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EXPLANATION OF THE PLATES. 
PLATE XVII. Fig. 1, 2. Plumularia falcata. Fig. 3. The vesicle magnified. 
Fig. 4, 5. PI. pinnata, of the natural size and magnified. 
PLATE XVIII. Fig. 1, 2. Plumularia pennatula, from a specimen presented to 
me by J. E. Gray, Esq. Fig. 3, 4, 5. PI. setacea, 4, is from specimens 
sent from Cork by Mr Thompson. 
PLATE XIX. Fig. 1, 2, 3, Plumularia cristata. Fig. 4, 5. PI. myriophyllum, 
from a Devonshire specimen given to me by Dr Coldstream. 
^ PLATE XX. Fig. 1. A variety of Plumularia cristata. Fig. 2,3. Plum, fru- 
tescens : specimen from Mr Bean. 
PLATE XXI. Fig. 1, 2. Laomedea geniculata. Fig. 3, 4. Laomedea gela- 
tinosa. 
PLATE XXII. Fig. 1, 2. Laomedea dichotoma, nat. size and magnified. 
Fig. 3, 4. Campanularia verticillata. 
PLATE XXIII. Fig. 1. Laomedea gelatinosa, variety, from a specimen in the 
collection of Dr Coldstream. Fig. 2. Campanularia? dumosa, variety. 
Fig. 3. The same magnified Fig. 4. C ? dumosa. Fig. 5. The same 
magnified. 
PLATE XXIV. Fig. 1, 2, 3, 4. Virgularia mirabilis, from specimens sent to 
me by Dr Coldstream. Fig. 5, 6. The same, copied from Muller. 
PLATE XXV. Fig. 1. Gorgonia verrucosa, reduced one half. Fig. 2. Gorg. 
placomus, copied from Ellis. Fig. 3. Gorg. anceps, also copied from Ellis. 
PLATE XXVI. Alcyonium digitatum, nat. size, with its polypes fully ex- 
panded. 
PLATE XXVI.* Alcyonium digitatum. Fig. 1. The Polype as it appears 
when fully extruded and seen through a magnifier. Fig. 2. The Polype 
when about to develope itself, and about one-third protruded. Fig. 3. A 
view of the oral disk after the animal has been killed by immersion in fresh 
water, and the piece placed between two plates of glass. Fig. 4. A view 
of the upper part of the body compressed between plates of glass. Fig. 5. 
A view of a transverse section of the polypidom, highly magnified, shewing 
the longitudinal canals cut across, and the ova in them. Fig. 6. A cell still 
more highly magnified to shew the developement of the ova. Fig. 7. The 
spicula. 
PLATE XXVII. Actinia gemmacea, natural size. 
PLATE XXVIII. Actinia Dianthus. 
PLATE XXIX. Fig. 1. Vesicularia spinosa, a small and perfect specimen. 
Fig. 2. Specimens of the same as they are found when cast on the shore. 
Fig 3. A portion of the same magnified ; the cells have fallen off. Fig. 4. 
A portion with the cells remaining : copied from Thompson. Fig. 5, 6. 
Valkeria imbricata. Fig. 7, 8, 9. Valkeria pustulosa. For the specimens 
which furnished these figures I am indebted to Mr Thompson. 
PLATE XXX. Fig. 1, 2. Crisia cornuta. Fig.. 3, 4. Crisia eburnea. Fig. 5, 
6. Cr. luxata. Fig. 7, 8. Anguinaria anguina. Fig. 9, 10. Hippothoa 
catenularia. 
PLATE XXXI. Fig. 1, 2,3. Tubulipora patina. Fig. 4, 5, 6. Tubulipora 
serpens. Fig. 7, 8. Tubulipora Obelia, Fig. 9, 10, 11. Discopora hispida. 
Fig. 12, 13. Notamia loriculata. 
PLATE XXXII. Fig. 1, 2. Cellepora pumicosa, nat. size. Fig. 3. The same 
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