PLATE XVIII.a. 
LETTERING ON THE FIGURES. 
b.can.,. . . . basal canal. mes. sph. m., . . mesogleal sphincter muscle. 
(a) Serre 1:)Uest=t (7p mes. C., . . . ~ mesogleeal cells. 
Gin o > ectoderm. mes. lac., . . . mesogloeal lacune. 
ect. fd.. . . . ectodermal folds. p.b.m, . . .  parieto-basilar muscle. 
d. mes. sph. m., . double mesogloeal sphincter muscle. mem.,. . . . . nematocysts. 
end., endoderm. by 6 696 o 0 -Oh\pibeh 
end.m., . . . endodermal muscle. @3., . . . . . esophagus. 
iner., . . . . incrustations. p.gr., . . . . pigment granules. 
MES. . mesogloea. sub-cu,, . . . « sub-cuticla. 
(CBI G0 6 oD mesentery. WH 6 0 1 0 6 spermarium. 
mest. fil, . . . mesenterial filament. zoov., . . . . zooxanthellae. 
Figure. 
1. Zoanthus Solandert, Les. (p. 835). Vertical section through a portion of the column-wall, x 50. 
2. Zoanthus flos-marinus, Duch. and Michl. (p. 339). Vertical section through a portion of the 
column-wall, x 50. 
3. Zoanthus pulchellus (Duch. and Michl.), (p. 341). Vertical section through a portion of the 
column-wall, x 200. 
4. Zoanthus pulchellus (Duch. and Michl.), (p. 841). Transverse section through a portion of the 
column-wall and a fertile mesentery, x 50. 
5. LIsaurus Duchassaingi (Andres), (p. 846). Vertical section through the upper portion of the 
column-wall, x 25. 
6. Lsaurus Duchassaingi (Andres), (p. 846). Section through a portion of the mesoglea of the 
body-wall, showing cells with peripheral granular protoplasm, x 250. 
7. Gemmaria variabilis, n. sp. (p. 850). Vertical section through a portion of the column-wall, 
x 25. 
8. Gemmaria variabilis, n. sp. (p. 850), Transverse section through a portion of the column-wall 
and a fertile mesentery, x 200. 
9. Gemmaria variabilis, n. sp. (p. 850). Transverse section through a portion of the column-wall 
and a perfect mesentery in the region of the cesophagus, x 50. 
10. Gemmaria fusca, n. sp. (p. 54). Vertical section through a portion of the column-wall, x 40. 
[ 380 ] 
