216 



Wm. S. Marshall, 



Stuhlmaxn (36; figures (Plate VII, Fig. 113 and 114) two 

 Chambers of the ovary of ÄnaboUa; one of these a young and the 

 other an old one. The structure of the nuclei is not well given, but 

 in the younger oöcyte, >Im Keimbläschen ist ein größerer Nucleolus 

 und einige Granulationen sichtbar, welche wohl als Keste des Kern- 

 gertistes anzusehen sind«. In the oldest oöcyte the nucleus is 

 represented by a small irregulär mass in one corner. The nurse- 

 cell nuclei are all regulär in outline. He called attention to the 

 similarity of these tubules to those of the Lepidoptera. 



Stitz (34) has very little to say about those parts of the ovary 

 with which we are most interested. In the end Chamber of Phry- 

 ganea striata he found two kinds of nuclei; »Die Endkammer jeder 

 Eiröhre zeigt im Innern zwei Arten von Elementen: eiförmige, oft 

 gekrümmte Kerne, welche hell und feingranuliert sind, und kugel- 

 förmige homogen aussehende mit dunklem Nucleolus.« The first of 

 these two kinds, becomes, further down the tubule, spindle-shaped, 

 and they later become the nuclei of the epithelial cells; the second 

 kind become the nuclei of the oöcytes and nurse-cells. In the terminal 

 filament of Molanna augustata there were, near its end, both small 

 and long nuclei, but further down these changed and were shorter 

 and nearly round in outline. 



Observations. 



Ovary A. This ovary was taken from the youngest larva I had, 

 and, while not as early a stage as I wished to commence with, it 

 was impossible, without waiting at least an entire year, to procure 

 any younger ones. A study of the many tubules of which this ovary 

 is composed, shows that there is quite a Variation in the develop- 

 ment reached by the cells in different ones. As in Polistes^ each 

 ovarian tubule showed that the cells in its proximal end or in the 

 middle, were more advanced than those at the distal end. When 

 two tubules, one showing a further development than the other, were 

 compared, it was noticed that the more advanced cells which the 

 older tubule contained, were always present at or near its proximal 

 end. Thus in the youngest tubule of this ovary no nuclei were found 

 in which the spireme-thread was present; in the older ones on the 

 contrary such a stage was found but never in the distal part of the 

 tubule. Some of the youngest tubules showed, in each section, two 

 to six cells in the nuclei of which the spireme-thread was forming; 

 in all such sections these few cells were in the proximal end. 



