PLATE XXIII. 
Figs. 1, la. — Grammaria stentor (p. 48). 
Fig. 1. — A colony ; natural size. 
Fig. la. — Part of a colony; magnified 10 diameters. 
Figs. 2, 2a, 2 h . — Grammaria magellanica (p. 48). 
Fig. 2. — Part of a colony ; natural size. 
Fig. 2a. — Part of the same ; magnified 10 diameters. 
Fig. 2b. — Transverse section of a branch ; magnified about 20 diameters. 
a. Three hydrothecse belonging to the same plane seen in section. 
b. Distal extremities of three hydrothecse belonging to a plane immediately below that of a. 
c. Sections of three hydrothecse which lie in a plane immediately above that of a, and which, ' 
as the section passes through them nearer to their origin, are still filled with the proximal 
part of the hydranth. 
d. Section of the axial tube. 
e. Peripheral tubes seen in section. 
Figs. 3, 3a, 3b. — Grammaria insignis (p. 49). 
Fig. 3. — Part of a colony ; natural size. 
Fig. 3a. — Part of the same ; magnified 10 diameters. 
Fig. 3b. — Transverse section of a branch ; magnified about 20 diameters. 
a. Two opposite hydrothecse, seen in section. 
b. Distal ends of two hydrothecse which alternate with a, and lie in a plane immediately below 
that of a. 
c. Sections of two hydrothecse which lie in a plane immediately above that of a. As the section 
passes through them near their origin, the proximal part of the hydranth is still contained 
in them. 
d. Section of the axial tube. 
e. Peripheral tubes seen in section. 
