specimens here described, of which I examined
six, are exclusively female; they have no trace of the external,
probosciformed penis, or of the two great vesiculae seminales, or of the
testes: on the other hand, the ovarian tubes within the peduncle are
developed in the usual manner, and owing to the large size of the ova,
are of large diameter, and hence very distinct: I detected, also, the
true ovaria at the upper edge of the stomach.

MALE. Plate V, figs. 1-8.

Of the above-described _Ibla Cumingii_ I dissected six specimens, four
from the Philippine Archipelago,[47] and two from the Burmah Empire, and
none of them, as we have just seen, possessed the probosciformed penis,
the vesiculae seminales, or the testes, so conspicuous in other
Cirripedes; on the other hand, all were furnished with the usual
branching ovarian tubes and sometimes with ova, and consequently were
unquestionably of the female sex. Within each of these specimens there
was attached within the sack, in a nearly central line, at the rostral
end, (Pl. IV, fig. 8 _a'_, _h_, magnified five times,) a flattened,
purplish, worm-like little body, projecting about the 1/20th of an inch:
in one of the six individuals, there was a second similar little
creature attached at the carinal end of the sack. Before giving the
reasons which I think conclusively prove that these little animals are
the Males of the ordinary form of the _Ibla Cumingii_, it will be
convenient to describe their structure in detail.

[47] I am deeply indebted to the liberality and kindness of Mr.
Cuming, in allowing me to cut up four specimens of this new
species; and to Dr. Gould, of Boston, U. S., for the examination
of the Burmese specimens.

The whole consists of a long, much flattened peduncle, separated from
the mouth and thorax by an oblique fold, (Pl. V, fig. 1 _h_, _b_), which
is conspicuous on the dorsal margin under the cirri, and can be traced
with difficulty to the ventral margin. The thorax, itself rudimentary,
and supporting rudimentary cirri, is in some individuals, as in the one
represented (fig. 1, _magnified 32 times_), covered by, or received in
the oblique fold _h_, just mentioned: in other individuals the thorax is
drawn out, and then the fold shows merely as a notch on the dorsal
margin, and the basal articulations of the cirri stand some little way
above it. The basal edge of the large, well-developed month can be
traced all round, and on the ventral