12 G. O. Sårs. 



few densely ciliated setæ. The palp is of a rather delicate, 

 membranous consistency, and is divided into several seti- 

 ferous lappets. Outside at the base, a rather broad, but 

 only slightly prominent lobe is seen, fringed with 9 particu- 

 larly long and densely plumous setæ. This is the so-called 

 vibratory plate, or branchial lamella, as it is termed by 

 other carcinologists. Opposite this plate, on the inner side, 

 2 small, juxtaposed lobules issue, each carrying at the tip 

 a restricted number of rather strong curved setæ. No parts 

 corresponding either to these lobules or to the vibratory 

 plate are to be found on the mandibles, all these parts 

 belonging in fact to the 1st basal joint of the palp, which, 

 as above stated, in the mandibles is very small and quite 

 simple. The remaining part of the maxillar palp, however, 

 so strongly resembles the mandibular palp, that the cor- 

 responding parts cannot fail to be recognized. It consists 

 of the 2nd basal joint and the 2 terminal rami. The basal 

 joint forms a slight bulging inside, edged with 4 ciliated 

 bristles, and carries on the tip the inner ramus. This is 

 uni-articulate, though a distinct setiferous ledge on the 

 inner edge seems to indicate its original composition of 

 2 joints; from the tip of the ramus 4 very slender setæ 

 issue, extending more or less outwards. The outer ramus 

 is movably attached to the basal joint near its base, and is 

 likewise uni-articulate, forming an oval lamella fringed with 

 7 slender setæ. 



The anterior maxillipeds (fig. 9) are each in form of a 

 short and thick stem curved anteriorly, and divided into 7 

 unequal joints, which carry in front strong spines and setæ, 

 partly issuing from separate digitiform lobules. Of the joints, 

 the 1st is much the largest, and exhibits anteriorly 2 short 

 lobules, each of which carries inside a single claw-like spine. 



