I9I5- Duke. — Sojnc Marine Algae of Comity Cork. 55 



and r. arhuscula is fairly abundant on the perpendicular 

 and horizontal faces of the rocks a little below high-water 

 mark : a band of Porphyra vulgaris occurs just above it. 



Ptiloia plumosa was for several days hunted for in vain, 

 but finally turned up after a storm, ha\'ing been washed 

 ashore on the stipes of Laminaria Cloustoni. There must be 

 a fairlv abundant growth of it in the deep waters of Court - 

 macsherry Bay ; the coast -hne extending for about two 

 miles westwards from Garrettstown was examined, and P. 

 plumosa and its host were found in several places as well as 

 on Garrettstown Strand. 



With regard to Cork Harbour, practically all the recent 

 collecting has been done on the western side. At Spike 

 Island, just within the mouth of the harbour Xitophyllu))i 

 Hilliae has been found. Myrtle\ille, which is outside the 

 mouth of the harbour has pro\'ided several interesting 

 species, e.g.. Antithamnioii crispum, Gloiosiphonia capillaris, 

 and y itophyllum Bonnemaisoni. 



The list of the rarer Irish species with the names of the 

 locahties, dates when collected, and names of collectors is 

 given below. The S3'stem of classification adopted is that 

 used in Rabenhorst's " Kryptogamentlora" by Dr. Ferdinand 

 Hauck. 



I am much indebted to Mr. A. D. Cotton, Royal Gardens, 

 Kew, for verifying and naming certain critical specimens. 



RHODOPHYCEAE. 



Monospora pedieellata Ag. — Cork Harbour, Dr. J. R. Harvey. 



Scinaia furcellata Bivona. — (i.) Cork Harbour, 1836, Dr. J. R. Harv^ey. 



(2.) Ballycotton, July, 1836, Miss Ball, 

 Antithamnion crispum Thur. — M\-rtleville, August, 191 1, Major H. A. 



Cummins. 



Callithamnion arbuscula L>Tigb. — Old Head of Kinsale, August, 1914. B. 

 E. Duke. 



Callithamnion cruciatum Ag. — Cork Harbour, Dr. J. R. Harvey. 

 Callithamnion plumula Ellis. — Corkbeg, August, 1837, Dr. J. R. Harvev. 

 Callithamnion tetragonum Ag. — (i.) Bantry Bay, October, 1850, Isaac 



Carroll. (2.) Courtmacsherry Bay, August, 1914, B. E. Duke. 

 Callithamnion spongiosum Harv. — Bantry Bay, July, 1878, I. Carroll. 

 Callithamnion scopulorum J. Ag. — Ringabella Bay, March, 1914, B. E, 



Duke. 



