552 
nation appear in some species 
to perform likewise the office 
of reserveirs for the seminal 
fluid. In a large African species 
Mr. Newport found the double 
bine intromission to be 
ensile (fig. 314, B, a), 
each part ls the form of a 
distinct claw between the move- 
able joints, of which passes out 
the elongated half corneous 
penis. These are co- 
vered in anteriorly by a horny 
valve somewhat of a trian- 
gular form, and the whole oc- 
cupies an oval space on the 
under surface of the seventh 
segment, corresponding to that 
usually occupied by the legs. 
“ With regard to the product of 
secretion in these organs,” ob- 
serves Mr. Newport,* “ I have 
never yet found any thing but 
a granulous fluid in the ceca, 
eeperonty similar to the gra- 
nules in the higher animals 
from which Spermatozoa are 
produced, but this might have 
arisen from the immature re- 
cent specimens I was alone 
able to obtain. It would be 
interesting to ascertain whether 
these germs of Spermatozoa are 
produced in the ceca as there 
seems reason to believe, as we 
shall presently find that the ova 
in the female are secreted in 
sacs which appear to be ana- 
logous to these ceca in the 
male organs. I am inclined to 
think that the Spermatozoa are 
not iste x he until the granu- 
lous fluid has passed into the 
efferential ducts at the season of 
impregnation.” 
e female organs of the 
Julide (fig. 315) are described 
with equal minuteness in the 
paper above referred to, from 
which we extract the following 
exceedingly valuable observa- 
tions, as nearly as possible in 
the words of Mr. Newport him- 
self, to whom we are also in- 
debted for the illustrative fi- 
gures. In the female Julus, the 
organs of reproduction are as 
simple as those of the male. 
They consist of a single elon- 
gated bag or oviduct, covered 
on its exterior surface with a 
very great number of ovisacs 
or coeca of various sizes, each 
of which secretes but a single 
ovum. This oviduct extends . 
backwards beneath the alimentary canal, from its 
Fig. 315. 
* Phil. Trans, for 1841. 
MYRIAPODA. | 
appearance that they present towards their termi- double vaginal outlet (a a), which is 
Aa 
in the fourth segment behind the second pait 
of legs, as far as the posterior part of | 
rectum close to the anus, where it ends in a — 
cul-de-sac (d). It is most nearly in contact with 
the alimentary canal on its upper surface, but 
is separated from it by adipose tissue; 
the pregnant female it is smooth, and 
tended with ova that have passed into it 
from the ovisacs, and are ready to be 
posited immediately after intercourse with 
male. The ova at the anal extremity, | 
is, at the commencement, of the duct 
as perfect as those near the vaginal outle 
The oviduct contains within its cavity, at le 
from seventy to eighty of these perfect ees 
awaiting ienpeegiianes, Sean in two or mot 
irregular rows, and greatly distending its sides 
In some of the larger species of the ge 
there are four and in others five rows of eggs, 
number of which is much greater than in our | 
tive species. The ovisacs (fig.315 and 316,¢ 
% 
are little sacculi, distributed thickly to the n 
ber of many hundreds over the whole 
of the oviduct, from its posterior or eax 
tremity to within a short distance of its vag 
outlets. Each ovisac, whatever be its 
developement, contains but a single ©) 
every part of which is produced in it, for 
germinal vesicle in the most rudimentary 
to the yelk, albuminous fluid, and shell. — 
fact deserves particular consideration. A 
proportion of the ova in the ovisaes ” 
arrive at maturity, but are re n 
growth by the more rapid developeme 
others that are near them, so that on exalt 
an oviduct partially distended with 
greater number of ovisacs in different 
developement, are at the sides and oP 
under-surface of the duct, in parts which ¢ 
nd to the interstices between the fully. 
oped eggs, that have passed into the ovi¢ 
or are still forming on its exterior. One re 
ovisacs usually exists on each side of the: 
near its upper part, but most of the ovisaes } 
the course of developement are at IS 5 
ioe 
4 
