2 
PAGE 
Ethology = 0819: — 
Habits, behaviour 
.. 15 
Plankton . . 
• • 
. . 15 
Symbiosis 
. . 
. . 
. . 15 
Variation and Aetiology = 0823 : — 
Evolution 
. . 
.. 15 
Phylogeny 
15 
Distribution = 0827 
Recent : — 
Atlantic and adjacent seas . . 
* , 
16 
Indian and adjacent seas 
.. 16 
Pacific and adjacent seas 
.. 16 
Arctic and Antarctic . . 
.. 17 
Freshwater 
, • 
.. 17 
Geological : — 
Tertiary 
, , 
, * 
17 
Secondary 
. • 
.. 17 
Primary 
.. 17 
Systematic == 083 1 : — 
Hydrozoa (= Hydromedusae) 
.. 18 
Graptolithida 
.. 22 
Scyphozoa (= Scyphomedusae) . . 
.. 23 
Anthozoa 
.. 24 
Alcyonaria 
.. 24 
Zoantharia 
.. 27 
Ctenophora . . 
.. 30 
