210 
Zooxanthellae as also in Stuckey’s specimens. The sphincter is 
weak, almost palmate circumscript, with rather few but often richly 
ramificated folds (textfigure 17). 
Concerning the mesenteries S tu c k e y States that there are 24 
pairs of which 12 perfect. In a specimen with 48 tentacles there 
Fig.l7. Anthopleura aureo-radiala. Transverse section 
of sphincter. Tentacleside upwards. 
were 24 pairs at the tentacles, 30 pairs in the aboral part of the 
actinopharynx, in another specimen with about 70 tentacles 38 pairs 
in the lower part of the body. If the cycles are indicated by let¬ 
ters the arrangement of pairs was as follows. (dm: directives). 
dm dm 
In the first specimen: 132431342431323132313424313243. 
dm dm 
„ „ second „ 13243134243134243134243154342434134243. 
The mesenteries of the fourth cycle seem to arise earlier in 
the exocoels situated on both sides of the mesenteries of the second 
order than in those bordered on the first. The mesenteries of the 
first, second and at least part of the third order are perfect, the 
