No. 2.] ANURIDA MARITIMA. 239 
that arises on the increase in number and length of tubes found, 
for example, in Blatta. In origin the cells of the “ Endfaden”’ 
arise from the same source as those of the ovary, and it can be 
considered as simply elongations of certain parts. On this basis 
it is difficult to see why two forms, preserving as simple an 
ovarian structure as that found in Anurida and Forficula, both 
show an anterior elongation. A possible interpretation will 
lie along another line. The elongation in Forficula is totally 
distinct from the germinal epithelium, which lies at the free 
ends of the short tubes. The two parts unite on the middle 
line (Fig. III). In Anurida the elongations are also distinct, 
and from their union with the fat body in the thoracic seg- 
ments evidently serve the purpose of suspensory attachments. 
Cross-sections of these chords near the ovary show in some 
cases a distinct lumen in the middle of them. In some 
cases this persists for some distance, giving the thread the 
structure of a fine tube. In the embryo this part of the ovary 
is very striking and bends over distinctly towards the ventral 
wall of the first abdominal segment (Fig. 58). It appears 
long before any duct at the hinder end has begun to develop. 
Its position, structure, and relations in the adult ovary and its 
early development and peculiar relations in the embryo all 
strongly suggest a possible connection with the oviducts of the 
chilognath or symphylid. Change of function would now 
account for its relations to the second thoracic segment of the 
adult, but its embryonic relations suggest that it once was con- 
nected with the first abdominal segment, which bears the 
collophore. A suggestion might be made in regard to this 
problematic organ, which has been considered in so many 
different aspects. Wheeler (90), following Graber ('s9) and 
Carriére, gives these views at length, and it is only necessary 
to say that whichever of the three functions it serves, — of gills, 
sense organs, or glands, —it is undoubtedly a pair of fused 
appendages. In the Symphyla, which, according to Haase (’g6), 
are nearly related to the hexapod ancestor, the genital opening 
lies in the median line between the fourth pair of legs (Haase, 
'g9, Fig. 1). A study of the genital openings of Polydesmus, 
Craspedosoma, and other chilognaths, as given by Fabre ('55), 
