242 CLA YVPOLE, [VoL. XIV. 
Among the myriapods, very little trace can be found of any- 
thing resembling nutritive cells; in part they are absent, and in 
part too little histological study has been made of these forms. 
However, Schmidt ('95) describes in Pauropus a peculiar process 
that he interprets as the nutrition of eggs by other eggs. Ova 
have no definite arrangement in the hinder end of the ovary. 
~Some cells of the germinal mass grow in size and gain yolk at 
the expense of the surrounding ova, which cease growing and 
finally degenerate. In Scolopendrella he describes an even 
more astonishing process in which he considers the follicle cells 
to be opposed to the egg cells, and vice versa. Follicle cells 
have the power of migrating into the egg cells. This migration 
is followed by one of two alternatives: either the egg absorbs 
the follicle cells or the follicle cells overpower the egg cell as 
phagocytes, destroying it, and afterwards wander out to become 
the follicle cells of a stronger egg cell. A similar case is men- 
tioned by Weismann in Leptodora, not, however, so phagocytic 
in character. Yolk is formed after this battle is over, and all 
changes in the germinal vesicle are subsequent to this process. 
No mention of any such relation can be found among the 
diplopods or chilognaths. Stuhlmann ('g6) figures eggs of /zlus 
sp. 2 and of Glomeris marginata, in neither of which are there 
any traces of nutritive cells. 
Passing from the arthropods, Wheeler (’96) describes many 
forms of “ Nahrzellen,” or accessory cells, in different groups 
of “worms.” The ovum of Myzostoma is accompanied by 
two accessory cells, which gradually lose their individuality 
as the ovum matures. Ophryotrocha, described by Braem ('93) 
and Korschelt, sheds its ova into the body cavity with one 
accessory cell. The ovum of Tomopteris is accompanied by 
seven smaller cells, while in Diopatra it bears two long strings 
of cells attached laterally, which strings fall off before the 
ovum is mature. Numerous other cases are given, but these 
are enough to show the parallelism of development and re- 
semblance to those found in Anurida. In the latter case the 
ovum accompanied by a certain number of cells is pushed away 
from the germinal mass of cells into the ovary, the cavity of 
which is the homologue in the hexapod of the annelid body 
