226 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



D. violacea, Crn. — On old mussel-shells, Loch Etive. 

 D. SchousbcBi, Born. — On Rhodochorton floridulum. 

 South Connel. 



Cohort II.— N OSTOCHIN^. 



Section 1. Honiocystece. 



Order I.— OsciLLARlACEiE. 



Tribe I— O scillar iese. 



Oscillaria corallinse, Gom. (O. litoralis, Phyc Brit). 



— Recorded by Carmichael as found at Appin "in 



pools along the muddy sea-shore, flooded by spring 



tides." The generic name is, according to Gomont, 



more correctly written " OsciUatoyia." 



Phormidium papyraceum, Gom. {Oscillatoria 

 spiralis, Phyc. Brit.)— "At Appin by rocks where 

 birds are in the habit of nesting" (Carmichael). 



Tribe II.— Ly ngby e se. 



Lyngbya aestuarii, Liebm. {L. ferruginea, Phyc. 

 Bi-it.). — " In small mud-bottomed pools of brackish 

 water, Appin" (Carmichael). In similar situations 

 near Dunstaffnage Point. 



L. majuscula, Harv. — In rock-pools at high tide- 

 mark on small islands opposite Lismore. 



Section 2. Heterocystece. 

 Order II. — Rivdlabiace^. 



Calothrix pulvinata, C. Ag. (C. hydnoides et C. 

 pannosa, Phyc. Brit.).—" Clay sea-shore, Appin " (Car- 

 michael). Ardmucknish Bay. 



C. fasciculata, C. Ag.— On rocks on small islands 

 opposite Lismore, and at Dunstaffnage. 



Rivularia atra, Roth, var. hemisphaerica.— On old 

 Patella shells, and rocks near the Falls of Lora. 



R. nitida, C. Ag. {R. plicata, Phyc. Brit.).— "On 

 rocks at high water, Appin " (Carmichael). On rocks 

 at Dunstaffnage and in the Sound of Kerrara. 



Order V.— Nostocace.^:. 

 Anabeena torulosa, Lagerh. {Spha^rozyga Car- 

 michaelii, Phyc. Brit.).— "On decaying algae, Appin" 



