1908] Decapod Urustaceans. 31 
1876 —78 were concerned the development of the ova was in no case 
so far advanced that this point could be definitely decided. The 
smallest specimens of this species which he found living at the 
bottom had a length of from 16—18 mm., and differed in their 
build from larger ones chiefly in having å more slender body, com- 
paratively larger frontal horns and more acute projections on their 
limbs. ; 
In subsequent works on the Metamorphosis of Decapods*) SArs 
has deseribed the larva of Sclerocrangon boreas, Prirrs, taken from 
the egg. Apart from this the smallest specimens ot Sc. boreas which 
Sars had at his disposal were 11 mm. long. Even these specimens 
however, had all the characteristics of the full-grown animal 
without any larval-appendages or other indications of the larval 
condition. 
Å comparison between the embryo and the smallest specimens 
found living at the bottom led Sars to conelude that the young of Sele- 
rocrangon either pass through an extremely brief metamorphosis or 
else that they undergo none at all. Sars considers that the latter 
supposition is the more probable, and his view receives support from 
the assumption that no larval-stage of Seleroerangon has hitherto 
been found living at the bottom. 
However four years previous to the publication of this work 
of G. O. Sars, Cart KorrLszer had in *Crustaceen, Pycnogoniden 
und Arachnoideen von Jan Mayen”*) mentioned finding small larvae 
of. Selerocrangon salebrosus Own (= feroæ G. Q. Sars) which 
remained clinging to the underside of the mother's body. KOorLBEL 
gives å short description of one of these larvae which had a length 
of 11—12 mm. 
During the expedition of s/s *Michael Sars” in the Northern 
Sea in 1900 a number of berried individuals of Seleroeramgon ferox 
were taken in the waters east of Iceland on the 28th July in 64 
48" N. lat. 10% 14' W. long, 350 fathoms, the ova of which were 
in an advanced stage of development. 
Among the ova, through the shells of which the larvae 
within could be clearly seen, there were also found other larvae 
that were hateched but still clinging to the body of the mother. So 
1) Archiv f. Mathem. og Naturv. 1890. 
2) *Die Österreichische Polarstation Jan Mayen”, Beobachtungs-Ergebnisse, 
g IT B. 
