60 
. 5. Portion of branch with front view of the hydrothec ; magnified. 
DESCRIPTION OF THE PLATES. 
contractile (?) bands are seen passing from the inner side of the hydrothecal valves to the body of 
the hydranth. 
. 
Figs. 6, 7. Sertularella conica. 
. 6. Natural size. 
g. 7. Portion magnified. 
Figs. 8-10. Sertularella amphorifera. 
8. Natural size. 
. 9. Portion of a colony with gonangium ; magnified. 
= 
Hydrotheea still further enlarged. 
RAL VAW IE ese Velie 
Figs. 1, 2. Sertularia marginata. 
. 1. Natural size. 
Distal end of colony, magnified. 
Figs. 3,4. Sertularia tumida. , 
g. 3. Natural size. 
. 4. A portion, magnified. In one of the hydrothecw the hydranth and two opercular bands are still 
visible. 
Figs. 5,6. Sertularia tubitheca. 
t=) 
o, 5. Entire colony, natural size. 
. 6. A portion, magnified. 
Figs. 7,8. Sertularia exigua. 
ig. 7, Colony growing on a seaweed; natural size. 
A portion, magnified. 
Figs. 9,10. Sertularia distans. 
. 9. Natural size. 
10. A portion, magnified. 
Figs. 11,12. Thuiaria sertularioides. 
. 11. Natural size. 
g. 12. A portion, magnified. 
PIN AMO) O/T 
Figs. 1, 2. Thuiaria distans. 
. 1. Entire colony, natural size. 
g. 2. A portion, magnified. 
Figs. 3-6. Thuiaria plumulifera. 
fo) 
Fig. 3. Entire colony, natural size. 
Fig. 4. Portion of a branch with pinne, magnified. 
Fig. 5. Hydrotheca more enlarged, lateral view. 
Fig. 6. Same, front view. 
PaaS DT Bi BxaVelelele: 
Figs. 1, 2. Plumularia filicula. 
Fig. 1. Natural size. 
Fig. 2. A portion with gonangia, magnified. 
Figs. 3,4. Plumularia macrotheca. 
g. 3. Entire colony, natural size. 
ig. 4. A portion of a pinna, magnified. 
Figs. 5,6. Plumularia attenuata. 
ig. 5. Natural size. 
6. Portion of stem with pinna, magnified. 
