302 Chromosomes in the Spermatogenesis of Anasa Tristis 
giving this chromosome the dyad form which is typical of the other 
chromosomes at this stage. 
Sixth, the interpretation that this secondary furrow foreshadows a 
second division is confirmed by the demonstration of the actual division 
of the eccentric chromosome—this proving that the delay in the division 
of this chromosome does not necessarily mean the omission of its 
division. 
Seventh, we have demonstrated that a delay in the division of the 
eccentric chromosome may occur also in the first spindle and we have 
shown that in certain phases characteristic of the behavior of the lag- 
Gana: Fic. 4. 
Text Fic. 3. Reproduction of one of Paulmier’s sketches of the second 
spindle of Anasa tristis, go. 
Text Fic. 4. Diagrammatic reproduction of Photo. 47, Plate III. Enlarged 
one diameter. 
ging chromosome in the second spindle we have a striking repetition of 
what may occur in the first spindle and we have given reason for believ- 
ing that the typical eccentric position of this chromosome in the early 
stages as well as the difference in its plane of division may be in a 
measure responsible for its frequent retarded division in both the first and 
second spindles. 
The Spermatogonial Chromosomes.—lf we are right in our belief 
that the eccentric chromosome of the first spermatocyte has the same 
value as the other chromosomes—that it is a bivalent and not a uni- 
valent as interpreted by Wilson and Montgomery—that it represents 
