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 maxillse with the palp bisetose; 

 posterior ones with 5 apical bristles Terminal joint of 1st pair of maxillipeds 

 less rudimentary than in the 3 preceding species, and carrying on the tip a short 

 spine and a bristle; that of 2nd 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 Q 1 /? 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 Vads0. 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. 



(PL LXI), 

 Campylaspis undata, G. 0. Sars. Om den aberrante Krebsdyrgruppe Cumacea, p. 80. 



Specific Characters. Female. General form of body resembling that in 

 C. 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 

 plicae, 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 



