58 NATURAL HISTORY. [UPPER FLOOR. 
(Polyphy Ilia), only when young, and by a short stem; as 
the coral enlarges, the crown separates from the stem by a 
natural absorption, and, at length, is left quite free. 
The reefs and islands, which are constantly forming in 
certain seas, especially the Pacific Ocean, are the work of 
the minute animals which inhabit these kinds of coral. 
Table Case No. 1, contains the following genera, belong¬ 
ing to the class Zoantharia:—Cyclolites, and Fungia. 
No. 2. Polyphyllia—Turbinolia—Caryophyllia — Sar- 
cinula—Catenipora—Bendrophyllia, and Lobophyllia. 
No. 3. Meandrina* and Agaricia—a portion of the latter 
are in No. 4. 
No. 4. Tridacophyllia—Monticularia—and Pavonia. 
No. 5. Astrsea, and Echinastraea. 
No. 6. Oculina—Bentipora—Astreopora, and Gemmi- 
pora. 
No. 7 and part of 8, Madrepora. 
No. 8. Palmipora— Heliopora—Alveopora — Goniopora 
— Porites — Seriatopora — Pocillopora, and Anthopora 
(Gray). 
The animals of the class Polypiaria, differ from the Sea 
Anemones, and the Zoanthi, by the mouth being provided 
with only a single series of long tentacula, by the body 
being more slender, and by the cells which they form 
being quite simple, or without any radiating laminae. 
The genera belonging to the class Polypiaria are distri¬ 
buted as follows:— 
Table Case No. 9, contains the genera, Alveolites— 
Frondipora—Lichenopora—Polytrema—Orbitolites—Mar- 
ginopora —Bistichopora —Hornera —- Jdmonea—Cricopora 
—Obelia—Tubulipora—Myriapora—Eschara—Adeone— 
Mesenteripora —Eetepora —- O vulites—Cellepora—Bereni- 
cea—Discopora—Membranipora, and Lunulites. 
No. 10. Eiectra—Flustra—Elzerina— Pherusa t—Cel- 
laria—Canda— Caberea —Tricellaria—Achamarchis—Bi- 
cellaria— Crisia — Gemicellaria — Unicellaria —Catenicella 
—Menipaea— Alecto—Anguinaria — Tibi an a — Neotneris — 
* On a Table, in front of the middle window, is a remarkably fine spe¬ 
cimen of the Meandrina cerebriformis, from Bermuda, presented by the 
late Dr. Jarvis, of Margate. 
f The Museum does not possess specimens of the genera printed in 
■italics. 
