosta simple, and uniting with the costa far out- 

 Radius simple, and followed by a series of accessory veins which represent the 

 radial sector, these all curving towards the distal inner margin. Median 



