ROOM IV.] NATURAL HISTORY. 
77 
Cliona—31 
Order II. Cornea. 
Fam. 1 . Vesiculariad <£. 
Vesicularia 
Serialaria—31 
Pedicellaria—31 
Valkeria 
Bowerbankia 
Lusia 
Dedalea 
Obelia—31 
Discopora—31 
Idmonea—31 
Hornera—31 
Fam. 3. Celleporida. 
Cellepora—31 
Hippothoa—31 
Lepralia—31 
M embranipora—31 
Ord. III. Calcarea. Fam - 4 - Escharida;. 
Fam. 1. Crissiadce. 
Eucratea 
Crissia—31 
Tibiana 
Tricellaria 
Notamia 
Anguinaria 
Fam. 2. Tubuliporida. 
Tubulipora—31 
Flustra—31 
Electra—31 
Cellularia—31 
Lunulites—31 
Sabrina—31 
Acamarchis—31 
Farcimia—31 
Retipora—32 
Adeone—32 
Eschara—32 
Fam. 5. Frondiporidce. 
Frondipora—32 
Alveolites—32 
Fam. 6. Myriaporidce. 
Myriapora—32 
Circopora—32 
Fam. 7* PolytremidcB. 
Polytrema—32 
Fam. 8 . Orbitolitidce. 
Orbitolites—32 
Marginipora—32 
Ovulites—32 
Order IV. Hippo* 
crepia. 
Fam. 1. Cristatellidce . 
Cristatella 
Plumatella—32 
THE FOURTH ROOM 
Contains a selection of Annulose Animals to illustrate 
their arrangement; the General Collection being kept in ca¬ 
binets in a private room for study. (See page 12.) These 
animals are called annulose , or ringed, because they are 
covered with a hard skin, which is divided by transverse 
contractions into rings, which enables the body to move in 
every direction. This skin falls off as the animal in¬ 
creases in size, a new soft one being formed beneath it; 
which hardens on exposure to the air. The outward form 
is often greatly altered each time they change their skin, 
until they arrive at their full size. They are furnished 
with three or more pairs of jointed legs for locomotion, 
and sometimes with wings for flight; but these organs are 
often only exhibited when the animal is in a perfect state 
of developement. 
The winged annulose animals, (Ptilota,) Cases 1 to 10, 
to which the name of Insects is most generally confined; 
in their last and perfect state they have only three pairs of 
true legs, and in most instances two pairs of wings. They 
generally undergo a great change in appearance before 
