340 FERNANDUS PAYNE 



seventy-seven with the normal number (eleven) and seven with 

 twelve. If this be a real chromosomal variation why should the 

 variations always be greater than the normal number and never 

 less? 



I have included two figures of Gelastocoris (fig. 6, A and B) 

 where a large number of undoubted yolk granules are present. 

 ^ is a prophase of the first maturation division before the nuclear 

 wall breaks down and B a metaphase plate showing how difficult it 

 is, looking at a single cell, to differentiate between granules and 

 chromosomes. 



Fig. 6 Gelastocoris oculatus Fabr. .4, prophase of the first spermatocyte divi- 

 sion showing many yolk granules outside the nucleus and their close resemblance 

 to chromosomes ; B, metaphase plate, first spermatocyte division showing the chro- 

 mosomes in the middle and the granules near the periphery' of the cell and also 

 the close similarity between the two. X 860. 



II. THE NUCLEOLUS IN THE YOUNG OOCYTES AND ORIGIN OF THE 



OVA IN GELASTOCORIS 



In a recent paper ('11) Foot and Strobell describe a chromosojne 

 nucleolus in the oogonial cells of Protenor and also describe the 

 origin of the two large idiochromosomes from it at the time of 

 mitotic cell division. At the time this paper appeared, I was 

 working on the nucleolus in the ovaries of Gelastocoris oculatus. 

 While the two forms have some things in common there are several 

 points of divergence. As stated, the nucleolus in Protenor is 

 confined to the oogonial cells. This is not the case in Gelastocoris. 

 Here it appears after the last oogonial division, in the early oocyte, 

 and persists until shortly after synapsis. Figure 7, A is an oogonial 

 cell in which there is no indication of a nucleolus. Figure 7, B shows 

 an early oocyte and the beginning of the formation of the nucleo- 



