CLASS XIII, ORDER It. 127 
Sec. C. The polyyi are united in the form of a 
dense bark, around an axis, variable 1m form 
and in texture. 
ANTIPATHOs, (sea-fan,) animal growing in the 
form of a plant; stem expanded at the base, in- 
ternally borny and beset with small spines, ex- 
ternally covered with a gelatinous flesh, beset 
with numerous polypi bearing tubercles. 
GorGonta, (gorgon,) animals growing in the 
form of a plant ; stem coriaceous, corky, woody, 
horny or bony, composed of glassy fibres, or like 
stone, striate, tapering, dilated at the base, cov- 
ered with a vascular or cellular flesh, or bark, 
and becoming spongy and friable when dry ; 
mouths or florets covering the surface of the stem, 
and polypi-bearing. 
Isis, (bush-coral,) animal growing much in the 
form of a plant ; stem stony, jointed, the joints 
longitudinally striate, united by spongy or horny 
junctures, and covered by a soft porous cellular 
flesh, or bark ; mouths beset with oviparous po- 
lypes. 
Sec. D. Having the stony ov coriaceous covering 
branched, rounded, or in plates; always fur- 
nished with stellated lanine. In the living 
state, the stony part is entirely covered with a 
living membrane, which is soft and gelatinous, 
bristled with tentacula, which are the polypi. 
Mavrepora, (star-coral,madrepore,) animal re- 
sembling a medusa 5 coral with lamellate star- 
form cavities. 
PENNATULA, (sea-feather, sea-pen,) animal not 
affixed, of various shapes, supported by a bony 
