264 K. SrEPHENSEN. 
gellum consists of 2 joints. Mxp. 1—3 have the usual larval character, 
with 2 exopodites, and pl—p3 are almost alike, without any indication 
of a chela on pl—2. No trace of pleopoda. The telson is triangular, 
and was doubtless armed on its posterior edge with 7 pairs of spines, 
the middle pair quite small. In the uropoda, the exopodite and endo- 
podite are not separated from the peduncle by articulation; the endo- 
podite has two bristles at its poimt, while the exopodite is furnished 
with the usual setose arrangement. 
I am unable to determine this larva, which, as shown above, dif- 
fers very considerably from the Spirontocaris larve hitherto described; 
on purely negative grounds, however, it may with some degree of cer- 
tainty be considered as belonging to the genus Spirontocaris. 
All Greenland genera of Macrura are known in their larval stage (By- 
thocaris and Sclerocrangon have no larval developement); with the excep- 
tion of Nectocrangon, Glyphocrangon and Hymenodora. Of these, Gly- 
phocrangon is so rare as to be out of the question here, while Hymenodora 
has practically speaking only been found in E. Greenland waters, and is not 
known from W. Greenland. (I have not been able to consult Montt- 
CELLI and Lo Bianco’s work on the developement of Gennadas elegans, 
in Monitore Zool. Ital., vol. 11, suppl., Roma 1900). There remains 
then, only Nectocrangon lar, and I cannot but admit a certain degree 
of probability that the larva in question may belong to this species; 
with its long rostrum and generally slender shape, it resembles several 
of the Crangonid larvae described by Sars; this is, however, of course 
but a very slight foundaticn for conclusion. Far more important is the 
fact that none of Sars’ Crangonid larvae, not even the oldest stage, 
have any exopodite on p3, a poimt which weighs heavily against the 
probability of the present specimen being a Crangonid. We may there- 
fore, with a very fair degree of certainty, refer it to the genus Spirontocaris. 
Spirontocaris groenlandica jay. (Fig. 13). 
Bredefjord St. 48 (19/vm), 5 
spec.; St. 61, 12,5—13 m. (22/v1), 
nl 3 spec.; St. 66, 9—11 m. (23/vit) 
ee about 10 spec.; St. 89, 16—17 m. 
P* 
(31/vit), 5 spec. 
In the Danmark Exped. (p. 516, 
Pl. 39) I described the young stage 
of Spirontocaris groenlandica (?); as 
amatter of fact, in view of the elong- 
ated lateral parts of the abdominal 
pe 
segments, there can be no doubt that 
Fig. 13. Spirontocaris groenlandica this determination Wd eC ORECE IE 
juv. Rostrum etc., telson and base As will be seen from the above, 
of p1—p2. my own collections now include a 
