34 



of the ovariar v.-all are s::iall and soinev/hat flattened. Their 

 nuclei are about the same size as the nuclei of the nriiitive 

 ger- cells, but are less dense. The nucleoli rre con- 

 spicuous and stain d.eply. In genera' the cells of the er)i- 

 thflium of the ovary are sin^ilar, excent they are not as 

 much flattened,) to the cells in other narts of they^ctoderral 

 layer of the subu^brella. The eggs in the ovary lie next 

 to the rr.esogloea, that is, there is no ectoder-.ai tissue 

 betv;een theT and the supr)orting layer. The ovarian eggs are 

 irregular in shar^e due to their being crowded together; but 

 v;hen liberated£hey becoire spherical. 



DEHISCEi\CE. 



The eggs are imbedded in the ectoderr-al layer of the 

 manubriuT:, As the ova grov; and increase ir size the epithel- 

 iuiT' of the ovary becomes -ore and more distended, when they 

 have reached aturity the outer ectodermal tissue of the ovary 

 is under r-onsiderable tension. Finally v/hen the time for de- 

 hiscence arrives, the outer wall of the ovary is runtured 

 by the aid of the ruscular contractions of the manubrium 



