No. 2.] ANURIDA MARITIMA. 223 
This fact is true of Blatta also, as shown by different author- 
ities. The cephalic ends are united, but there is no “Endfaden”’; 
it is quite possibly present, however. Fig. II is a copy of the 
same author’s representation of the ovary of Forji- 
cula auriculartia. Here, as Lubbock ('59) says, the 
ovaries consist of numerous very short tubes, three 
rows in each ovary. These open into a large tube 
which passes back into an enlarged chamber. The 
cephalic end shows a curious elongation that clearly 
unites with one of a similar nature 
from the other ovary (Fig. III); 
how these finally end is not figured 
nor described. 
Passing now to the Thysanura, 
an interesting and suggestive series ee 
can be arranged. According to 
Grassi ('88), each of the ovaries of 
Machilis consists of seven short egg 
tubes. These open into two straight 
tubes running the length of the body 
(Fig. IV) ; according to Oudemans (’87), 
each of these tubes is continued into a separate 
oviduct, and both of these lead into a common 
opening without union. There is in this stage 
nothing metameric about the arrangement of the 
tubules. The germinal epithelium is at the ends 
of the tubes, but there is no evidence of the “ End- 
faden”’ as developed in higher forms of the insect 
ovary ; Oudemans (87) distinctly recognizes its 
absence. The conditions found in Japyx are some- 
what similar; here there are egg tubes shorter 
than in Machilis, and arranged metamerically in 
the first seven abdominal segments (Fig. V); the 
«‘Endfaden’”’ is also absent. Campodea, shown 
in Fig. VI after Grassi (88), has a distinctly dif- Fic. IV. 
ferent structure from the two preceding Thysanura. Each of 
the two ovaries has the appearance of consisting of a single 
ovariole. This is, however, much longer than in the typical 
Fie. III. 
Fie. II. 
