120 THE VOYAGE OF H.M.S. CHALLENGER. 



Lithothamnion brassica-fiorida, Harv. 



Lithothamnvm brassica-florida, Harv. ex Dickie in Journ. Linn. Soc. Lond., xiii. p. 179 ; Melliss, 

 St Hel., p. 382. 



St Helena. — Growing to some extent in the shallow pools, and also cast up with the 

 shingle on the beach along the southern or windward coast. It is a good deal perforated 

 by a small Lithodomus, the shells of which are found perfect in some of the holes — Melliss. 



Also found in Algoa Bay. 



Melobesia farinosa, Lamour. 



Melobesia farinosa, Lamour., Polyp. Flex., p. 315, t. 12; Kiitz., Sp. Alg., p. 696; Dickie in Journ. 

 Linn. Soc. Lond., xiii. p. 179 ; Melliss, St Hel., p. 382. 



St Helena. — Found adhering to Laurencia cruciata— Melliss. 



Widely spread in the Atlantic and Pacific; also in the Mediterranean, and on the coast 

 of Eastern Australia. 



Gelidiace^e. 



Pterocladia lucida, R. Br. 



Pterocladia lucida, R. Br. ex J. G Agardh, Sp. Alg., iii. p. 545 ; Harv., Phyc. Austr., t. 248 ; Dickie 

 in Journ. Linn. Soc. Lond., xiii. p. 170; Melliss, St Hel., p. 382. 



St Helena. — Growing on limpet shells, which are cast ashore rather plentifully along 

 the coast — Melliss. 



Common on the western and south-western and eastern coasts of Australia and New 

 Zealand ; also occurring on tbe coast of Ceylon. The specimens from St Helena are very 

 small, only about an inch high ; but Dr Dickie states that there is doubt as to the genus 

 or species. 



Helminthoclade/e. 

 Liagora viscida, K. A. Agardh. 



Liagora viscida, K. A. Agardh, Sp. Alg., i. p. 395; Kiitz., Sp. Alg., p. 538; Dickie in Journ. Linn. 

 Soc. Lond., xiii. p. 180; Melliss, St Hel., p. 382. 



St Helena. — In shallow pools on the windward coast ; rare — Melliss. 



Azores ; Mediterranean ; Red Sea ; Ceylon ; Mauritius ; Eastern Australia ; West Indies. 



Galaxaura lapidescens, Lamour. 



Galaxaura lapidetrens, Lamour.; Dickie in Journ. Linn. Soc. Lond., xiii. p. 180; Melliss, St Hel., 

 p. 381. 



St Helena.— Shallow pools ; rare— Melliss. 



Atlantic; Polynesia; Sandwich Islands; Mauritius. 



