EXPLANATION OF THE PLATES. 
333 
magnified. Fig. 4. Cellepora ramulosa, nat. size. Fig. 5. A cross section 
of a branch enlarged. Fig. 6. Cellepora Skenei, nat. size. Fig. 7. The 
same magnified. Fig. 8. A transverse section. 
PLATE XXXIII. Fig. 1. Cellepora cervicornis, nat. size. Fig. 2. Amagnified 
view of old or mature cells. Fig. 3. The cells from near the edge of the 
divisions. Fig. 4, 5. Transverse sections of the branches. 
PLATE XXXIV. Fig. 1, 2, 3. Lepralia coccinea, 1, nat. size; 2, a few of 
the cells magnified ; 3, the cells with their ovarian opercula. Fig. 4. Le- 
pralia variolosa. Fig. 5. Lep. trispinosa. Fig. 6. Lep. ciliata. Fig. 7. Lep. 
nitida. Fig. 8. Lep. immersa. Fig. 9. Flustra tuberculata. Fig. 10, 11, 
12. Membranipora pilosa. 10, nat. size; 11, cells of, magnified; 12, cells 
of variety &• 
PLATE XXXV. Fig. 1, 2. Flustra foliacea. Fig. 3, 4. Flustra truncata. 
PLATE XXXVI. Fig. 1, 2. Flustra carbasea. Fig. 3, 4. FI. avicularis. 
Fig. 5, 6. FI. Murrayana. Fig. 7, 8. Cellularia avicularia. 
PLATE XXXVII. Fig. 1, 2, 3. Flustra membranacea, nat. size and magni- 
fied. Fig. 4. Flustra lineata. Fig. 5. FI. carnosa. Fig. 6, 7. Farcimia 
salicornia. 
PLATE XXXVIII. Fig. 1, 2. Cellularia ciliata, nat. size and magnified. 
Fig. 3, 4. Cell, reptans. Fig. 5, 6. Cell, scruposa. 
PLATE XXXIX. Acamarchis plumosa, of the natural size and magnified. 
PLATE XL. Eschara foliacea, reduced one half, with portions magnified to 
shew the cells. 
PLATE XL I. Alcyonidium gelatinosum. Fig. 1 and 2, specimens of the na- 
tural size to shew the variations to which the species is subject in outward 
form. Fig. 3. The polype removed. This figure was made in the year 
1833 ; and is less accurate than that of Dr Farre’s. Fig. 4, 5. Alcyonidium 
parasiticum. 
PLATE XL II. Fig. 1. Alcyonidium hirsutum, of the natural size ; and Fig. 
2, a portion of the surface as seen through a magnifier. Fig. 3, 4. Alcy- 
onidium echinatum. Fig. 5. Cliona celata. Fig. 6. The spicula of the 
same. 
PLATE XLIII. Cristatella mucedo, copied from Turpin. Fig. 1. The poly- 
pe at the period of its birth, magnified. Fig. 2. The same when fully de- 
veloped : a , the transparent margin ; b, the disk of the polypidom ; c, the 
holes whence the polypes protrude ; d, the neck of the polypes and anus ; 
e, the tentacular arms, with the mouth at their base ; f the filaments which 
fringe the tentacula : the arrows mark the direction of the currents of water. 
Fig. 3. The tentacular filaments very much magnified to show their cilia. 
PLATE XLIV. Alcyonella stagnorum. Fig 1. natural size and appearance. 
Fig. 2. A longitudinal section. Fig. 3. A portion of the surface magnified. 
Fig. 4. A transverse section. Fig. 5. A front view of the polype. Fig 6. 
A back view of the same . copied from Raspail. 
