EXPLANATION Or THE PLATES. 333 



magnified. Fig. 4. Cellepora ramulosa, iiat. size. Fig. 5. A cross section 

 of a branch enlarged. Fig. 6. Cellepora Skenei, nat. size. Fig. 7. The 

 same magnifi«!d. Fig. 8. A transverse section. 



PLATE XXXIII. Fig. 1. Cellepora cervicornis, nat. size. Fig. 2. Amagnificd 

 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. Lopralia 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, II, 

 12. Membranipora pilosa. 10, nat. size; 11, cells of, magnified; 12, cells 

 of varietj' y8. 



PLATE XXXV. Fig 1 , 2. Flustra foliacea. Fig. 3, 4. Flustra truncata. 



PLATE XXXVI. Fig. I, 2. Flustra carbasea. Fig. 3, 4. Fl. avicularis. 

 Fig. 5, 6. Fl. Murrayana. Fig. 7, 8. Cellularia avicularia. 



PLATE 'XXXVH. Fig. I, 2, 3. Flustra niembranacea, nat. size and magni- 

 fied. Fig. 4. Flustra lineata. Fig. 5. Fl. carnosa. Fig. 6, 7. Farcimia 

 salicornia. 



PLATE XXXVIII. Fig. I, 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 XLL 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. F'ig. 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 XLIL Fig. I. Alcyonidium hirsutum, of the natural size ; and Fig. 

 % 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 arroics 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 I. 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 or the polype. Fig 6. 

 A back view of the same : copied from Raspail. 



