disc, 
ect., 
eCi. CaN., 
ect. m., 
BP Bp 0 
end., 
end. m., 
Id the 
Sos., 
gl. C., 
Fo GPa 
Go Bp 
ine., 
Oo Bop 
lac., 
Figure 
1. Homostichanthus anemone. 
2. Actinoporus elegans. 
3. Corynactis myrcia. 
PLATE XY. 
LETTERING ON THE FIGURES. 
column wall. 
cell-islet. 
ciliated streak (Flimmerstreif). 
cuticle. 
directives. 
disc. 
ectoderm. 
ectodermal canal. 
ectodermal muscle layer. 
encircling sinus. 
endoderm. 
endodermal muscle layer. 
fibrillar layer. 
fossa. 
gland cell. 
gonidial groove. 
glandular streak. 
(Driisenstreif, Nesseldriisenstreif). 
incrustations. 
intermediate streak, 
lacune. 
x 25. 
Mi, 
m. fil. 
MES., 
mg. St., 
mr. M., 
NEM, 
nr. ley 
ob. m., . 
p. b. m., 
per. st., 
i Eilon oc 
TY. Mey 
Ps Sor 
QD the 
sl. d., 
Sp., . 
sph. m., 
St., 
tent., 
Z00X., 
Les elos hile OCC same 
x 820. 
mesentery. 
mesenterial filament. 
mesoglea. 
marginal stoma. 
macrocnemic mesentery. 
nematocyst. 
nerve layer. 
oblique muscle. 
parieto-basilar muscle. 
perioral stoma. 
reflected ectoderm. 
retractor muscle. 
reticular streak. 
sulcar directives. 
sulcular directives. 
spermarium. 
sphincter muscle. 
stomodeum. 
tentacle. 
zooxanthelle. 
orders of mesenteries or tentacles. 
Transverse section through the knob of a tentacle. x 320. 
Radial section through the wall of the fossa and across the sphincter 
Transverse section through a mesentery a little below the stomodeal region. 
The mesenterial filament at the free edge is simple, while the endoderm behind is swollen, 
giving somewhat the appearance of a trilobed filament. 
4. Parazoanthus tunicans. Transverse section of a polyp through the lower part of the stomodeum. 
5. Parazoanthus tunicans. 
[ 220 ] 
The lacune represent the spaces from which the calcareous incrustations have been dissolved ; 
the sponge spicules remain, x 50. 
Section through a fold of a mesentery containing three spermaria, x 820. 
