VII.-SOME SOUTH ORKNEY ALG^l. 1 



By E. M. HOLMES, F.L.S. 



THK following list* e-imiiM-i-cs the calcareous nlgre submitted to me for identification by 

 Mr K. N. Rudmuse Brown, and, in addition, some fragmentary algnj found adliering 

 to tin'.-'-. The specimens were nil collected at the South Orkneys during the stay of 

 the Scottish National Antarctic Expedition there from March to November 1903 : 



PRASIOLA CRISPA, Ag.* Sp. Alg., p. 146 ; Kiitz. Tab. Phyc., v. tab. 40, f. vi. ; De Toni, 

 Syll. Alg., i. p. 142. Saddle Island, Scotia Bay, Ferrier Peninsula, etc. 



Very common on rocks up to several hundred feet, wherever there is running 

 water in spring. 



Distribution. The species is cosmopolitan in distribution, including Graham Land 

 and (,'nck burn Island, Antarctica. 



ScYTOTHAMNi'S RCGULOsus, Dt Toni, Syll. Alg., iii. p. 454. Scotia Bay, 9-10 

 fathoms, April 1903. 



Distribution. Also recorded from the Magellan Straits and Falkland Islands. 



CBTPTONEMIA LUXCRIANS, J. Ag. ^p. Alg., ii. p. 228. Scotia Bay, 9-10 fathoms, 

 April 1903. 



The undulate margin and parchment-like consistence of this fragmentary specimen 

 indicate that it belongs to the above species. It is recorded from south polar regions 

 by J. G. Agardh from Montague's specimens collected in the Voyage au Pole Sud ; 

 but Hariot failed to trace it in Montague's herbarium, and found only Diicsseria 

 Lyallii, Harv. It is therefore interesting to ascertain that the plant really does occur 

 in the Antarctic Ocean. 



Distribution. Canary Islands, Cape Verde Islands, Brazil, and Martinique. 



IRIDEA, sp. Scotia Bay. Minute cuncate fronds, of about 1 cm. long occur on the 

 stones received, in company with the Lithothamniu, but it is impossible to determine 

 to which of the species known to occur in the Antarctic Ocean this plant belongs. 



PLOCAMIUM SECUNDATUM, Kiitz. Tab. Phyc., xvi. tab. 42. Scotia Bay, 9-10 fathoms, 

 April 1903. 



1 Reprinted from the Journ. of Bat., July 1900. 



1 To thU lilt of calcareous and other alga-, which Mr E. If. Holme* hat kindly drawn up for me, I have added 

 MOM note* on the distribution of the specie*. I hare omitted a few specie*, also recorded in the li*U of Mr and 

 Mn Oepp. R. N. R. B. 



1 This specie* was determined by Mr A. D. Cotton. R. N. & B. 



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