fiY R. J. TILLYARb. 



687 



the break in the costa is not very strongly marked, but is evident 

 from the sudden drop in level. Examination in certain lights 

 shows the presence of two distinct veins, both weakly formed, 

 bounding tlie nodal furrow, one on either side. Of these, the 

 proximal is the upturned end of Sc, the distal is the nodal cross- 

 vein (y^c). This latter is prolonged below Sc, for a short dis- 

 tance, before it receives the downwardly-arching end of the sub- 

 costal supplemeiU (Scspl), or vein which appears to form a pro- 

 longation of 8c beyond the nodus. That there is a distinct gap 



Text-fig. 10. 



.Eiichnkliop.ns Jiindersienais (Woodward), hindwing; region of nodus and 



radial sector; ( x 12^). 



between 8c proper, proximal to the nodus, and Scspl distal from 

 it, can be clearly seen, so that the second branch of Sc spoken 

 of, on p. 680, as apparently running straight through the nodus, 

 does not really exist at all. It can also be seen, that the sup- 

 posed third l)ranch mentioned on the same page is non-existent, 

 being none other than the downward production of the nodal 

 cross-vein itself, which curves round, posteriad and distad, to 

 meet R at the stibnodns (Sn). At this point the vein, which is 

 clearly the true Radial Sector (Rs) comes off posteriad from R, 



