2 
PAG B 
Ethology = 0819: — 
Habits, behaviour . . . . . . . . . . 13 
Luminosity . . . . . . . . . . 14 
Habitat . . . . . . . . . . . . . . 14 
Instinct and Psychology . . . . . . . . 14 
Symbiosis; commensalism .. .. .. .. 14 
Parasitism . . . . . . . . . . . . 14 
Variation and Aetiology = 0823 : — 
Variation . . .. .. .. .. ..14 
Phytogeny .. .. .. .. .. .. 14 
Evolution . . . . . . . . . . . . 14 
Distribution = 0827 
Recent : — 
General .. .. . . .. . . .. 14 
Atlantic and adjacent seas . . . . . . . . 14 
Indian and adjacent seas .. .. .. .. 15 
Pacific and adjacent seas . . . . . . . . 15 
Arctic and Antarctic . . . . . . . . . . 15 
Freshwater .. .. .. .. .. ..15 
Geological : — 
Quaternary . . . . . . . . . . . . 15 
Tertiary . . . . . . . . . . . . 15 
Secondary . . . . . . . . . . . . 15 
Primary .. .. .. . . .. .. 1G 
III. Systematic = 083 1 : — 
Ilydrozoa (= Hydromedusae) .. .. .. .. 1G 
Graph toli thida .. .. .. .. .. .. 18 
Scyphozoa (= Scyphomedusae) .. .. .. .. 18 
Anthozoa .. .. .. .. .. .. .. 18 
Alcyonaria . . . . . . . . . . . . 18 
Zoantharia .. .. .. .. ... ..22 
Ctenophora .. .. .. .. .. .. ..27 
