CLASSIFICATION OF ACTINIARIA 52:7 
varying as to sphincter from weak and diffuse to fairly strong 
and circumscribed—with too many grades to draw a line 
anywhere (a few are illustrated in Text-figs. 11 (p,F) and 
12 (p,n)). And Actinioides is one of the genera hitherto 
Text-ric. Ll. 
fs 
Vertical sections of the sphincters of some Actiniidae, all drawn to 
same scale; showing various grades. a, Condylactis (here 
the sphincter is ahsent or practically so, what is shown being 
simply the upper part of the ordinary endodermal circular 
muscle), B, Actinia equina; c, Bolocera tuediae; 
p, Bunodactis gemmacea; F, Anemonia sulcata; 
r, Bunodactis alfordi. 8B and c are typical diffuse 
sphincters. D, FE, and F are more of the circumscribed-diffuse 
grade. In all of them mesogloea is black, ectoderm and endo- 
derm white. 
classed as Actiniid. Proceeding still further towards the typical 
Actiniidae, if a comparative study of, for mstance, Buno- 
dactis (Anthopleura) alfordi, a Condylactis, 
and Anemonia sulcata be made, there is too much 
Nn2 
