Jheringula paiilensis, a new generic Type of Macrothricidæ. 17 



several points. The stem also in this pair exhibits a slight 

 geniculate bend, and projects at the end into 2 diverging pro- 

 minences of about equal size, the inner one representing the 

 masticatory lobe, the outer the endopodite. The masticatory 

 lobe is of comparatively simple structure, conically produced, 

 and only provided with 2 small ciliated setæ, one apical 

 curving downwards, the other attached outside the tip, and 

 extremely minute. The endopodite is less distinctly defined 

 from the stem than in the 2 preceding pairs, and only shows 

 slight traces of a subdivision into 2 joints. It carries on 

 the obliquely truncated tip 3 rather thick and finely ciliated 

 setæ, and along the inner edge in all 8, similar setæ arranged 

 in 2 sets, the inner one perhaps more properly belonging 

 to the stem itself. Outside the latter the epipodite is seen 

 in its normal place, being rather small and of simple oval 

 form. The exopodite, on the other hand, is very fully de- 

 veloped, forming an oblong plate of a very delicate struc- 

 ture, and carrying 4 densely plumose setæ, 3 of which issue 

 from the tip, whereas the 4th is attached at a short distance 

 from the base outside, and extends upwards. This plate is 

 very mobile, and in the living animal is swung at regular 

 intervals. 



The 4th pair of legs (fig. 9) are very small and difficult 

 to examine, owing to their very fragile consistency. The 

 stem is much shortened, and carries outside a very small 

 rounded epipodite. Its inward-turning edge is nearly straight, 

 and is divided into 6 soft digitiform processes, whose 

 distal part is setiform and finely ciliated. Between the 

 2 upper and the 4 lower processes, moreover, a short denti- 

 form prominence occurs, and the part above this prominence 

 may more properly answer to the masticatory lobe in the 

 preceding pairs. From the end of the stem below, projects 



2 — Archiv for Math, og Naturv. R. XXH. Nr. 6. 

 Trykt den 12te Mai 1900. 



I 



