PLATE XXVIII. 
LETTERING ON THE FIGURES. 
acr. . . . . acrorhagia. Old: = = 2 oralidisk: 
ad, tent. . . . adhesive tentacles. | @s.. . . . . esophagus (stomatodzeum). 
bw. . . - ~ body-wall. ws.gr.. . . . esophageal groove (gonidial 
D. .. =. . . directive mesentery. groove). 
dend, tent. . . . Gendritic tentacles. Os oo co a Oehir 
ect. =. ~ » ectoderm: Ds oO oe 2 parapet. 
end... . . . endoderm. periph. tent. . . peripheral tentacles. 
end. mse. . . . Muscular layer of endoderm. sph. . . . . sphincter muscle. 
g- . .. . ~ globular tentacles. (pee 8 6 oa TORRE 
M- . . . = . mesoglea. tent. . . . . tentacle. 
ms. . . . » . mesentery. Us « «= = = WEITUCH. 
Mi. Geoeiee kehiney oh eeMAatoGysta. zoot. . . . . gZooxanthelle. 
nl... . . ~ nervous layer of ectoderm. 
Actinoides Sesere (H. and 8.), (p. 428). 
Figure. 
1. Vertical section of upper portion of body-wall, x about 50 diam. 
2. Section of the sphincter muscle, x about 100 diam. 
Macrodactyla aspera (H. and 8.), (p. 4381). 
8. Section of the sphincter muscle, x about 100 diam. 
4. Vertical section of portion of the body-wall, x about 45 diam. 
5. Transverse section of a portion of a mesentery, x about 14 diam. 
Aulactinia Gelam (H. and 8.), (p. 442). 
6. Section of the sphincter muscle of the specimen from Mabuiag, x 50 diam. 
7. Section of the sphincter muscle of the specimen from Mer, x 25 diam. 
Ivalactis simplex (H. and 8.), (p. 448). 
8. Vertical section of upper portion of body-wall. 
9. Section of the sphincter muscle, x 100. 
Phellia vermiformis, n. sp., (p. 454). 
10. Vertical section of upper portion of body-wall to show the character of the sphincter muscle, x 50. 
11. Transverse section through a directive mesentery at the level of the cesophagus, x 24. 
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