524 '^- Stephensen. 



a small, oval epipodite oii the outer side. The endopodite seems to 

 be divided into 4 parts but is not jointed in reality. The exopodite 

 is a little longer than the endopodite and ends in 3 (?) pairs of 

 natatory setæ. 



The 2nd and 3rd pairs of maxilli pedes (fig. 37) have exopodites, 

 which are very nearly twice as long as that on the 1st pair, but 

 much heavier and seem to be the true swimming apparatus of the 

 animal; they each have 8 (?) pairs of natatory setæ. Both the 

 mentioned appendages have a thick, two-jointed stalk; there is no 

 epipodite, but this is probably due to the imperfect condition of the 

 animal. The 5 joints in the 2nd pair of maxillipedes are almost 

 equally long except the 4th joint, which is twice as long as the 

 others. The endopodite of the 3rd pair of maxillipedes is twice as 

 long as that of the 2nd pair; the 1st, 3rd and 5th joints are al- 

 most equally long, the 2nd joint twice as long, the 4th joint 3 times 

 as long. 



The pereiopoda (fig. 37) have the usual 7 joints and epipodite, 

 the first 2 pairs also exopodite and end in chelæ. The exopodites 

 are rather short, but little more than half as long as the endopodite. 

 The comparative lengths of the joints can be seen from the figure. 

 The 2nd pereiopod is somewhat longer than the 1st pair. The 3rd and 

 5th pairs of pereiopoda have the same length as the 3rd pair of maxilli- 

 pedes; the distal joint has a small tooth on the inner side. 



The 1st — 5th pairs of pleopoda (fig. 38) have almost the same 

 form as in the previously described stages, but there are no setæ 

 along the margin and the small projection on the endopodite is not 

 jointed; it is not present on the 1st pair. 



In the uiopoda (fig. 39) the exopodite is of the same length as 

 thetelson, the endopodite a little shorter; they are both lancet-shaped. 



To judge from the form of the pereiopoda there would seem 

 to be no doubt, that this animal also belongs to the genus Spiron- 

 iocaris; this is further indicated by the chelæ on the 1st and 2nd 

 pairs and also by the small tooth on the inner side of the distal 

 joint on the 3rd — 5th pairs; the adult namely has 6 — 7 of these teeth. 



11. Erythrops abyssorum G. O. Sars. 



Erythrops abyssorum G. O. Sars: Nyt Magazin f. Naturvid., vol 16, 



1869, p. 326. 

 * — — G. О. Sars: Monografi over Norges Mysider. 



Oversigt over Norges Crust. I. Christiania Vid. 



Selsk. Forh. 1882, p. 36, PI. 5, fig. 1—12. 

 — — Zimmer: "Fauna arctica", vol 3, 1904, p. 448. 



