426 GLASS XIII. ORDER Il. 
Sec. A. Inhabiting tubes, like the pith of a vege- 
table caulis ; open at the summit or side. 
Tusirora, (pipe-coral,) coral consisting of erect 
hollow cylindric parallel aggregate tubes. 
Tusucanria, (coral-tube,) stem tubular, simple 
or branched, fixed by the base ; animal projecting 
from the end of the tube, and having its head 
crested with tentacula. | 
SeRTULARIA, (sca-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 coal ,) cells dispos- 
ed in a manner to form branching stems, but with- 
out a communicating tube along the axis; calca- 
reous.. 
Frustra, (sea-mat, horn-wrack,) animal.a po- 
lypus proceeding from porous cells; stem fixed, 
foliaceous, membranaceous, consisting of numer- 
ous rows of cells, united together and woven like 
a mat. 
 CeLLepora, (inner-celled coral,) presents a 
mass of little cells, or calcareous vesicules, dis- 
tributed opposite to each other, pierced with a 
small hole. 
Cora.uina, (coralline,) animal growing in the 
form of a plant ; stem fixed, with calcareous sub- 
divided branches, mostly jointed. 
