28 
diminishing in length, propodal joint in all of them unusually produced and 
carrying at the tip, outside the dactylus, a single spiniform seta. Uropoda fully 
as long as the last 3 segments combined, inner ramus somewhat shorter than 
the basal part, but projecting considerably beyond the outer, its 1st joint with 2 
spinules, each of the other 2 joints with one; outer ramus with the proximal 
joint quite short. Telson about twice the length of the last segment, and much 
shorter than the basal part of the uropoda, gradually tapering distally to an 
obtuse point carrying 3 subequal spines. Colour light yellow, with a whitish band 
across the carapace. Length of adult female about 6 mm., of male 5 */2 mm. 
Remarks .—This is an easily recognizable form, being at once distinguished 
from all our other Cumaeea by the peculiar development of the carapace, the 
fornicate character of which, indeed, makes it rather difficult to obtain an exact 
lateral view of the animal. 
Occurrence .—I first found this remarkable form off the Lofoten Islands, 
and have subsequently met with it occasionally also in some other localities of 
the Norwegian coast, for instance, in the outer part of the Hardanger Fjord, at 
Aalesund, and in the Trondhjem Fjord. It is a pronounced deep-water species, 
only occurring in greater depths ranging from 120 to 400 fathoms. Out of Nor¬ 
way, this form has not as yet been recorded. 
Fam. 4. Leuconidae. 
Characters .—Body more or less slender, with no sharp demarcation be¬ 
tween the anterior and posterior divisions. Integuments rather thin Carapace 
generally small, with the antero-lateral corners more or less produced, pseudoro- 
stral projection in some cases distinctly prominent, in other cases obsolete. 1st 
pedigerous segment well defined. Tail with the last segment obtusely produced 
behind. Eye, in all the known forms, absent. Superior antennae with the outer 
flagellum 3-articulate, the inner uniarticulate. Inferior antennae in female very 
small, in male well developed, attaining the length of the body. Mandibles com¬ 
paratively short, with the body triangular in form, or forming outside an angular 
expansion, masticatory part strongly incurved, with only 2 small setae behind the 
cutting edge, molar expansion short and massive. Anterior maxillae with the 
massive. 
