CLASSIFICATION OF ACTINIARIA 501 
and useful distinction between the Ilyanthids and the (more 
or less) adherent forms, even though in special instances the 
Tlyanthid condition is partly retained or imitated by others. 
Text-fig. 7 shows the contrast between the two states. The 
conversion of the base into a definite float as in Minyas 
provides a third useful type. 
Among the forms without acontia or mesogloeal sphincters 
one cannot make use of presence or absence of cinclides as 
might have been hoped. They have here excited so little 
interest that not much trouble has been taken to find them, 
and the range of their distribution is not really known. They 
are recorded in some forms such as Peachia and Haren- 
actis, and I must record here that I have personally observed 
them very clearly in a species of Phymanthus—quite an 
unexpected find. It seems to me not unlikely, from noticing 
the ways of living anemones, that there may be discovered 
cinclides of some sort (even if only acrorhagial perforations) 
in some or even many families. A study of Actinia equina, 
Anemonia sulcata, Bunodactis gemmacea, and 
Tealia crassicornis in this connexion might reveal 
something quite interesting—and attention should be paid 
to the thin region just near the edge of the base, as well as to 
the rest of the body. 
Among Stichodactylines we have to deal with characters 
of quite a clear-cut sort affecting form and arrangement of 
tentacles, and these provide simple and satisfactory family 
distinctions. (See Text-figs. 2, B, 14, 15, 19.) 
Taking these remarks, together with the similar ones in 
Part I, we may list some of our more useful characters as 
follows : 
Presence or absence of (i) a definite base, (ii) a float, (in) cin- 
clides, (iv) a distinction of the body into regions, (v) vesicles, 
(vi) a mesogloeal sphincter, (vii) acontia, (vill) mesogloeal 
disc-and-tentacle museles, (ix) a division of the mesenteries 
into macro- and microcnemes, (x) macrocnemes over and 
above six pairs, (xi) perfect mesenteries over and above six 
pairs, (xii) more tentacles than one in connexion with some or 
