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91
of the length of the hist peduncular joint, its 1st joint not twice ;is long as the
other 2 combined. 1st pair of legs with the. proximal part of the dactylus com-
/
paratively longer and more expanded than in A, longicornis. Male resembling
that of the latter species, though somewhat less slender. Colour uniformly greyish,
scmipellucid, without any patches. Length of adult female 13 mm.
Remarlcs. This form is also very nearly allied to the type species, and
may. at first sight, easily
be confounded with it. It is, however, of far inferior
size and of somewhat less slender form. On a closer comparison, moreover, some
differences in the structure of the several appendages may be found to exist,
showing it to be evidently specifically distinct. The uniform greyish
colour is
another character by which this form may be easily distinguished from ^1. loiuj'i-
cornis, which always exhibits a, more or less variegated colouring.
Occurrence. I first discovered this form off the Lofoten Islands, in the con-
siderable depth of 25o to 300 fathoms. Subsequently
I have found it rather
abundantly in the inner part of the Trondhjem Fjord, in depths ranging from
100 to 200 fathoms, sometimes clinging to deep-water Hydroids and Gorgonids,
sometimes to the spines of Echinus detjaus Dill). & Koren. Out of Norway it
has not yet been recorded.
4. Astacilla pusilla, G. 0. Sars.
(Pi. XXXVII, fig. 3.)
An-lui us ptisiUits, G. 0. Sars. Uidrag til Kuinlskaben om Dyrelivet pa;i vore H;ivl>anker.
Cliv. Vicl. Selsk. Foi-h. 1872. p. 93.
XjH'cifie Characters. Body of female less slender than in the type species,
and very tubercular, some of the tubercles assuming a spiniform character.
Cephalon with 2 very conspicuous juxtaposed pyramidal prominences
above in the
middle. Each of the 3 succeeding segments with a transverse row of 4 tubercles,
the 2 uppermost being rather prominent. Middle segment of mesosome coarsely
tubercular both dorsally and laterally, the tubercles being subequal in size. The
3 posterior segments of mesosome, as also the metasome, likewise distinctly tu-
bercular dorsally. Superior antenna.' about as in A. a ffinis. Inferior antennae
with the riagellum very small, its 1st joint not being longer than the other 2
combined. Colour uniformly light yellow. Length of adult female scarcely ex-
ceeding 8 mm.
Remarks. In the general form of the body, this species somewhat re-
sembles A. affinis. It is. however, of rather inferior si/e, and much more tuber-
cular. The colour also is different.