85_ 



Terminal joint of 1st pair of maxillipeds rather small, conical. with a single small 

 apical bristle; that of 2nd pair with 4 strong spines increasing in length from 

 before backwards. Third pair of maxillipeds rather robust, with the joints partly 

 serrate on the edges, meral joint considerably expanded, equalling in length the 

 2 succeeding ones combined. Second pair of legs with the last joint considerably 

 produced and very narrow, exceeding in length the 2 preceding joints taken 

 together. Tropoda not much elongated, stem coarsely serrate inside, inner ramus 

 about half its length, and armed with about 8 spinules increasing in length distally. 

 Colour bright red, frontal lobe and adjacent part of the dorsal face opaque white. 

 Length 5 mm. 



Adult male considerably more slender than the female, with the anterior 

 division of the body less tumefied. Carapace comparatively shallower, with the 

 pseudorostral projection shorter and more obtuse. Uropoda more elongated, stem 

 clothed inside with about 12 minutely ciliated setae, of which the 5 outer ones are 

 rather elongated, inner ramus comparatively longer than in female and having a 

 greater number of spinules inside. Colour as in the female. Length about 6 mm. 



Remarks. -As above stated, this form was originally described by Prof. 

 Lilljeborg as a species of the genus Cuma, and was subsequently subjected to a 

 closer examination by the present author. It is the first species noticed, and 

 may therefore be regarded as the type of the genus. From the other known 

 species it is easily recognizable by its bright red colour and the perfectly smooth 

 and strongly vaulted carapace. In the latter respect it only agrees with one of 

 the other Norwegian species, viz., C. glabra, whereas in the remaining species 

 the carapace exhibits a more or less pronounced sculpture, either in the form of 

 tuberculiform protuberances, or oblique plicre. 



Occurrence. I have found this form in several places on the Norwegian 

 coast, from the Christiania Fjord to Vads0, though nowhere in any abundance. 

 It generally occurs in depths ranging from 30 to 100 fathoms, on a muddy bottom, 

 in which it conceals itself with great dexterity. It moves rather rapidly through 

 the water, but only for a short while, very soon again sinking to the bottom by 

 its own weight. Adult males are found occasionally together with the females. 

 They are, as usual, much more agile, swimming about with great speed by the 

 aid of their numerous well-developed exopodites. 



Distribution. Kullaberg (Lilljeborg). Kattegat (Meinert), Arctic Ocean in 

 Lat. 75 45' (the present author), Greenland, off Hosteinsborg (Norman), Atlantic 

 coast of North America (Verrill). 



12 Crustacea. 



