Description of Two New Phyllopoda. 9 



more or less vaulted, the posterior, concave. On all the 

 legs the following parts are to be distinguished: the stem 

 proper, or endopodite, the exopodite, the epipodite, and the 

 basal plate, the last 3 issuing from the outer side of 

 the stem (see fig. 5). The endopodite is rather broad and 

 laminar, and terminates in a comparatively large, broadly- 

 rounded lobe, edged with short, ciliated setæ. Above this 

 lobe issue, from the inner edge of the endopodite, 5 other 

 lobes, the 3 outermost of which are rather small and conical, 

 and are each tipped with a limited number of slender setæ 

 (from 3 to 6), some of them rather short and curved inwards. 

 The 2nd lobe from above is somewhat broader and more 

 evenly rounded at the tip, and the uppermost one is much 

 larger still and fully as broad as the succeeding 4 combined. 

 Both these lobes are fringed with a dense and regular 

 series of slender, biarticulate setæ curving inwards and 

 upwards in a falciform manner. Of the above lobes, the 

 uppermost would seem to answer to the coxal lobe in other 

 Plyllopoda, whereas the others represent the so-called endites. 

 The exopodite forms an oval lamella movably articulated to 

 the endopodite, outside its terminal lobe, beyond which it 

 extends considerably. The lamella is edged all round with 

 ciliated setæ increasing in length distally, their number being 

 from 30 to 40. The epipodite is attached at some distance 

 above the exopodite, and has the character of a vesicular 

 lamella of a somewhat spongeous structure, and without any 

 armature whatever. The basal plate issues from the upper 

 part of the endopodite outside, and is very thin and pellucid, 

 of a somewhat elliptical form, with the outer edge finely 

 and regularly serrated. Of the above-described parts, the 

 epipodite undoubtedly represents the true gill; but we have 

 reason to believe that respiration takes place also in the 



