Wh2] 3hr:r and Kcrshaic — Development of MoufJiparts in Tlomopfera 79 



A 



6. Lateral diagram of egg, about 30 hours; 7, same, about 40 hours; 8, same, 

 about 4 clays; 9, same, about 5 days; 10, same, about 12 days. 



On the second day, before the amniotic cavity has closed, an 

 "indusial thickening" appears on the antero-dorsal_, area of the 

 blastoderm, similar to that described by Wheeler in Xifhidium 

 (Fig. 7, ind.). We have not followed the development of the indu- 

 sia in detail, but two are formed which entirely surround the egg 

 beneath the serosa. The outer indusium (Figs. 8-10, ind. 1) be- 



