2 
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Ethology = 0819: — 
Habits, behaviour 
.. 14 
Plankton . . 
. . 14 
Symbiosis 
. . 14 
Variation and Aetiology = 0823 : — 
Variation. . 
. . 14 
Phylogeny 
.. 14 
Distribution = 0827 
Recent : — 
Atlantic and adjacent seas . . 
.. 15 
Indian and adjacent seas 
, , 
. . 15 
Pacific and adjacent seas 
. . 15 
Arctic and Antarctic 
9 # 
. . 16 
Freshwater . . 
.. 16 
Geological : — 
Secondary 
. . 
.. 1G 
Primary 
.. 16 
III. Systematic = 083 1 : — 
% 
Hydrozoa (= Ilydromedusae) 
.. 17 
Graptolithida 
.. 20 
Scyphozoa (= Scyphomedusae) . . 
.. 21 
Anthozoa 
.. 21 
Alcyonaria . . . . 
.. 21 
Zoantharia 
. . 24 
Ctenophora . . 
.. 27 
