232 TRANSACTIONO, NATURAL HISTOKT SOCIETY OK GLASGOW. 



Cohort II.— Laminarin^. 

 Order I.— Scytosiphokace^. 

 Scytosiphon lomentarius, J. Ag. (Chorda lomen- 

 taria, Phyc. Brit). — Fairly common on the shores of 

 islands in the Firth of Lome and in Loch Etive. 



Phyllitis fascia, Kiitz. (Laminaria fascia, Phyc. 

 Brit).— Occasionally in Loch Etive. 



Order II.— Chobdace^. 

 Chorda fllum, Stackh. — Very common on the coast 

 generally. 



Order III — LAMiNARiACEiE. 



Laminaria saccharina, Lamx.— Common, passivt. 



li. eacchariua, var. phyllitis, Le Jol. (L. phyllitis, 

 Phyc. Brit.). — On rocks near the Falls of Lora. 



L. digitata, Edm. 



Li. hyperborea, Foslie. 



Both these species are exposed at low tide, and are 

 generally distributed. 



Cohort v.— FuciN^. 

 Order I.— Fucace^. 



Fucus vesiculosus, Linn. — I obtained not only 

 the common form, but also var. baltica, J. Ag., on 

 islands in the Firth of Lome. The type species is 

 of course ubiquitous. 



F. serratus, Linn.— The type form is abundant 

 everywhere, and the var. latifolia, Turn., occasionally 

 occurs at low water-mark. 



F. platycarpus, Thur. 



F. ceranoides, Linn. 



Ascophyllum nodosum, Stackh. 



Pelvetia canaliculata, Decne. et Thur. 



All these four species are fairly common on the 

 coast generally. 



The common mussel (Mytihis edulis) has a peculiar 

 distribution in Loch Etive; it is invariably found 

 firmly attached to the roots of Ascophyllum nodosum. 

 I never found it anywhere else in the district, either 

 free on rocks or at the root-discs of Fucus. 



