414 Sidnej' I. Kornhauser 



would be Seen best in a polar view of the equatorial plate (Fig. 49, 

 Plate VI). In the spermatocytes, the ring (Fig. D 4) generally re- 

 niains in contact only at the broad end, and the other end opens ont 

 gradually to form a rod-shaped tetrad. This is diagrammatically showu 

 in Fig. D 7—9, and ad naturam in Figures 23 d—f, 2bli (Plate V) 

 and Figure 29 (Plate VI). As in Aniphiscejja Uvitatta (Kornhauser 

 '14), the ring in opening out (Fig. 23 e) sometimes shows linin fibers be- 



Textfigures D— H. 





«3 * 



Fig. D. 





1^ 





Fig. E. 



0«^ 





A # *Jk 



i^^^k *U* »B* 



Fig. F. Fig. H. Fig. G. 



Diagrammatic representation, showing the formation of tlie various types of telrads in Hcrsilia. 



tween the diverging ends. Rod-shaped ditetrads (Fig. D 8, 9) are also 

 formed when sister chromosomes separate in the strepsinema along their 

 entire length (Fig. 20, vertical pair), then shorten and spht longitudinally 

 (Fig. 22, Plate V). The "Querkerbe" can never be seen as a hght 

 transverse line until the chromosomes are fully contracted, it being 

 merely indieated by an angular bend in the thread. 



Figure E represents a case similar to that shown in Figure D, except 

 that here the angular bend in the thread is not at the middle. An example 



