76 W. W. SWINGLE. 



that we are dealing with abnormal divisions. The same is true, 

 of course, of those cells in which the accessory either divided 

 precociously, half passing to each pole, but one half becoming 

 linked with a smaller chromosome or perhaps a chromatoid body 

 (see Fig. 24), or else the halves of the X are unequal. 



However this may be, it should not be forgotten that the 

 animal in whose germ cells these anomalies of chromosomal 

 distribution occur, is bisexual; i. e., with the germinal products 

 of both sexes in its glands. There may, or may not be, a con- 

 nection between such abnormalities of chromatin distribution 

 at the maturation divisions, resulting, presumably, in the pro- 

 duction of three kinds of spermatozoa, and the fact that in 

 certain strains of this species of frog, males, females and animals 

 possessing marked hermaphroditic tendencies occur. 



It is obvious, however, that the presence of oocytes in my 

 specimen is not due to any inequality in chromatin sharing of the 

 daughter cells at the maturation divisions, because the oocytes 

 are formed long before the male maturation period occurs. 

 Such oocytes may be due to unequal chromosomal division at 

 an earlier period; perhaps in the spermatogonia or even pri- 

 mordial germ cells. In this connection it may be mentioned 

 that in those follicles containing oocytes, and they are far from 

 uncommon in my specimen, spermatids and mature spermatozoa 

 are also usually found. The two kinds of cells may be found side 

 by side. The fact that the germinal products of both sexes are 

 usually found together in the same follicle suggests that perhaps 

 both oocytes and spermatozoa may be products of the same cell 

 originally. It might not be amiss to point out here that the 

 oocytes and spermatozoa found in the same follicles of this 

 animal represent advanced stages in the germ cell cycle, not 

 found in the surrounding follicles. The surrounding follicles 

 contain spermatogonia and prophases of first maturation divi- 

 sions, stages much younger than spermatozoa and egg formation. 



THE SECOND SPERMATOCYTES. 



The second spermatocytes resulting from the first maturation 

 division divide at once without an observable period of rest. 

 The telophase of the first spermatocyte division leaves the chro- 



