10 Hjalmar Ostergren. [No. 9 



pellucidiis only in the number of tentacles. As also Ludwig (1900, 

 p. 155) propounds the question: „ob nicht tiberhaupt Orcula hartliii 

 und PhyUopliorus drummondii identisch sind", so will probably even 

 he now be wilhng' to give up the genus Orcula, the keepmg of 

 which seems to me perfectly unwarranted. 



8. Psolus phantapus (Steussenfelt). 



S. Beier Fiord, between Sandliorno and Sand, 670 5' j^_^ 31^^ i899, 30 — 150 

 m., cla3\ 



Ostnes Fiord 68» 20' N., i-^/o 1899, 50—70 m., clay and stones. 

 Mehavn 71» 2' N., 270 50' E., sept. 1894. 



The spedes is spread over the whole of Finmark up to Var- 

 anger Fiord (M. Såes, 1861), and also on the Murman Coast (Jae- 

 zynsky). 



9(?). Psolus squamatns (Koeen). 



Thei^e is no specimen of this species in Noedgaaed's collection. 

 But there are several references made to it by other authors, by 

 whom it is said to have been found in northern Norway. M. Såes 

 (1861) mentions it from Lofoten, 0. Bidenkap (1899) from Tromso, 

 M'Andeew and Baeeett (1857) from West Finmark. According 

 to Peeeeee (1890), it has even been cauglit on the Murman Coast, 

 and according to Sluitee (1895), in the Barents Sea. 



Thanks to the kindness of the Directors of the Museums of 

 Hamburg and Tromso respectively, I have been able to examine 

 Peefeee's and Bidenkap's specimens, and found tliem to be young 

 ones of Psolus ])hantainis. Young specimens of these species re- 

 semble each othei* very much indeed. In Ps. phantaims, till it 

 attains a length of about 2 cm., the body is also highly depressed 

 and the pedicels are confined to the two lateral ambulacra (odd 

 ambulacrum naked). Both species ai'e, however, also in an early 

 stage usually easy to distinguish from each other through the cha- 

 racters of the scales and of the calcareous bodies of the sole — 

 cf. DiJBEN & Koeen (1846) and Théel (1886). Ps. sqaamatus 

 is especially to be recognized by the calcareous bodies of the sole 

 being simple, smooth or slightly knobbed reticulate plates. Already 

 by this characteristic this species may be distinguished, even in small 

 specimens (they must, however, have attained a length of 5 mm.), 

 not only from Ps. phantapus, but also from Ps. fabricn (DtJB. & 

 KoE.) and Ps. jayonicus Osteege. Adult specimens of these 

 species are easily recognizable on exterior characteristics as well. 



