508 CLASS ECHINODERMATA. 
ANTIPATHES, Lin. Vulgo. Black coral, 
Have the substance of their axis branched, and of a ligneous 
appearance, enveloped in a bark so soft, that it is destroyed 
after death. Accordingly, in cabinets they resemble branches 
of dry wood. (Ant. spiralis, Sol. et Ell.) 
Goreonl,, L., 
Have, on the contrary, this ligneous or corneous substance of 
their axis, enveloped in a bark, the flesh of which is so pene- 
trated with calcareous grains, that it dries up on the axis, and 
often preserves its colours in a state of great beauty and viva- 
city. It is dissoluble in acids. The polypi of several species 
have been observed. They have each eight denticulated arms, 
a stomach, &c. like those of the coral, and the alcyone. (Gor- 
gonia pinnata, Gm., &c.) 
M. Lamouroux distinguishes from these, 
PLEXAURUS, 
Whose thick bark, with cellules not projecting, makes but 
little effervescence in acids. (G. Crassa, Gm., &c.) 
EUNICEA, 
Whose bark, organised like that of Plexaurus, has projecting 
nipples, from which its polypi issue forth. (Gorgonia antt- 
pathes, Seba, &c.) 
MURICEA, 
Whose bark, moderately thick, has projecting nipples, co- 
vered with imbricated and bristling scales. (M. spicifera, 
Lam.) 
PRIMNOA, 
Whose elongated nipples are imbricated, hanging one upon 
the other. (Gorg. Reseda, Gm., &c.) 
