512 Mr. R. Shelford's Studies of the Blattidx. 



young and find that below the genital pouch lies a forward 

 prolongation of it with rather thick walls ; this is the 

 brood -sac and as it is not much larger than the genital 

 pouch itself and much smaller than the brood-sac in 

 Panchlora viridis and in Mohjtria mcwulata and Panesthia 

 Javanica, as described below, it is rather difficult to explain 

 its function, unless one supposes that it becomes very much 

 dilated as the fertilized eggs pass into it from the uterus, 

 its walls then becoming membranous and the whole organ 

 pushing forward to lie amongst the abdominal viscera as 

 is the case in other viviparous species. The brood-sac 

 Avas empty in the specimen examined ; the genital pouch 



<5' 

 Dissection of Panesthia javanica, 9 , showing brood-sac, etc. 



3-7 = Nos. of segments. U. = Uterus. 



R. = Rectum. Ov. = Ovary. 



G.P. = Genital pouch. Br. = Brood-sac. 



C.G. = Colleterial gland. N. = Branches of ventral nerve-cord. 



Sp. = Spermatheca. 



had thick muscular walls, and when opened the four finger- 

 like gonapophyses were seen attached to the dorsal wall 

 and directed iDackwards ; in the ventral wall was seen 

 the orifice leading to the brood-sac and lying at the 

 bottom of a depression in the wall of the pouch. The 

 right colleterial gland was well developed, but the left one 

 was aborted. 



In Panesthia javanica, Serv., the egg-mass, which is 

 about 18 mm. long, is contained in a thin- walled brood- 

 sac lying asymmetrically on the left side of the abdomen 



