The cellular eleinents of the Ovary of Platyphylax designatus Walk. 225 



companying group of nurse-cells. These cells have increased very 

 mucli in size; the epithelial cells have increased in number, and 

 arranged themselves around the oöcyte and, indistinctly, around each 

 group of nurse-cells. They also separate the Chambers from each 

 other, and a few may lie between an oöcyte and the nearest nurse- 

 cells belonging to it. 



Diötally there is as usual a terminal filament; this is foUowed by 

 a long, narrow end Chamber which, by a slight indentation, is nearly 

 divided into two parts. In this end Chamber (Fig. 38) are found a 

 few developing cells and a number of bodies we hold to be dead 

 ones. These latter are of different shapes; each lies in a clear space 

 and eonsists of a rather homogenous mass in which is a large, darkly 

 staining body that, in most of them, has a distinct outline; in some 

 however this is not so and the stained part goes over very gradually 

 into the unstained mass. A few of these bodies are large and dif- 

 ferent consisting of a rough unstained mass in which no structure 

 can be made out. The regulär cells which are here present, show 

 different stages in development from the undifferentiated cells, a, to 

 those with large chromatin granules, and one, c, in which the 

 Strands are being formed. Near the proximal end of the tubule are 

 two cells, in the nuclei of which the spireme-thread is already 

 formed. 



In the five Chambers (Fig. 37) we notice, as we pass from the 

 youngest to the oldest, that the proportion of each Chamber occupied 

 by the oöc^^te increases, and that filled by the nurse-cells, decreases. 

 The first, most distal, Chamber shows five nurse-cells, the nucleus 

 of each contains one or two rather large nucleoli and a great many 

 small granules; these latter are connected by delicate achromatin 

 fibrils. The nucleus of the oöcyte contains a few of the paired 

 chromosomes we have already noticed. Epithelial cells lie around 

 the oöcyte and a few are seen at the margin of that part of the 

 Chamber in which the nurse-cells lie. In this youngest Chamber the 

 cytoplasm of all the cells stains equally, but, in the older ones, the 

 nurse-cells are darker than is the oöcyte, 



The oöcyte of the second Chamber may have either a round or 

 a pyriform nucleus, the latter shape, when present, being due to a 

 thick process which extends up between the nearest nurse-cells. In 

 the three other Chambers, the oöcyte becomes much flattened and is 

 more rectangular in outline. In each of the four last oöcytes the 

 nucleus contains a large nucleolus in which there are a number of 



