390 POLYPI. 
light-brown longitudinally streaked with whitish; its form is 
usually elongated and frequently narrowest below; skin smooth; 
tentacula numerous. When it contracts, long filaments arising 
from the ovaries are frequently protruded through the mouth. 
It usually fixes itself on shells, and is extremely common in the 
Mediterranean(1). - 
The Tuatassiantua, Ruppel, are Actiniz with ramified ten- 
tacula(2). ; 
The Discosoma, Rupp., are Actinize in which the tentacula are 
almost reduced to nothing by their shortness(3). 
ZoanTuus, Cuv. 
The same fleshy tissue and arrangement of the mouth and tenta- 
cula as in the Actiniz, and a nearly similar organization; but these 
animals are united in more or less considerable number on a com- 
mon base, sometimes in the form of a creeping stem(4), and some- 
times having a broad surface(5). 
Lucernaria, Mull. 
The Lucernariz should apparently be approximated to the Acti- 
niz, but their substance is softer; they fix themselves to fuci and 
other marine bodies by a slender pedicle, and their superior por- 
tion dilates like a parasol, in the centre of which is the mouth. Nu- 
the characters established by observers, and still less to the approximations pro- 
posed by compilers. 
(1) Add of nearly certain species, Hydra cereus, Gm.; Gert., Phil. Trans. 
LI, i, 1; Encyc., LX XIII, 1, 2;—Aydra bellis, Phil. Trans. Ib., 2; Encyc. Ib. 4;— 
Hydra helianthus, Ellis, Phil. Trans., LVEL, xix, 6, 7; Encyc., LXXI, 1, 2;—Hydra 
aster, Ellis., Phil. Trans., LVU, xix, 3; Encyc. LXXI, 3;—Actinia varians, Zool. 
Dan., CXX1X;—Aet. candida, 1b., CXV;—Act. plumosa, tb., LXXXVUI;—Act. 
coccinea, Ib., LXIII, 1, 3;—Act. viridis, Forsk., XX VII, B; Act. rubra, Brug.; Forsk., 
Ib., A;—.4ct. maculata, Brug.; Forsk., Ib., C;—Actinia quadricolor, Ruppel, Voy., 
Moll, pl. i, f. 3, &e. P 
(2) Thal. aster, Ruppel, Moll., pl. i, f. 2. 
(3) Dise. nummiforme, Tdsab:,, 4. 1. 
(4) Hydra sociata, Gm.; Ell. and Sol., Corall., I, i; Encyc., LXX, 1. 
(5) Aleyonitum mammillosum, Ell. and Sol., loc. cit., 4;—Alc. digitatum, Id. Ib:, 6. 
These last form the genus PatytHor of Lamouroux, and lead to the Alcyoniz. - 
This genus appears to have been characterized from desiccated specimens. See 
the great work on Egypt, Zool., Polyp., pl. ii, f. 1—4. 
