ZOOLOGY. 267 



5. Isis. Coral. Animal assuming a plant-like appearance; 



stem stony, jointed, the joints longitudinally striated, 

 united by spongy or horny junctures, and covered by a 

 soft cellular barkj the cellshesei with oyiparous polt/pes. 



6. Antipathes. Animal growing in the form of a plant; 



stem expanding at the base, internally tough and horny, 

 beset with small spines ; externally covered with a 

 gelatinous bark, covered with numerous ^o/j/pe-Sear/ng' 

 tubercles. * 



7. Gorgonia. Venus's-Fax. Animal assuming a pZart<-//A:e 



form ; stem coriaceous, woody, horny or bony, com- 

 posed of stone-like fibres, striated, tapering, dilated at 

 the base; covered with a vascular or cellular bark, 

 becoming when dry spongy and friable ; the surface of 

 the stem beset with polt/pe-bearing mouths or florets. 



8. Alcyonium. Animal plant-like ; stem fixed, fleshy, 



gelatinous, spongy, or coriaceous, beset with polype- 

 bearing stellate cells. 



2. Spongia. Sponge. Animal fixed, flexile, of various forms, 

 composed of reticulated fibres, or masses of small spines 

 interwoven together, and covertd with a gelatinous 

 flesh, full of small mouths on its surface, by means of 

 which it absorbs and rejects water. 



10. Flnstra, Hornwrack. Animal a polype, proceeding 

 from porous cells ; stem fixed, foliaceous, membrana- 

 ceous, consisting of numerous rows of cells, united to- 

 gether, and interwoven like a mat. 



