302 



300 metres, 4 gatherings: Siinedra Ulna , TabeUarin flocculosa, 

 Cijmbella parua, Achnantlws lanceolata, Fragilaria capucina, Meridian 

 circiilare, Frustiilia inilgaris, F. saxonica, Eiinolia impressa, Diatoma 

 hiemale. 



375 metres, 1 gathering: Melosira creimlala. 



450 metres, 1 gathering: Dialoinn Balfouriana, Tabcllaria floccu- 

 losa, Achnantlies niinutissiina, Nauicnia per])usilla, Eiinotia incisa, 

 Naviciila trin. biceps, Caloneis lepiduln. 



550 metres, 1 gathering: Navicula Rotæana, Eunotia Diodon minor. 



The only one of these gatherings which appears lo me to have 

 a more decidedly polar or alpine character is the gathering from 

 450 m. from Hojcljæld on Bordo, it is especially characterized l)y 

 the freqnent occurrence of Diatoma Balfouriana; of olhcr polar or 

 alpine species it contains: Nauicula Irinod. biceps, Nanicula lepidula, 

 Anomoeoneis zeltensis and Fragilaria lævissima var. undulala. Fra- 

 gilaria lævissima is a new species llrst fonnd hy P. T. (Meve in a 

 gathering from Cape Flora and descrihed and ligured hy him in 

 his »Diatoms from Franz-Josef Land« 1898. 



As menlioned ahove the species and varieties from salt and 

 brackish water included in this paj)er have heen mel witli in a 

 few gatherings only, but such forms also occur dis})ersed in ga- 

 therings which are evidently collected from pure freshwaler. Such 

 a form is particularly Surirella Moelleriana. A. Schmidt mentions 

 this species as occurring in three different piaces: Holstein; Pensa- 

 cola and Lodgie Coldstone (Scotland). De Toni says (Syllog. p.595) 

 ad Holstein, in portu Pensacola and ad o ras Scoliæ. Therefore 

 it appears to be a saltwaler form. I do not know if it occurs 

 along the coasts of the Færoes, if it is found Ihere we may pre- 

 sume that it has ])een carried thilher by the Gulf Stream; but as 

 is the case with other marine forms which are fbund dispersed in 

 gatherings of freshwater forms it may also have been conveyed 

 thither by the agency of the birds, perhaps in their dung. But it 

 is possible that Surirella Moelleriana is a freshwater form and that 

 it has been carried out into the sea along the coasts by the fresh- 

 water, the faet of ils having been found in the three above-mentioned 

 localities may therefore be thus explained. Surirella Moelleriana 

 occurs in Van Heurck's Types No. 17 which consists of strictly 

 freshwater forms from Caermarthen in England. In the list of 

 names il is menlioned as Surirella Mdlleri. 



