Zoogeographical Investigations in Southern Greenland. 255 
pairs more at either corner. There are fine setae between the bristles. 
The uropoda may be seen through the telson, lying inside the integum nt. 
Despite the resemblance to Larva Nr. 2 (the spines on 4.—5. ab- 
dominal segment) this is distinctly of another species. Its metamor- 
phosis is far more arrested, is seen from the “adult” form of the pe- 
reiopoda and the large pleopoda, as compared with the still undeveloped 
telson. If the supraocular spines are preserved until the adult stage 
is reached, then it should (vide p. 258) either belong to Sp. polaris, 
un 
Rostrum etc. 
Fig. 5. Spirontocaris polaris?, the first freeliving stage. 
to Sp. groenlandica, Sp. turgida, or Sp. Lilljeborgii. It shows a remark- 
able resemblance to the figure which Kroyer gives of the embryo of 
Sp. polaris (Monograf. Fremstill. Sl. Hippolytes nordiske Arter, Kgl. 
Danske Vid. Selsk. math.-naturvid. Afh., vol. 9, 1842, p 245 (37), Pl. 6, 
fig. 120—32). 
Making allowance for the fact that Kroyer’s figures and descrip- 
tion are based upon embryos, where spines, etc. could hardly be expected 
to be developed, while the present larva was taken as a free living stage, 
the resemblance is in all other respects so great as to leave, in my opi- 
nion, but little doubt that the larva here in question actually is the first 
free stage of Spirontocaris polaris. 
