496 T. A. STEPHENSON 
specimens. If this idea can influence the study of anemones, 
it will turn the attention of some workers in the direction of 
refuting it by minute research and measurement ; and others 
towards ‘ leaving it at genera’ and looking into the matters 
of living form and broader group-problems, in any case resulting 
in better knowledge of the group. Special detailed studies 
of individual families should yield good fruit. In some cases 
at least further work would reveal interesting and instructive 
similarities and variations running through all the members 
of a given family, but of a kind beyond the scope of the short 
definitions to which a paper like the present is limited. It 
would also reveal which families are more and which less 
homogeneous, and help to clear up ideas of relationships. 
I have made a preliminary study of the Chondractinudae, 
for instance, which promises to be interesting in this sense. 
Once more I wish to record hearty thanks to several friends 
who have given me their aid in one way or another, especially 
to Professor H. J. Fleure for much kindness, and to Captain 
A. K. Totton, M.C., for kind help with literature and specimens 
at South Kensington. I am also much indebted to Professor 
Stanley Gardiner for the loan of a collection of specimens 
without the aid of which it would have been very difficult to 
complete the paper. 
Some of the illustrations in this paper are copied from other 
sources. Text-fig. 14, K, is copied from Plate 22, No. 2, in 
W. Saville-Kent’s ‘The Great Barrier Reef of Australia ’ 
(W. H. Allen & Co., Ltd., 100 Southwark Street, S.H. 1) ; 
Text-fig. 19 is from a photo by Saville-Kent in ‘ The Naturalist 
in Australia’, p. 224 (Chapman & Hall, Ltd., 11 Henrietta 
Street, W.C. 2), and later on printed in ‘ Marvels of the 
Universe’, p. 1135 (Messrs. Hutchinson, Paternoster Row, 
B.C.) ; Text-fig. 9 is copied from ‘ Journ. Mar. Biol. Soé.’, 
N.S., vol. x, no. 1, 1918, p. 73; Text-fig. 8 is from ‘ Sei. Trans. 
R. Dublin Soe.’, ser. ii, vol. iv, 1889, Pl. 35, fig. 1. I wish 
to acknowledge with thanks permission to print my versions 
of these figures, from Messrs. W. H. Allen, Chapman & Hall, 
and Hutchinson, Dr. E. J. Allen, the Science Committee of the 
