432 J "• KULLAETON, 



mentary. Their "rudinieutary ovaria", whose cells are very similar 

 to those in the incompletely formed ovaries of young and unripe 

 females, are, I believe, really the testes. The misconception doubtless 

 arose from their initial mistake as to the "ovoidal bodies" also tound 

 in mature males. 



Each genital cell in the testis, Figs. 1 — 4 t.c.^ is similar in size 

 and shape, and can thereby serve to distinguish the testes from the 

 mature ovary whose cells vary much in character as will be seen, 

 Figs. 10—12 ov\o. The male cell consists of two portions. Fig. 4 <.c., 

 a peripheral portion, which remains somewhat clearer, and a large 

 central mass, which stains more deeply after treatment with borax 

 carmine. While the cells occupy the greater part of the area of the 

 section, there is apparently a common matrix in which they are 

 embedded and evenly distributed. The whole testis is a single rounded 

 and oblong mass in a more or less close union with the inner wall 

 of the fork, occupying the greater part of the distal end. Fig. 1 t. 



Seminal vesicles in addition to testes are found in the ma- 

 ture males, Figs. 5 — 7 v.s. The number of these vesicles, as well as 

 the number of the testes, depends on the age and therefore the size 

 of the males. The vesicles are altogether absent in immature males. 

 In my specimens I generally found four or five pairs of such struc- 

 tures. Fig. 5, while Cakpentek & Claparî^de have described as many 

 as eight pairs, but no mature male of mine had such a large caudal 

 prolongation as theirs possessed. Greeff , on the other hand , has 

 described T. mariana with a shorter posterior end and possessing 

 three pairs "birnförmige Schläuche", while Ve.jdovsky figures four 

 pairs of "Samenklumpen". The seminal vesicles are present in the 

 segments, where the appendages, instead of being lateral, have become 

 sub-ventral. Fig. 5 par., that is, in the most posterior segments car- 

 rying only indistinctly bi-ramous appendages. Sometimes, however, 

 I have found them present in the last segment with well-developed 

 bi-ramous parapodia, in which testes also are found in the forks. 



They are always ovoidal in shape. Figs. 5 --7 v.s. Some are 

 nearly spherical, while others have the long axis at least three times 

 the length of the shorter. Fig. 6 h. They are true sacs, surrounded 

 by a thin layer of tissue, which, when the sac is greatly distended, 

 is almost invisible except in sections under very high magnification, 

 Fig. 8. But if sections are examined in series, here and there the 

 nuclei of the wall of the sac are distinctly seen, Fig. 8 n. When the 

 sac is not greatly dilated, the investing membrane can usually be 



