608 



piants, that certain species do not shoot up and flower every year; 

 for example, Epipogon aphyllus. 



III. 



THE GEOGRAPHICAL DISTRIBUTION OF THE SPECIES 

 FOUND AROUND THE FÆROES. 



If we regard the single species as unities, as mentioned on 

 p. 590, and try to gather them into groups according to their dis- 

 tribution, then it will be best to follow Gran and divide the spe- 

 cies into 3 elements: — 1 arctic; 2 boreal; 3 temperate, and 

 begin by distinguishing between neritic and oceanic species, so 

 that we have 6 groups. Such a division will naturally prove un- 

 satisfactory in several cases, as species may occur whose distribu- 

 tion lies almost just exactly between two groups, so that it will be 

 a matter of subjective estimation to which group they are to be 

 referred, as also there are naturally many species the distribution 

 of which are very little known. I have in the accompanying list 

 enumerated the greater part of the species occurring along the 

 Færoes, and have upon the whole followed Gran, but in some 

 few instances my opinion dillers from his 1 , and besides several 

 forms are enumerated in the following list which are not recorded 

 in his lists. 



A. NERITIC SPECIES. 

 1. Arctic-neritic element. 

 (Fragilaria oceanica) 2 . 



2. Boreal-neritic element. 

 Thalassiosira gravida. 



— Nordenskioldii 



Coscinosira polychorda. 

 Biddulphia aurita. 

 Chaetoceras teres. 



diadema. 



debile. 



sociale. 

 Achnanthes taeniata. 



Dinobryon pellucidum. 

 Phaeocystis Pouchetii. 

 Chaetoceras laciniosum. 



contortum. 



cinctum. 



simile. 

 Nitzschia seriata. 



— delicatissima. 

 Rhizosolenia faeroénsis. 

 Gonyaulax spinifera. 



3. temperate-neritic element. 



Thalassiosira gelatinosa. 

 bioen lata. 



1 Cleve's division differs somewhat both from (Irans and mine lefr. Seasonal 

 Distribution, Gdteborg, 1900, p. 10 and following pp.). 



2 Cfr. p. 610, Note. 



