183 
in Corynactis is very irregular. In the specimen with 41 pairs of 
mesenteries at least 17, probably 19 pairs reach the actinopharynx. 
In this specimen 3 pairs of directives were present. The other 
sectioned specimen was provided with only a single pair of direct¬ 
ives. The longitudinal muscles of the mesenteries are weak and 
form a very coarse-folded lamella, the parietobasilar muscles are 
weak and not folded, the basilar muscles are lacking. The filaments 
are structured as in other Cory; 7 czc^/s-species. I cannot understand 
what Stuckey means when he States that the filaments in some 
sections “show an appearence of three three-foils“. True enough, 
the inner parts of the mesenteries on some sections look like a 
“three-foiT‘ but these parts belong to the undermost part of the 
actinopharynx, which splits in the middle of its furrows before its 
end. It is probably these lateral processes (furrows-parts of the 
actinopharynx) which very soon end, and which McMurrich 1904, 
p. 295 concerning Corynactis carnea homologizes with the ciliated 
streaks. In faet these processes are no ciliated streaks as far as I can 
see — I have also sectioned Corynactis carnea — although the sup- 
porting cells here are somewhat more numerous than in the 
ridges. These cells are also doser in the outside of the filaments 
than in the inside. 
There are stinging capsules of different size and structure in 
the ectoderm. In the stalk of the tentacles there seems to be 
only common spirocysts present. They are also numerous in the 
caput of the tentacles (here 24 x 1 , 5 —53 x 3 fi) but very sparse 
in the actinopharynx and in the filaments. In the ectoderm of the 
column, in the caput of the tentacles, in the actinopharynx and 
filaments there are large nematocysts with very coiled spiral thread. 
In the filaments they are largest 72 — 88 x 26—29 /(, in the caput 
of the tentacles 65—71 x 13—17 /r, in the actinopharynx 31 — 36 
X 9—10 and in the column 31—41 x 7 // (these nematocysts 
are possibly a little different in structure from the others). In the 
caput, of the tentacles there are also spirocyst-like cnidae with 
visible basal part to the spiral thread. They are somewhat broader 
in their distal parts than in their proximal, and 48—61 x 4 ^ 5—5 
in size. In the actinopharynx cnidae of about the same kind are 
present. They are, however, more opaque, and their spiral thread 
is hardly visible. Also in the column and filaments there are 
