40 Gr. O. Sars. 



longer than the scape, being divided into numerous short 

 articulations, each of which carries posteriorly a single, par- 

 ticularly long natatory setæ. On the outer ramus each joint 

 has moreover anteriorly a short spiniform bristle. 



The oral parts agree exactly with those in the European 

 species L. Irachyura. The labrum (see fig. 5) is narrow 

 linguiform in shape, and finely ciliated on the obtusely rounded 

 extremity, which does not form any terminal lappet. The 

 mandibles (ibid.) are very strong and have their cutting edge 

 divided into several coarse, but short teeth. The 1st pair of 

 maxillæ (see figs 5 & 7) are composed of a rather thick basal 

 part, and a very movable, incurved, masticatory lobe. The 

 latter is rather different in shape from that in the 2 preceding 

 genera (compare PI. 5, fig. 5), being almost falciform, and 

 armed with a rather restricted number of spiniform bristles, 

 the 2 apical ones being very short. The 2nd pair of maxillæ 

 (see fig. 5) are quite rudimentary, each forming only a small 

 cordiform lamella tipped by a minute bristle. 



The legs (see fig. 3) are 12 pairs in number, successively 

 diminishing in size from the 2nd or 3rd pair. The 7 anterior 

 pairs are of essentially the same structure, and exhibit all the 

 principal parts described above in the 3 preceding genera. 

 The stem, or endopodite (see fig. 8), is rather broad and 

 laminar, exhibiting at the base inside a considerably projecting 

 coxal lobe of much the same appearance as the terminal part 

 of the 1st pair of maxillæ, though having a larger number of 

 bristles. Of the endites, the 2 proximal ones have the form of 

 broad lamellar expansions of the inner edge of the stem, each 

 fringed Avith a double row of slender setæ. The 3 outer 

 endites, on the other hand, are produced to narrow, digitiform 

 processes, being generally strongly incurved. The 4th endite 

 is the longest, and carries along the inner edge several short 

 spines in addition to the bristles. The 5th endite is distinctly 

 articulated to the end of the stem and is very slender, exceed- 



