THE MARINE ALG^ OK THE OBAN DISTRICT. 233 



Halidrys siliquosa, Lyngb. — Very common on 

 the shores of Loch Etive and Loch Creran. 



Cohort VII. — D ICTYOTINiE. 



Order I.— Dictyotaceje. 

 Dictyota dichotoma, Lamx., var. inflexa, J. Ag. — 

 Fairly abundant in rock-pools on the shores of Loch 

 Etive, and on islands in the Firth of Lome. 



Series lY.—RHODOPHYCE^. 



Cohort I — POBPHYRINJE. 



Order I.— Porphyrace^. 



Qoniotrichum elegans, Le Jol. {Bangia elegans, 

 Phyc. Brit.). — I obtained specimens of a minute 

 filamentous red alga opposite the Black Crofts, Loch 

 Etive, which agree in all respects with the description 

 given in the Phycologia Bmtannica, and with Le Jolis' 

 diagnosis. 



Bangia fuscopurpurea, Lyngb— Fairly common 

 at various situations on the coast. 



Porphyra ciliaris, Crn. {Bangia ciliaris, Phyc. 

 Brit.). — "On Zostera, Appin" (Carmichael). 



P. laciniata, C. Ag. — This species was plentiful 

 both in Loch Etive and on the islets in the Firth 

 of Lome. 



Erythrotrichia carnea, J. Ag. {Bangia ceramicola, 

 Phyc. Brit.).— "On other algae, Appin" (Carmichael). 



Cohort II. — N KM ALIGNING. 



Order I. — Helminthocladiace.s;. 

 Tribe I. — Chantr ansiese. 



Chantraneia Daviesii, Thur. (Callithamnion 

 Daviesii, Phyc. Brit.). 



Ch. virgatula, Thur. {Callithamnion virgatulum, 

 Phyc. Brit.). 



Both these species are common on other algse in 

 Loch Etive and Loch Creran. 



Ch. secundata, Thur. — On Cladophora rupestris 

 on islets near Lismore. 



