36 ZOOLOGY. 
A common species from the Indian Ocean and Red Sea. In this genus the: 
corallum is formed by a single polyp, which covers it beneath as well as 
above. The tentacles are scattered, and when touched, are withdrawn 
between the lamelle. 
Tribe 2. Caryophyllacea. 
Tentacles numerous, in two series; coralla calcareous, cells multiradiate, 
interstitial surface not lamello-striate. The fourth family is not coralligenous. 
fam. 1. Cyathophyllide. Interior middle of each corallum usually 
transversely or obliquely cellular. 
fram. 2. Caryophylliide. ‘Tentacles crowded and long, mouths far 
exserted ; interior of the corallum not transversely cellular, rays of the cells 
more than twelve. Oculina virginea, Linn. (pl. 75, fig. 58). White, — 
eighteen inches high, East and West Indies and the Mediterranean. (0. 
gemmascens (pl. 'T5, jig. 59). White, eight inches high. 
fam. 3. Gemmiporide. Tentacles short and marginal, in two or three 
series; disk broad, somewhat convex; coralla porous, calicles with a thick 
margin. ¢ Hxplanaria ananas (pl. 75, Jig. 68). 
Fam. 4. Zoanthide. Exterior subcoriaceous, tentacles short and 
marginal, in two or three series. | 7 
Tribe 3. Madreporacea. 
Tentacles in a single series, seldom more than twelve, sometimes obsolete ; 
coralla calcareous, cells small, six- to twelve-rayed, or obsolete ; interstitial 
surface not lamello-striate. 
fam. 1. Madreporide. Tentacles twelve; cells deep, extending to the 
centre of the corallum. MJadrepora ee (pl. 75, jig. 60). 
fam. 2. Havositide. Tentacles twelve; lime ued periodically at 
base, so that the interior of the corallum is oe rarely solid. Ona 
polymorpha (pl. 15, fig. 55). (Lamarck, 2, 311.) Red Sea. 
Fam. 8. Ponnae Tentacles rarely more than twelve; base forming 
porous calcareous secretions beneath; coralla finely porous, cells shallow, 
rays indistinct. Porites porites, Linn. (P. clavarva, Blainv.) (pl. 75, 
jig. 61). American and Indian seas. 
Tribe 4. Antipathacea. 
Animals six-tentaculate, base forming corneous secretions. 
fam. 1. Antipathidw. Animals fleshy, enveloping a corneous spinulous 
axis. Antupathes spiralis (pl. 75, fig. 51); stem entire, long, and spiral, 
about as thick as a quill, and attaining a length of sixteen feet. Indian 
Ocean. | 
SUB-ORDER 2. ALCYONARIA. 
Eight-tentaculate; tentacles papillose, apex of the papille perforate ; 
often coralligenous. 
Tribe 1. Alcyonacea. 
Fam. 1. Pennatulide. Free, or with the base sunk in the mud. 
Pennatula phosphorea, Linn. (pl. 75, jig. 26). Bears some resemblance 
to a quill. It is found in the European seas, and emits a pale-blue 
phosphorescent light when disturbed. P. granulosa, Lam. (jig. 25), and. 
240 | 
