436 



Sidney I. Kornhauser 



sections, matiire spermatozoa with long filamentous tails. The remainder 

 and greater part of the sex gland is composed of typical oöcytes (compare 

 with Fig. 3, Plate IV), which had ah-eady grown to a considerable size. 

 Females just previous to the fmal moult and already much larger than 

 the ordinary males show oöcytes which are not nearly so large as those 

 of this small hermaphrodite. 



Textfigure I. 



Soma (S 



ESp 'cy/-es 

 Mefaphase 



Soma j 



At the left, normal speimatoiyte divisions. Above, case ), in wliich y-chromosome is cut througli. 

 Below, case 2, in which x— (;hromosonie is cut through. Black = autosomes; circle with cross =: 



x-chromosome; piain circle = y-chromosome; a,h,-\ = types of spermatozoa; ISy'cytes = primary 



spermatocytes; IlSp'cytcs = secondary spermatoeytes; Sp'zoa = spermatozoa. 



It at once occurred to the author: Could such a hermaphroditic indi- 

 vidual be the result of abnormalities in the spermatocyte divisions, such 

 as described on page 419, and shown in Figure 38 (Plate VI)? If, in 

 the first maturation mitosis, one of the lagging hetero-chroniosomes, 

 assuming that they are sex chromosomes, should be cut into two parts 

 by the division of the cytoplasm, would there be any irregularities in 



