88 
the 3 preceding species, not nearly attaining half the length of the body, dorsal 
face evenly vaulted behind, anterior part somewhat exserted, lateral faces sculp¬ 
tured with 3 distinct oblique plicae, the hindmost being bifurcate in its upper 
half; pseudorostral projection slightly prominent, subrostral corners distinct, though 
obtuse. The first 2 pedigerous segments slightly produced dorsally, last segment, 
like the 4 anterior caudal segments, with 2 small juxtaposed tubercles dorsally. 
Eye rather narrow, of oval form. Anterior maxillae with the palp bisetose; 
posterior ones with 5 apical bristles Terminal joint of 1 st pair of maxillipeds 
less rudimentary than in the 3 preceding species, and carrying on the tip a short 
spine and a bristle; that of 2 nd pair with 2 diverging spines having between them 
a third much smaller one. Third pair of maxillipeds rather slender, with the 
meral joint but very little expanded. Second pair of legs with the last joint 
scarcely longer than the 2 preceding ones combined. Uropoda moderately slen¬ 
der, stem smooth, inner ramus somewhat exceeding half the stem in length, and 
armed with about 8 spinules. Colour (in the living state of the animal) pale 
reddish. Length 5 mm. 
Adult male much more slender than the female, with the carapace conside¬ 
rably more flattened, though exhibiting the very same sculpturing. Limbs trans¬ 
formed in the usual manner. Length 6 V 2 mm. 
Remarks. —By the peculiar sculpturing of the carapace, this species is 
at once recognizable from any of the preceding ones. Moreover the carapace is 
of somewhat smaller size and less vaulted above, and in the structure of the 
appendages also some minor differences are found to exist. 
Occurrence. —I have found this form not infrequently along the whole 
Norwegian coast, from the Christiania Fjord to Yadso. It generally occurs in 
depths ranging from 30 to 100 fathoms, on a muddy bottom. 
Distribution. —British Isles (Th. Scott), Heligoland (Ehrenbaum). 
5. Campylaspis undata, G. 0. Sars. 
(PI. LXI), 
Caynpylaspis undata , G. 0. Sars. Om den aberrant^ Krebsdyrgruppe Cumacea, p. 80. 
Specific Characters. — Female. General form of body resembling that in 
(’. costata. Carapace, however, less strongly arched above, with the dorsal face 
very uneven owing to irregular protuberances and ridges, which give the upper 
contour an undulated appearance; lateral faces sculptured with 2 very prominent 
plicse, originating from the hind part and extending in front, the upper one being 
continued on the side of the pseudorostral projection, the lower terminating at 
