BY R. .). TILLYARD 375 



primary branches to the anterior border, excluding the forked 

 distal end; of these, the first four are simple veins, the fifth, 

 sixth, and seventh forked. M sends at least seven branches to 

 the apex and below it. Cu sends also at least seven branches to 

 the posterior border; of these the more anterior ones extend far 

 out below the apex, parallel with the lower branches of M. In 

 the area covered by M and Cu, there are strong indications of a 

 somewhat irregular cross-venation. 



Raised ridges of considerable breadth separate all the veins, 

 except those on the anal area. These ridges appear at first 

 sight to be the veins themselves; but a closer examination shows 

 that they do not join up basally with one another, whereas the 

 finer veins lying between them do all so join up. Thus these 

 latter must be the true veins, the ridges being probably some 

 specialised development of a series of intercalated veins. The 

 cross-venation, where it is well enough preserved to be studied 

 with advantage, can be seen to lie on either side of each true 

 vein, being interrupted more or less by the intercalated ridges. 



Anal area complete, with vena dividens strongly marked. 

 Anal veins weakly indicated anteriorly, more strongly posteriorly. 

 A fairly regular cross- venation present almost all over the anal 

 area. First anal vein both arising from and ending upon the 

 vena dividens; the second lying close below the first, but ending 

 just below the apex; the third and fourth wide apart, the latter 

 much waved; the fifth close under the fourth, much less curved; 

 below this are five more veins, the first two of which are con- 

 siderably waved. 



Type, Specimen No. 155a. (Coll. Queensland Geological 

 Survey). 



Horizon: Upper Triassic, Ipswich, Q. 



Samaroblatta triassica, n.sp. (Text-fig.35). 



A well preserved fragment of a left tegmen, with the greater 

 portion of the base missing, also the apex and a narrow piece 

 along the posterior border. 



Greatest length, 105mm., representing a tegmen whose total 

 length was about 13 mm. Greatest breadth, io mm- 



