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of extraordinary length. Pleopoda well-developed, with both ranii biarticulate.
Uropoda of moderate length, and of a similar structure to that in Apseudes.
Remarks. - - This genus has been established by Messrs. Norman & Stebbing,
to include some forms differing from Apseudes, among other things, in the absence
of the scale-like appendage
to the inferior antennae. As another distinctive
character, is mentioned the supposed fusion of the first 2 segments
of the meso-
some with the cephalon ; but this, I believe, is not quite correct. For in the Nor-
wegian species, at any rate, the 2nd segment is well defined from the cephalosome,
though apparently rather firmly
connected with it. As a third characteristic
feature may be mentioned the ven pronounced sexual difference occurring in this
genus, both as to the general form of the body,
and to the structure of the
superior antenna? and the first 2 pairs of legs. The generic name refers to the
peculiar malleolate appearance of the chelipeds, which, especially in the male, is very
conspicuous. We know as yet of 4 species, 2 of which, S. malleolus and S. hides,
were procured during the Porcupine Expedition from very considerable depths,
the greatest being 1460 fathoms, the 3rd, S. serratus Gr. 0. Sars,
likewise from
great depths in the Arctic Ocean, the 4th a Norwegian form, to be described below.
Sphyrapus anomalus,
(PI. Ill & IV.)
G. 0. Sars.
Apseudes anomaltts, G-. 0. Sars, Undersogelser over Christianiafjordens Dj'bvandsfauna, N. Mag.
f. Naturvid. f. 1869, p. 45.
Specific Characters. Body in female scarcely 5 times as long
as it is
broad, in male considerably more slender. Cephalosome with the upper face
evenly vaulted and perfectly smooth, frontal plate broad, rounded, exserted at
the end to a short, finely denticulated point. First free segment of mesosome
somewhat broader than the cephalosome; the succeeding ones much narrower and
defined by deep constrictions; last segment shorter than the others. Metasome
perfectly smooth, with the epimera not at all produced, terminal segment occupying
about y3 of the length of the metasome and obtusely rounded at the tip. Superior
antennae in female about the length of the cephalosome, 1st joint of the peduncle
gradually widening distally, with 4 strong setse on the outer edge, last joint very
small; flagellum scarcely half the length of the peduncle, and 5-articulate, acces-
sory appendage about half its length, and 3-articulate; those in male rather
larger, flagellum more fully developed, 7-articulate, and carrying dense fascicles
of sensory filaments. Inferior antenna? fully as long as the superior, but much
v v
narrower, flagellum & much shorter than the peduncle, and 4-articulate. Chelipeds
2 Crustacea.