Q Hjalmar Ostergren. [No. 9 



more numerous than usuaL Without calcareous deposits and strong-ly 

 contracted, it would perfectly correspond to the typespecimen of 

 „ Eolo thuria ecalcarea " . ^) 



2. Bathyplotes natans (M. Såes). 



Folden Fiord t»?» 37' N., % 1^00, 530 m., clay, -f 6.550 C. 

 Oxsund 680 N., i^g 1899, 600 m., clay, + 6.30 c. 



This species has up to date only been met with in places with 

 a bottomtemperature of from -|- 6^ to + 7^ C. As far as is known 

 it is only to be found on the coasts of Norway, but as I have 

 formeiiy (1896) pointed out, it is very closely related to the 

 West-European B. tizardi (Théel). 



3. Mesothiiria intestinalis (Ascanius). 



Folden Fiord 67» 37' N., % 1900, 530 m., clay, + 6.550 c, 

 Oxsund 680 ]sr., i^/^ 1899, 600 m., clay, + 6.3» C. 



I am not aware, that this species has ever been found in East 

 Finmark, nor in West Finmark, north of the West Fiord. But 

 according* to Jarzynsky (Wagner 1885), it is to be met with on 

 the Murman Coast. 



Like KoEHLER (1896), LuDwia (1900) thinks, that M. verrilli 

 (Théel) from the southern parts of the North Atlantic (from 12° to 

 about 50° N.) is identical with M. intestinalis. I am still of a diffe- 

 rent opinion. I have received from Koehler a specimen which 

 altogether corresponds with the descriptions of M. verrilli. This 

 specimen differs, as regards colour and the pedicels of the ventral 

 surface, from the hundreds of specimens of the real M. intestinalis 

 which I have seen on the Scandinavian coasts. -) Both species 



^) Hérouard describes (1896) a ne^v SticJiopus from the Bay of Biscay, 

 which he calls St. richardi^ which also E. Perrier (1899 b, p. 300) mentions. 

 Hérouard finds that the species is most like St. ananas (Jæger) from the 

 Pacific. St. 7-ichardi, however, as far as can be seen from the description, differs 

 in no way from St. ircmuhis, the presence of which in the Bay of Biscay is 

 known. Still in 1896 it was not known, that Holothuria tremula Gunn. was a 

 Stichopus. E. Perrier ignores even in 1899 my pamphlets of 1896 and 1897, 

 where I had pointed out this fact, and before him revised the species of the 

 genera Holothuria and Stichopus^ which belong to the Synallactinæ. Cf. also p. 31. 



-) Even E. Perrier (1899 a) considers M. intestinalis and M. verrilli to be 

 different spee ies. Cf. also the appendix, p. 31 — 32. 



