Zoogeographical Investigations in Southern Greenland. 261 
Intermediate stage (Fig. 9). 7—8 mm. The flagellum in ant. 
2 only half as long as the squama. Mxp. 1—3 about the same as in the 
oldest stage. In pl—p2 there are now natatory setae on the exopodite. 
P3—p5 have grown, and the branches are now in articulate connection 
with the peduncle. There are small cleft, but inarticulate, pleopoda 
(pl1, however, is not yet present). The uropoda have now the usual 
setose arrangement. The telson has grown narrower, and spines 6 and 
7 on the posterior edge are now quite small. 
Oldest stage (Fig. 10). 8—9 mm. The rostrum is pointed, flat, 
and not very long; there is a spine above the eye and over and under 
the base of the antennae. There are no dorsal spines on the abdomen, 
as in several of the other larvae described (Nos. 1 and 2); the 6. abdo- 
minal segment, however, has a spine in front of the anus. The sides 
of the telson are almost parallel, which suggests that the larva must 
be an old one; on the posterior edge (including corners) there are 6 
spines, and two pairs of spines on either side of the telson. The antennae 
are not particularly slender, and the flagellum in ant. 2 is only of the 
same length as the squama; only the first segment is separated off from 
the remainder. As in the intermediate stage, there is a spine on the 
under side of the first jomt in the peduncle of ant. 1. With regard to 
the maxillipedes there is nothing to remark; pl—p5 however, have be- 
come articulated, and pl—p2 show some suggestion of chelae. There 
are natatory setae also on the exopodite of p3—p4. Plp1 is now 
apparent, and is cleft, but none of the pleopoda are articulated. 
All stages of this larva are very slender in shape, and are characte- 
rised by the exopodite on pl—p4; the two oldest stages also by the 
spine beneath the anus. 
This being the larva of most frequent occurence in the material, 
there is reason to believe that it belongs to Spirontocaris Fabricii, 
this species being that of most common occurence in the area in- 
vestigated. 
Spirontocaris larva Nr. 4 (Fig. 11). 
Kvanefjord St. 28, 400 m. w. (5/уп), 3 spec. — Bredefjord 
St. 30, Nansen-net, 250—200 m. (15/vir), 1 spec.; St. 35, 400 m. w. 
(16/vın), 2 spec.; St. 50, 100 m. w. (20/уп), 2 spec.; St. 59, 300 m. w. 
(22/v11), about 20 spec. 
Length 9—11mm. This larva is a Mysis stage, there being exopodites 
on pl—p3. The rostrum is thin, slightly longer than the eye (in the 
one of the specimens from St. 50, which is somewhat defective, the 
rostrum is only half as long as the eye). There are spines above the eye, 
and over and under the base of the antennae. No spines on the abdo- 
men. The telson is triangular, with three pairs of spines on the poste- 
rior edge (corners included) and the spine on the side in front of the 
corner. 
