180 DR. G. DICKIE ON ST.-HELENA MARINE ALGZE. 
Mr. Melliss found it on the shells of Limpets cast on shore on 
the northern or leeward side of the island. 
Geographica] Distribution:— West and south-west coasts of 
Australia, New Zealand, Ceylon; specimens from the latter are 
also very dwarf. 
Family HELMINTHOCLADIER. 
Liagora viscida, Forsk. 
Geographical Distribution: — West Indies, Azores, Indian 
Ocean, Red Sea, Eastern Australia. 
Galaxaura lapidescens, Lamx. 
A single specimen, small, but quite Decree ed 
Geographical Distribution :— Canaries, Red Sea, Indian Ocean, 
Mauritius, Madagascar, Australia. x 
Family CRYPTONEMIACES. 
Grateloupia filicina, Wulf. 
The ordinary form, 2 to 3 inches in length, and also the var. 
ramentacea. 
Geographical Distribution :—Atlantic shores, Canaries, Me- 
diterranean, East Indies, Ceylon, Java, Cape of Good Hope. 
Family CERAMIACER. 
Centroceras clavulatum, Ag. 
Very dwarf, growing attached to Corallina carinata. 
Geographical Distribution :—Florida, Mediterranean, Canaries, 
Indian Ocean, Rio Janeiro, Callao, Vera Cruz, Cape, Mauritius, 
Sandwich Islands, Tahiti, Australia, Tasmania, New Zealand. 
Griffithsia setacea, Ellis. 
Very dwarf, and adherent to other species. 
Geographical Distribution :—Atlantic and Mediterranean coasts 
of Europe, Canaries, New Zealand, Australia. 
III. CHLOROSPERME. 
Family SIPHONACEZ. 
Codium tomentosum, Stackh. 
Very dwarf. 
Geographical Distribution :—Nearly cosmopolitan, throughout 
tropical and temperate oceans in both hemispheres ; Antarctic 
seas. 
