of the lower segments
in the rami of the sixth cirrus.

The thorax, as in the male of _I. Cumingii_, is quite rudimentary, and
serves as a mere flap to protect the mouth. In the three specimens
carefully examined, the posterior cirri had each only one ramus, whilst
the anterior cirri generally had two: in one specimen, one of the rami
in the anterior cirrus was formed of five segments, and the other ramus
of three segments, both rami being supported on a uni-articulated
pedicel; but on the opposite side of the same individual, the anterior
cirrus was represented by a mere knob. The longer ramus of the anterior
cirrus, in the best-developed individual, barely exceeded in length the
mandibles measured along the line of the teeth! In one specimen between
the bases of the posterior cirri, there were two perfectly distinct
caudal appendages; these, like the cirri, are in a quite rudimentary
condition; one was 5/1000ths of an inch in length, and consisted of
three segments, the upper edges of which had short spines; the other was
shorter, uni-articulated, but spinose. In a second specimen, these
appendages were quite aborted. Close under them, on the inside or
towards the mouth, (that is, in the normal position,) there was a
rudimentary but quite distinct penis, with the apex projecting freely,
and with the sides distinguishable from the ventral surface of the
thorax, for the length of 1/1000th of an inch: the corium lining this
little penis made the terminal orifice plainly visible. The vesiculae
seminales lie in the usual position, and are conspicuous; they are
slightly tortuous, with their ends blunt: in the specimen so well
preserved in spirits, they were filled with a mass of spermatozoa,
perfectly distinct; and the whole cavity of the body was lined with
globular and pear-shaped testes. Assuredly there was no vestige of
ovarian tubes. From the greater size and excellent preservation of this
specimen, which rendered the examination of the generative system so
easy, I was able to examine the contents of the stomach, in which I
found the delicate epithelial coat, separated as usual, and containing
cellular matter, on which the animal had preyed, but the nature of which
I was unable to make out. The anus was much plainer than in the male of
_I. Cumingii_. I saw the eye distinctly. I could not distinguish the
orifices of the acoustic (?) sacks; and I think I should have seen them,
if they had existed.

_Prehensile Antenna