INTERNAL ANATOMY OF THE MOTH. 
57 
latorius, and the penis. The testis is shaped like a very thick, nearly 
Spherical, button. (Plate VIII, Fig. 2, and X, Fig. 1, Te.) It is really a 
compound organ composed of two testes fused together. The testes 
can l)o found iu the caterpillar as separate kidney shaped organs lying 
close under the dorsal vessel* iu the fifth abdominal segment. In both 
larva and imago the fifth abdominal spiracle sends a branching tra- 
cheal tree which spreads over and into the testes on each side. The 
vasa deferentia lead from the posterior face of the testes. After a few 
convolutions they dilate into pod-shaped chambers, and then contract 
for a length of very One tubes until reaching the point of union with 
the tjlandulcv mucosr.v, into the basal portion of which the vasa deferen- 
tia seem to open. A short distance farther and the two vasa deferen- 
tia unite into a long, single duct, the ductus ejaculatorius, which is of 
larger diameter, contracting slightly near its end, again dilating into a 
very muscular, gourd-shaped section (Plate X, Fig. 1), which opens into 
the penis. 
The latter organ is a slender, chitinous tube whose top projects be- 
tween the claspers and below the anus, and which lies in the trough 
formed by the ventral arch of the ninth segment, as already described. 
It is protruded by a muscle on either 6ide, the protractor penis, which is 
attached to the ninth segment. The end of one of these protractors is 
shown atpp in Figs. 1 and 2, of Plate X. The retractor was not found. 
From the tip of the penis project two prongs, which bear on their inner 
aspect several stout spines and some smaller teeth, as shown in Fig. 4, 
Plate X. These prongs seem capable of protrusion and retraction, and 
telescoped within the penis can be seen other chitinous processes and 
spines, apparently of considerable complexity, which conld not be sat- 
isfactorily studied in the specimens at disposal. 
FEMALE OEGANS OF ItEPRODUCTION. 
The ovaries consist of four long slender tubes, lying in several folds 
on each side of the body. Their slender tips end in suspensory liga- 
ments, all eight of which unite together immediately under the dorsal 
vessel. At their basal ends the ovarian tubes of each side unite into 
a uterine chamber (Plate IX, Fig. 4, ?/.), the short oviducts from which 
unite into a single oviduct, which passes through the eighth and ninth 
segment and opens between the lateral flaps of the latter beneath the 
anus. 
Two accessory glands — colleterial or sebaceous glands, so called — 
which are concerned with secreting the egg-shell or the cement by which 
the moth fixes the eggs in place when laid, open into the common ovi- 
duct. The anterior gland is single ; the posterior is a pair of glands 
with a single duct. Both consist of long coecal tubes, with pear-shaped 
dilations near the base, followed by another roundish dilation. (See 
*See Meyer. Zeitschr. wiss. Zool. I, 182. Also H. Landois, ibid., xiii, 316. 
