342 FERNANDUS PAYNE 



So striking is the resemblance to the condition described in the 

 growth period of the spermatocytes of Pironidus (Payne, '09) 

 where beyond a doubt, the idiochromosomes are imbedded in a 

 plasmosome, that this conckision seems very probable. At the 

 time of synapsis or shortly after (fig. 7 F), the nucleolus is much 

 reduced in size and later it completely disappears (fig. 8 B, C, D, 

 E and F, serial sections of a single young oocyte). Foot and 

 Strobell believe, on account of size relations, that the nucleolus 

 in Protenor represents something more than the two large idio- 

 chromosomes. Is it not possible that here also, the nucleolus 

 is one in which the chromosomes are imbedded and that it dis- 

 appears at the time of cell division, leavong only the chromosomes? 

 The main difference then between the nucleolus in the ovaries of 

 Protenor and Gelastocoris is the period during which it persists. 



In this same paper Foot and Strobell describe the terminal 

 chambers of the ovaries of Protenor as differentiated into three 

 distinct zones. They designate these zones as yl, 5 and C, A 

 being the apex of the terminal chamber. B is the middle zone and 

 is characterized by large nuclei which vary in form and structure 

 and which stain intensely with chromatin stains. Zones A and C 

 are somewhat alike, the nuclei being smaller than in zone B and 

 staining less intensely. These same three zones have been 

 described by other workers (Will, '85 ; Korschelt, '86, and Preusse, 

 '95). So far all these workers agree. They further agree that 

 the larger nuclei of zone B arise by a process of growth from the 

 nuclei of zone A . The difference of opinion arises as to the inter- 

 pretation of the nuclei of zone B and the origin of the nuclei of 

 zone C and hence the origin of the ova. Korschelt holds that the 

 nuclei of zone B are purely nourishing nuclei which disintegrate 

 to form food for the developing ova, and that the nuclei of zone 

 C arise by a continuation of the nuclei unchanged from zone A. 

 On the other hand Foot and Strobell ('11) with Will ('85) claim 

 that the nuclei of zone B are not all nourishing nuclei and that 

 the nuclei of zone C arise in the main by fragmentation or amitotic 

 division from the large nuclei of zone B. 



While the end chambers in the ovary of Oelastocoris are not 

 divided into three distinct zones, the material is very favorable 



