294 FERNANDUS PAYNE 



can be an X-chromosome. If he is using the term in some 

 special sense, he fails to define it. 



In his second paper ('14) Voi'nov describes, among the seven 

 primary spermatocyte chromosomes, one which he calls an L- 

 chromosome (fig. 3, E, F). He believes this L-chromosome to 

 be similar to that described by Sinety ('01) in Leptinia,«and 



m-chr, 



1 



m~ch r. 

 m-chr 



ace. 



/ 



m &L i*f 



ace 



Text fig. 3 Gryllotalpa vulgaris. (After Voinov). A, B, C, D, from his first 

 paper, E and F from his second. A, spermatogonial division, 14 chromosomes; 

 B, first spermatocyte division, seven chromosomes; C, the m and X-chromosomes, 

 the X-chromosome dividing unequally; D, same as C, X has not divided; E and 

 F, side views, first spermatocyte division showing XY pair and L-chromosome. 

 In E the accessory is on the same side of the metaphase plate as X, in F it is on 

 the same side as Y. 



also to the hexad group observed by McClung ('05) in Hespero- 

 tettix and Anabrus. It resembles the letter L in shape, and 

 Voinov believes it to be made up of an accessory chromosome 

 and a bivalent. He also figures an unequal XY pair. In one 

 of his two figures he shows the accessory on the same side of the 

 metaphase plate as the X-chromosome; in the other it is on the 

 same side as the Y. He thus believes that the arrangement of 



