238 KATHARINE FOOT AND E. C. STROBELL. 



PLATE III. 

 Euschistus vario/arius and Allolobophora fcetida, 



PHOTO 26. A germinal vesicle with chromosome threads well formed. Nucleolus 

 on periphery. 



PHOTO 27. A germinal vesicle at about the same stage of development as Photo 

 26. The nucleolus near the center. 



PHOTO 28. A germinal vesicle with long, thin, twisted chromosome threads. 

 Nucleolus near the center. 



PHOTO 29. A germinal vesicle showing a later stage of development. The chromo- 

 some threads have contracted into shorter, thicker pieces. Nucleolus still present. 



PHOTO 30. A germinal vesicle with the chromosomes almost at first prophase 

 stage. Nucleolus still persisting. 



PHOTO 31. A germinal vesicle of Allolobophora fcetida. The same technique as 

 that used for the Euschistus germinal vesicles (Photos 18 to 30). The chromosome 

 threads are long, and thin, and longitudinally split. The large, less chromatic 

 nucleolus is on the periphery, and the dense chromatin nucleolus is near the center. 



PHOTO 32. A section (2% /it thick) through the first maturation spindle of Allolo- 

 bophora fci'tida. At the equator one chromosome is shown, the ten remaining chro- 

 mosomes being clearly demonstrated in the adjoining sections. Near the upper pole 

 we see the persisting chromatin nucleolus. A centrosome is shown at each pole 



