518 К- Stephensen. 



joints of the stalk, and there seem to be no setæ on the 1st 

 joint, the inner margin of which is drawn backwards in relation to 

 the margin of the 2nd joint. Of the 5 joints of the palp the 4th is 

 by far the largest, whilst the 5th joint is quite short, but broad; 

 both joints have numerous stiff setæ. The exopodite, which is 

 attached to the 2nd joint by means of a true articulation, is fairly 

 large, but does not seem to have borne natatory setæ. The epipodite 

 is quite small. 



The 3rd pair of maxillipedes (fig. 8) resemble a pair of pereiopoda; 

 there is a short, unjointed exopodite and a trilobed endopodite. The latter 

 has the same form and hairiness as in the adult species of the 

 genus Spirontocaris. 



Of the pereiopoda (fig. 8) the 4th and 5th pairs are wanting; 

 pi, p2 and рз have a form quite similar to that in the adult Spiron- 

 tocaris, but the 5th joint on p?. is divided into 3 joints, whilst in the 

 adult it usually has 7 joints. 



The pleopoda (1st— 5tli pairs) (fig. 9) have the ordinary, bifur- 

 cated form. The endopodite and exopodite are lancet-like and bear 

 ciliated setæ; on its inner side the endopodite has a small, arti- 

 culated branch. The 1st pair are much shorter than the others. 



In the uropoda (fig. 10) the two branches are almost equally 

 long, but somewhat shorter than the telson. The exopodite is very 

 nearly elliptical-lancet-shaped with a small tooth on the outer 

 margin; the endopodite is lancet-shaped. 



To judge from the form of the 3rd pair of maxillipedes and the 

 pereiopoda there can be no doubt, that this is a young stage of a 

 Spirontocaris species. The pointed epimeral plates on the 1st — 5th 

 abdominal segments point to Spirontocaris groenlandica ; this species 

 has exactly the same number of spines on the anterior margin- of 

 the carapace as the example described. 



B. Early stage of a Spirontocaris (PI. XL — XLI). 



St. 57. Danmarks Havn, 15 — 20 m. 8 — 8 — 1907. Delesseria region, 

 soft bottom. 1 spec. Total length 13 mm. 



The whole animal very soft and swollen, so that the figure of 

 the habit (fig. 11) is possibly not quite accurate; the first 3 abdominal 

 segments are so swollen, that it was quite impossible to draw* them. 



The carapace with rostrum somewhat more than l/3rd of the 

 length of the whole animal. Rostrum not specially pointed, l/4th 

 as long as the carapace without rostrum. The rostrum has no teeth; 

 on each side, on the other hand, there is a small tooth above and 

 below the eye and on the lower, anterior corner of the cara- 



