22 G. O. Sars. 



inside, an obliquely transversal row of falciform delicate 

 setæ, outside, a longitudinal row of much coarser plumose 

 bristles (see fig. 6). The 5 endites are all well defined, the 

 3 upper ones being, however, but slightly prominent, whereas 

 the 4th, especially on the anterior pairs (figs. 4, 5), is 

 strongly produced, forming a linguiform lobe reaching almost 

 to the tip of the 5th endite. The latter is movably articulated 

 to the end of the stem, and has the form of a narrow 

 oblong blade edged outside with long plumous setæ. On 

 each of the preceding endites there is a double series of 

 more or less strongly curved, thin, Particulate setæ. The 

 exopodite is divided into a dorsal and a ventral lappet, the 

 latter being the larger, though in the anterior pairs not 

 extending quite to the tip of the endopodite. The dorsal 

 lappet in the 1st pair (fig. 4) is very small, whereas in the 

 succeeding pairs it is much more developed, though not 

 extending nearly to the tip of the exopodite. Fig. 1 on 

 PI. IV represents a leg of the 8th pair, showing the great 

 development of the epipodite, which is more than twice as 

 long as the dorsal lappet of the exopodite, and terminates 

 in an acute point. In this pair, as also in those immediately 

 preceding and succeeding it, the ventral lappet of the 

 exopodite extends considerably beyond the end of the 

 endopodite, whereas the 4th endite of the latter has become 

 considerably shorter than in the anterior pairs. In the 9th 

 and 10th pairs (see PI. II, fig. 2; PI. IV, fig. 2) the dorsal 

 lappet of the exopodite is prolonged to a slender thread- 

 like lash, tapering to a fine point (fig. 2 a), and extending 

 upwards into the dorsal cavity of the shell, where it serves 

 for keeping in place the egg-mass there accumulated. Fig. 3 

 on PI. IV represents a leg of the 15th pair magnified to 

 the same scale as the previously described legs. As shown 



