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Gen. 2. CryptOthlr, Dana, 1852.
Syn. : Cryptothiria, Sp. Bate (part).
Hemioniscus, Bucliholz.
Generic Characters. Body of adult female forming a broad, lobular sac,
apparently without any distinct segmentation, but exhibiting in front, somewhat
dorsally, a small conical projection, constituting the anterior larval part
of the
body still retaining its appendages, and serving for the attachment of the parasite.
Young female Praniza-like : with the middle segments strongly tumefied. Male (and
last larval stage of female) slender, with distinct, though small eyes, basal expan-
sion of antennulse spatulate, and coarsely dentate behind. Parasitic in the mantle-
cavity
of barnacles.
Remarks. This genus was established by Dana in the year 1852,
to in-
clude a small parasite, C. minutum, found off the Fiji Islands in the corallido-
mous barnacle Creusia. In 1860, Sp. Bate recorded, under the name of Liriope
balani, another form, which is undoubtedly congeneric with Dana's species, and
which also in the History of British sessile-eyed Crustacea was referred to that
genus (here spelt Cryptothiria); in the same genus was, moreover, included
a rather different form, viz., the Liriope pygmcea of Rathke,
which constitutes the
type of a distinct and rather anomalous genus. The species of Sp. Bate was
subsequently, in the year 1866. rather fully described by
Dr. Buchholz as the
type of a new genus, Hemioniscus, which name, however, must cede to that pro-
posed by Dana. To the Norwegian fauna there belongs only a single species,
to be described below.
Cryptothir balani, Sp. Bate.
(PI. XCVIII, fig. 2).
Liriope balani, Sp. Bate, Brit. Assoc. Report I860, p. 225.
Syn.: Hemioniscus balani, Bucliholz.
Cryptothiria balani, Sp. Bate & Westwood.
Specific Characters. Body of adult female short and broad, star-like, with
7 radiating lobes, the 2 anterior of which are less prominent, sometimes ob-
solete, posterior lobe more conical than the others. Anterior larval part
body sharply defined, and consisting of the head and 3 anterior segments
of the
of meso-
some, with their appendages exactly as in the larva in its last stage. The latter
(and the male) oblong fusiform in shape, with the basal expansion
of the anten-
nulse very broad, and divided into 7 or 8 strong teeth. Colour of adult female,