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PSYCHE. 273 
oviduct also opens on the opposite side 
a much smaller similar canal, conducting 
to a slight pyriform enlargement (the 
unpaired accessory gland), bearing at 
its tip a delicate thread. Immediately 
after this the oviduct is fed from above, 
and just below the commencement of 
the rectum, by a pair of vermiform, 
widely divaricating, heavy tubes (the 
paired accessory glands), each more than 
a millimetre long, and continuing as a 
tortuous thread, entering the tube at the 
middle of its anterior border. The 
vagina is a stout tube 0.75 mm. in 
diameter, 1.75 mm. long. At the ex- 
tremity of the body, lying against the 
integument and between the opening of 
the vagina and the oviduct, is a-trans- 
verse reniform vessel, attached broadly 
by its base to the inferior wall of the 
oviduct at its very extremity; its left 
tip (and perhaps also its right—but this 
was ruptured in the specimen in which 
the other was seen) terminating in two 
little threads. I do not find notice of 
any such organ in a cursory examination 
of some of the writings of our principal 
entomotomists, unless the following pas- 
sage from Siebold’s Anatomy of the 
invertebrata (Amer. ed., p. 453) refers 
to the same: **Some Lepidoptera have, 
moreover, two smaller ramose glands, 
situated near the orifice of the vagina, 
which secrete, perhaps, an odorous sub- 
stance that excites the copulatory act.” 
A foot note specifies, ‘‘Melitaea, Argyn- 
nis, Zygaena, &c.” 
3. THE LARVA OF POLYGONIA C-ALBUM, OF EUROPE. 
Digestive system. The stomach is 
more muscular than usual, being banded 
with longitudinal and transverse muscles 
made up of approximated fibres much 
larger than ordinary, one pair along the 
dorsal line larger than the others: it is 
9 mm. long, while the intestine and rest 
of the alimentary canal posterior to it 
measures 3 mm., being longer than usual ; 
the whole canal is 16.5 mm. long. The 
salivary glands are long and slender, 
thread-like tubes, at least 3.5 mm. 
long, imperceptibly tapering, and ex- 
tending along the sides of the body in 
a slightly tortuous course to the middle 
of the third thoracic segment, where 
they appear to be closely connected 
with some of the tracheal tubes at the 
base of the latero-dorsal spines. The 
malpighian vessels take their rise from 
a pretty large, irregular, subpyriform 
sac, slightly longer than broad, having 
a very slender neck-like attachment at 
the very base of the intestine ; the lateral 
threads reach the front of the fourth 
abdominal segment; the superior and 
inferior threads nearly as far. 
Nervous system. Each of the lobes 
of the cephalic ganglion appears to be 
globular, 0.4 mm. in diameter, perhaps 
shortest in transverse diameter. The 
lateral nerves arise from the cord in 
front of their respective ganglia by a 
distance greater than the diameter of 
the ganglion, and between the origin of 
the lateral nerves and the ganglia, the 
nervous cord is seen to be double. The 
distances apart of the body-ganglia are 
as follows, measured from centre to 
eentre : 1-2, 1.2 mm.; 2-3, 1.2 mm.; 
