PLATE XXX. 
LETTERING ON THE FIGURES. 
CRs a 6 6 9 Medoydeiraitry. Oth oc o 5 5 Cihobite, 
ad. tent. . . . adhesive tentacles. @s.. . . . . cesophagus (stomatodseum). 
bw. . . . « body-wall. @s.gr.. . »« . cesophageal groove (gonidial 
D. directive mesentery. groove). 
dend. tent... . . dendritic tentacles. hs ct 4 o Otis 
ect. ectoderm. js oo 8 1 9 9 Teele 
end. . . endoderm. periph. tent. . . peripheral tentacles. 
end. msc. . . . muscular layer of endoderm. sph. . . . . sphincter muscle. 
g- globular tentacles. (Be Goo 6 6 oo Wea, 
m. mesoglea. tent. . . . . tentacle. 
ms. mesentery. v os « « ec « Werruca. 
Ne nematocysts. zoom. . . . . zooxanthelle. 
fh th o nervous layer of ectoderm. 
Corynactis hoplites (H. and §.), (p 467). 
Figure. 
1. Transverse section of the head of a tentacle to show the nematocysts of the ectoderm, x about 450 
diam. 
2. Vertical section through the upper portion of the body-wall to show the sphincter muscle, x about 
100 diam. 
3. Semi-diagrammatic section through the cesophageal region to show the arrangement of the 
10. 
11. 
mesenteries, x 20 diam. 
. Transverse section through the base of a mesentery. 
Stichophora torpedo (Bell), (p. 464). 
. Diagrammatic section through the cesophageal region to show the arrangement of the mesenteries, 
x about 8 diam. 
. Semi-diagrammatic section through the sulcular (‘‘ dorsal”) region of the body in the cesophageal 
region, x 15 diam. 
. An imperfect, and part of a perfect, mesentery, x 50 diam. 
. Sketch of a characteristic transverse section of the retractor muscle of a mesentery, x 50 diam. 
. Vertical section through the upper portion of the body-wall to show the sphincter, x about 100 
diam. 
Sphincter muscle, x about 200 diam. 
Mesenterial filament, x 145 diam. 
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