1902] The Holothurioidea of Northern Norway. 11 



Prof. Sluitek has kindly given me the opportunity of seeing- 

 the specnnens of „Psohis t^quamahts'^ from Barents Sea. These are 

 young' oiies of Ps. fahricii, or perhaps such of Ps. 2)hcmtapus, these 

 species being in a early stage often difficult to distinguish from 

 each other. Quite certain is, that these specimens do not belong 

 to Ps. squamatus. 



In the large collections from the Arctic Ocean, which I have 

 seen, Psolus fahricii and Ps. yhantaims have been the only repre- 

 sentatives of the genus Psolus, and according to my opinion, all 

 specimens, recorded from the region of the arctic fauna as Ps. 

 squamatus, belong in reality to one or other of the two first men- 

 tioned species.^) 



I have not seen any genuine Ps. squamatus from any place 

 further north than the Trondhjem Fiord (64° N.). But here this species 

 is quite common. It is therefore very probable that it goes further 

 northwårds, and it may possibly be found in the warmer of the 

 fiords in West Finmark, as is the case with many other species, 

 e. g. Cucumaria hispida. Therefore it may remain in the list over 

 the Holothurians of Northern Norway, principally on M. Sårs' 

 authorily, although its existence there must not be considered to 

 be fully proved. 



10. Trochostoma boreale (M. Sårs). 



Is not in Nordgaard's collection, neither has anybody else 

 found it within the region, which he has explored. It is known at 

 Ox Fiord 70° 10' N., 370 m. (M. Sårs 1861), Porsanger Fiord 

 70° 54.8' N. and Tana Fiord 70° 47.5' N., 232 m. (Danielssen & 

 Koren 1882). Further south it is met with only at rather great 

 distances from the Norwegian coast. 



11. Ankyrodertna jeffreysii Danielssen & Koren. 



Caught in Norway in Porsanger Fiord and Tana Fiord together 

 with the preceding species (Danielssen & Koren 1882). I have 



J) On this account, I also doubted Bell's statement (1882) that Ps. squa- 

 maiu^ Avas to be found in the Gulf of St. Lawrence, about 48^ N., as on the 

 east coast of America an arctic sea fauna predominates in that latitude. Pro- 

 fessor Bell was good enough to send me his specimen, and I found it to be a 

 Ps. fahricii. 



