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joint terminating in a short spine. The maxillipeds comparatively short and slender, their 
basal joint almost shorter than that of the maxille. The proximal section of the abdomen 
more than three times broader than the distal section (fig. 21); each of the oblong caudal 
stylets furnished with four setze, the foremost of which is the longest. — Fig. 2a shows 
that this specimen possessed two long frontal threads (s), the proximal parts of which are 
united into one single thread. 
MALE. The largest specimen (fig. 2k and 21) measures to the extremity of the 
caudal stylets -27 mm. in length; breadth -24 mm.; a rather considerable size compared 
with the female (fig. 2b: fig. 2a). So, the body is proportionally only a little longer than 
broad and somewhat depressed. The ventral surface outside the limbs from the base of the 
antennule to the abdomen, the posterior part of the sides, the hindmost part of the back, 
the stout basal part of the trunk-legs and the inner branch of the first pair, are closely 
covered with peculiar, very irregular eminences, which are partly shaped like keels, partly 
like knots or short, acute taps. The median part between the maxillipeds and the trunk- 
legs shows fewer keels and stripes. The dorsal side has very few knots, whereas the front 
part of the head is covered with numerous blunt knots. The mavxillipeds like those of the 
female. The terminal spine on the inner branch of the posterior legs is strongly curved 
and hooked. Of the sete of the caudal stylets, the two apical ones are stout and of sub- 
equal length. — The frontal thread (fig. 2k, s) a little shorter than the animal, simple, slender, 
yet somewhat thickened towards the distal end. 
EGGS. Much smaller, but also much more numerous than in the preceding species. 
In one female were found two somewhat oblong lumps of eggs of about equal size and of 
irregular shape; they did not show any trace of larvee. One of these lumps is exhibited in 
fig. 2c, enlarged to the same scale as the largest female, fig.2a, and a comparison of these 
figures with the male (fig. 2b) will show the relative size. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. On Stenothoé marina (Sp. Bate) from Norway. The locality cannot 
be precisely indicated, but, according to Sars, the host occurs along the southern and western 
coast of Norway up to the Nordland coast (Tjété). I have only seen two infested specimens 
lent me by Prof. G. O. Sars, after whom I have named this remarkable form discovered by 
him. One of the hosts was a female with marsupium, in which were found an adult female, 
a very small female and the two afore-mentioned lumps of eggs, one of which, probably by 
chance, was adhering to the abdomen of the female, whereas the other was free and situated 
more to the front; the female had attached one of its above-mentioned frontal threads to it, 
which I think shows that the animal must have moved after deposing this lump. The other 
host was also a female; its marsupial plates were somewhat smaller, though they appeared 
to be quite developed, being furnished with marginal sets, and in this specimen were found 
an adult female, a male and an empty skin of a somewhat smaller male. 
