No. 2.] ANURIDA MARITIMA. 235 
reproductive organs from any pterygote or even apterygote 
insect thus far studied. Passing down the line of tracheates 
the nearest related forms are among the myriapods, and here 
are found possible explanations for some of the peculiarities 
noted. 
The myriapods, as a group, present so many distinct types 
in the structure of the reproductive organs that the validity of 
the group has been reasonably called into 
question. Without going into any discus- 
sion of the matter, a few points of com- 
parison may be taken from among the 
different groups. According to Vogt and 
Yung (90), the ovaries of the Chilopoda, 
taking Lithobius as a type, are large, un- 
paired, flattened, irregular masses of eggs 
opening by an oviduct at the hinder end 
of the body. They lie in the posterior part 
of the body over the alimentary canal and 
below the heart, while the single unpaired 
opening is ventral. The eggs develop irreg- 
ularly in the ovary, which is rounded and 
widest at its cephalic end with no trace of 
an ‘ Endfaden.”’ Sections made of a just- 
born specimen of Scolopendra complanata 
show a median unpaired ovary lying over 
the alimentary canal and attached to it, 
appearing as if the cells giving rise to the 
ovary originated in the outer wall of the 
intestine. Fig. VIII is taken reduced from Fabre ('55), whose 
work on myriapod structure is still considered authoritative 
with the additional value of recent confirmation by Vom Rath 
(90). This figure shows the ovarian sac of Glomeris marginata, 
a chilognath. The first impression is that this ovary is also un- 
paired, but, as is common with this group, this is a derived con- 
dition; the two ovaries were primitively distinct, but a fusion of 
their walls took place on the median line, forming a single sac. 
The ovarian sac lies below the alimentary canal, between it 
and the nervous system; the openings are paired and anterior, 
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Fic. VIII. 
