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short and rounded, the second pair short, somewhat produced and strongly converging. 
The lateral margin of the head in its whole length supplied with hairs of medium length; 
somewhat in front of the posterior extremity of this margin begins the line which runs 
upward and backward in a somewhat oblique direction across the side and the back; in the 
latter place the hairs become long, but in this species this line only forms the anterior 
boundary of a broad belt of hairs of medium length, behind which we find the usual naked 
transverse area, which is rather long and also broad; the remainder of the trunk: its sides, 
posterior extremity and ventral surface, are closely covered with hairs, part of which are 
proportionally rather long. The head has empty spaces beneath its skin. The first pair of 
trunk-legs are rather small, with a single, pretty short branch, and a tolerably short and 
thick process on the outer side at its base; the branch ends in two sete, one of which is 
short, the other long, but scarcely the length of the basal joint of the maxillipeds. The 
second pair of legs are of less than medium size, with a shorter outer branch and a some- 
what longer inner branch; the terminal seta of the outer branch scarcely half the length of 
the whole leg, whereas the inner branch has a short seta on its outer side, and the terminal seta 
is nearly the length of that of the first pair of legs. The caudal stylets rather short, each 
with a pair of terminal sete, which are somewhat thicker and longer than the hairs of 
the trunk. 
OVISACS. Only two are found; they are tolerably large and of about equal size; 
the one represented (fig. 2c) somewhat flattened and rather triangular in outline, its longest 
diameter being 59mm. The eggs pretty numerous, about middle-sized. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. The marsupium of Gitanopsis arctica G. O. Sars from Varangerfjord 
(the most northern part of Norway) at Vadsé. Prof. Sars discovered the parasite in a single 
specimen, which he subsequently lent me, and in which were found: one female, one male 
and two ovisacs. 
19. Sphzronella Giardii n. sp. 
(PI. VI, fig. 83a—31.) 
FEMALE. One specimen (fig. 3¢) which has laid six ovisacs and no doubt has 
finished laying eggs, and which is oblong and somewhat shrunk, measures “63 mm. in length 
and -45 mm. in breadth, whereas another female (fig. 3a), which had not yet begun laying 
eggs, is 124mm. long and 131mm. broad — consequently broader than long — and about 
double the length and nearly three times the breadth of the first mentioned specimen. The 
head is proportionally small and well defined from the trunk. The frontal margin is naked 
(fig. 3e). Antennule of medium length, pretty robust, with short apical sete. Antenne 
3 jointed, the second joint longer than the first or the third; the terminal seta of medium 
length. The mouth-border of medium breadth. The maxillule with a good-sized additional 
