546 PROCEEDINGS: BOSTON society natural history. 
contained mature and active spermatozoa. In these cases the sper- 
maries contain but a small number of sperm mother cells, sperma¬ 
tocytes, and spermatozoa, and are not more than one third or one 
fourth as large as the diameter of one of the embryos in the body 
(pi. 23, fig. 6), and yet they are actively engaged in the formation 
of spermatozoa. 
Finally, we meet with worms of much smaller size than either the 
females or the hermaphrodites with embryos and these are filled to 
the point of rupture with distended spermaries. These smaller indi¬ 
viduals must therefore be looked upon as representing the purely 
male condition. In these forms no trace of eggs or embryos can be 
observed. 
The small males are much less numerous than individuals with 
eggs or embryos, and in this respect the species agrees with G. 
australiensis. Indeed, in several species of the genus, as in G. 
chalicophora (according to Bohmig, ’98), G. graffi , and G. novae- 
zealandiae , the males are as yet unknown, individuals supposed to 
be females being the only known representatives of the species. 
The reproductive organs are further complicated by the presence 
of undifferentiated sexual glands, which occur in some individuals 
in addition to the gonads which form ova only or spermatozoa only. 
These undifferentiated glands form both kinds of reproductive ele¬ 
ments in a manner similar to that which has been described by 
Montgomery (’95) for Stichostemma. As shown in figure 7 (pi. 23) 
such indifferent gonads apparently form and discharge their sperma¬ 
tozoa first and develop their ova afterward. These gonads are 
therefore protandric, and it is very likely that individual worms 
occur in which this is the case with all the gonads of the body. 
After the discharge of the spermatozoa the ova in the same gonads 
complete their development and the individual might then be looked 
upon as purely female. This is likewise the case in Stichostemma 
eilhardi , as described by Montgomery (’95). 
Ovogenesis .—In the development of the ovaries the young sexual 
gland is composed of a considerable number of cells, all of which 
seem to be of the same size and appearance. At a somewhat later 
stage three or four of these cells are decidedly larger than the others, 
and of these larger cells either one or two considerably surpass the 
others in size. Finally a single cell becomes distinguished from the 
others by its larger size and content of yolk spheres, and this becomes 
