16 G. O. Sars. 



distiüct transverse suture, dividing it into 2 successive seg- 

 ments. The proximal segment carries outside the epipodite, 

 which is of a similar fusiform shape to that of the 1st pair, 

 though somewhat smaller, and having the posterior lappet 

 not doubled upon the adjacent part. The distal segment of 

 the stem is very broad, transverse, gradually expanding in- 

 wards to the very prominent masticatory lobe, which ter- 

 minates in a conical lappet carrying 4 delicate ciliated setæ 

 of inconsiderable size, 2 apical and 2 lateral. Above this 

 lappet occurs a group of 4 rather strong incurved setæ, the 

 uppermost of which is almost spiniform, the other three 

 distinctly biarticulate and densely ciliated in their distal 

 part. Along the lower edge of the segment is a row of 

 6 strong claw-shaped spines successively increasing in length 

 distally, all being distinctly biarticulate, with the distal joint 

 coarsely spinulous inside. Moreover, at some distance from 

 the end a small rounded lobe, ünely ciliated at the tip, is 

 seen projecting beyond the edge behind the above-mentioned 

 row of spines. The endopodite, as in the 1st pair, issues 

 from the end of the stem, opposite the masticatory lobe, 

 and likewise consists of 2 well marked joints, each carrying 

 a spine of a similar structure to those of the distal seg- 

 ment of the stem, but considerably longer. The spine issu- 

 ing from the tip of the last joint is especially elon- 

 gated and rather strong, being evidently well adapted for 

 taking hold of algæ or other submerged objects. Outside 

 the endopodite, a rather small hyaline lamella is seen issu- 

 ing from the end of the stem, and undoubtedly representing 

 the exopodite. It is somewhat cordiform in shape, and car- 

 ries only a single small ciliated seta curved downwards. 



The 3rd pair of legs (fig. 8) are considerably smaller 

 than the 2 preceding pairs, from which they also differ in 



