126 GLASS XIII. O^DER II. 



Sec. A. Inhabiting tubes, like the pith of a vege- 

 table caulis ; open at the summit or side. 



TUBJPORA, (pipe-coral,) coral consisting of erect 

 iiollow cylindric parallel aggregate tubes. 



TUBULARIA, (coral-tube,) stem tubular, simple 

 or branched, fixed by the base j animal projecting 

 from the end of the tube, and having its head 

 crested with tentacula. 



SERTULARIA, (sea-moss, coral-grass,) animal 

 growing in the form of a plant ; stem branched, 

 producing polypes from cup form denticles or mi- 

 nute cells. 



Sec. B. Each polypus occupies a cell., separated 

 from the cells of other polypi by their partitions ; 

 and they communicate with each other by very 

 minute pores. 



CELLULARIA, (outer-celled coral,) cells dispos- 

 ed in a manner to form branching stems, but with- 

 out a communicating tube along the axis 5 calca- 

 reous. 



FLUSTRA, (sea-mat, horn- wrack,) animal a po- 

 lypus proceeding from porous cells ; stem fixed; 

 foliaceous, membranaceous, consisting of numer- 

 ous ro\vs of cells, united together and woven like 

 a mat. 



CEJLLEPORA, (inner-celled coral,) presents a 

 mass of little cells, or calcareous vesicules, dis- 

 tributed opposite to each other, pierced with a 

 small hole. 



CORALLINA, (coralline,) animal growing in the 

 form of a plant ; stem fixed, with calcareous sub- 

 divided branches, mostly jointed, 



