par) 
28 Alf Wollebæk. [No. 12 
equally long specimens, both females. The extremities too of All- 
manni are in the main of a more slender structure. However the 
chela of the 1st pereiopod of Allmanni is rather more distally 
expanded, as may be seen in the habitus-figures or again in figs. 2, Å 
ao 2 18, | 
It is now some years since G. 0. SArs pointed out in his 
work on the metamorphosis ') of Crangonids that the generic differ- 
ences were far more marked in the larvae-stage than in the fully- 
developed individuals: and he further drew attention to unmistak- 
able and conspicuous dissimilarities in larvae of 
8 the same genus: as for instance the distinct 
DE difference between Urangon vulgaris and Allmanni 
Fa = er 
Kin. For to quote merely one example it is å 
constant well-defined characteristic of the larvae 
S3 of UC. vulgaris that they have a posteriorly-directed 
pe dorsal projection on the 3rd abdominal segment 
(fig. 1 å), whereas this is not to be found on the 
larvae of Allmanm (fig. 1 b). There do not 
seem in my opinion to be any more special reasons why UC. All- 
manni should be classified as a sub-species of U. vulgaris than 
could be urged in the case of many other closely allied species. 
PUR 
Geographical Distribution: Römer and Sornauprnn found 
C. Allmanmi in the mouth: of the White Sea, a locality which 
F. Dornzin in his previously-mentioned work declared to be the 
most northerly point at which the species had been found, since 
"Island, der nordlichste Punkt för Allmanmni, sowie die alaskischen 
Fundorte von affimis liegen weiter siidliech als der Eingang des weis- 
sen Meeres.” In Norse literature there had already existed for some 
years å work by eurator SPARRE-SCHNEIDER *Undersøgelser af dyre- 
livet i de arktiske fjorde” IV (Tromsø Museums Aarshefter, 14, 
1891), in which this species is mentioned as occurring in the Malangen 
Mord 1692 SN Hat: 
Habitat: On the soft muddy bottom iu the deeper portions 
of the eastern fiords (about 60 meters or more) C. Allmanmi is 
the commonest cearid after Pandalus borealis, Kr. and Pontophilus 
1) G. 0. Sars: Bidrag til kundskaben om Decapodernes Forvandling II & 
III, Archiv. for Mathm. og Naturv., Kristiania, 1889 and 1890. 
