PLATE 26 



EXPLANATION OF FIGURES 



196 Spermatogonium of Jamaicana subguttata Walker, showing one member 

 of the no. 14 pair linked with one member of the no. 16 pair. Thirty-two rod- 

 shaped chromosomes, plus one V-type, plus the sex chromosome, are present. 



197 Prophase of first spermatocyte of same animal showing fifteen tetrads 

 plus the V bi-tetrad plus the sex chromosome. 



198, 199 Lateral views from same animal showing the separation of the short 

 no. 14 and long no. 16 limbs of the V from their no. 14 and no. 16 rod mates. 

 Points of separation marked by the constrictions. 



200 Spermatogonium from Jamaicana unicolor Bnmer, showing two V's of 

 equal size. Thirty rod-shaped chromosomes, plus two V's, plus the sex chromo- 

 some, are present. 



201 Prophase of first spermatocyte from same animal showing the sex chromo- 

 some (18x), the fifteen rod-tetrads, and the large ring-shaped bi-tetrad resulting 

 from the separation of the V's in exconjugation. Note the unequal length of the 

 14, 14 and the 16, 16 sides of the ring. 



202 Spermatogonium of Steiroxys trilineata, after Davis ('08), showing the 

 presence of twenty-six rod-shaped chromosomes plus one sex chromosome. Com- 

 pare with figure 193 in number. 



203, 204 Of Gryllis domesticus, after Baumgartner ('04). 



203 Spermatogonium, showing twenty autosomes plus one V-shaped sex 

 chromosome (x) . Eight of the autosomes are V-shaped with apices turned toward 

 the center of cell plate. 



204 Second spermatocyte, ten autosomes plus the sex chromosome. At least 

 four of the autosomes are V's with apices turned toward the center of the plate. 



330 



