SERIALARIA LENDIGERA. 185 



CELLULARIA REPTANS. 

 (Creeping Cellularia.) 



The Cellularia polyzoa has a mixture of horny and cal- 

 careous matter; the cells have an oblique opening, each 

 with four or five short spines : it is a very common species 

 on fucus, in circular branched tufts. 



CELLULARIA CTLIATA. 



A delicate little pearly-white coralline, often found amidst 

 the bunches of red sea-weed the Ptilota sericea espe- 

 cially. The cells are at the tips of the branches, and armed 

 with five very long calcareous spines, which are so brittle 

 that you seldom get them mounted perfectly; and over 

 the mouth a most exquisite little operculum, transparent 

 yet firm, closes the door against intrusion, and falls back 

 when the twelve or sixteen ciliated tentacles come forth for 

 food. 



CRISEA EBURNEA. 



The Ivory-tufted Coralline, common on such sea-weeds 

 as Delesseria and Dasya, also on the roots of the La- 

 minaria which has been thrown by a rough sea upon the 

 beach. Finely granulated pear-shaped vesicles are often 

 scattered over its branches ; it is strongly calcareous ; the 

 cells tubular, with circular apertures looking towards oppo- 

 site sides. 



CRISIA CORNUTA. 



The Goafs-horn Coralline, more rare, and parasitical on 

 other zoophytes. This is a very minute species, with long 

 tubular cells, shaped like goat's horns, and placed one over 

 the other. A fine hair-like bristle projects from the side of 

 each cell, and speckled oval-shaped gemmse are often found 

 on the branches. 



SERIALARIA LENDIGERA. 



The Nit Coralline. Large tangled masses of Serialaria 

 often lie upon the sea-sand after a storm, or come ashore 



