258 K. STEPHENSEN. 
This larva can hardly be determined with certainty. The youn- 
gest stage is somewhat older then the 3. stage of Hippolyte varians 
described by Sars (1 c. supra), p. 11, Pl. 4, fig. 1—7. If we presume, 
as I consider must certainly be the case, that the supra-ocular spine 
is retained until the adult stage is reached, we have then to choose 
between the following species: Sp. polaris, Sp. microceros, Sp. groenlan- 
dica, Sp. turgida, Sp. spinus and Sp. Lilljeborgu. Of these, Sp. spinus 
and Sp. microceros may be excluded, on account of their rarity in the 
waters in question. There is, also, the more reason to consider the pre- 
Wie 
Rostrum ets. 
Fig. 7. Spirontocaris-larva Nr. 2, last stage. 
sent specimen as belonging to one of the remaining species, since these 
are (with the exception of Sp. Gaimardii, Sp. spinus and Sp. Lilljeborgi, 
which may probably be disregarded) the only species of Spirontocaris 
taken by the Danmark expedition in the waters then investigated. 
That it does not belong to Sp. Gaimardii I consider certain, as the adult 
of this species was only taken by the “Rink” at a single place (an Kvane- 
fjord) and there represented by only a single specimen, whereas the 
larva in question was of common occurrence in Bredefjord. 
Sp. polaris may probably also be excluded (vide supra p. 254); the 
larva must therefore be either Sp. groenlandica, Sp. turgida, or Sp. 
Lilljeborgi, and, as already mentioned (p. 254) it seems reasonable to 
suppose that it is m fact the larva of Sp. turgida. The material also 
