150 
NATURAL HISTORY. [NEW BUILDING. 
Fam. 5. Frondiporidce, Fam. 7* Polytremidce . Order IV. Hippo- 
Frondipora- 32 Polytrema—32 crepia. 
Alveolites—32 Fam. i. Cristatellidce. 
? Fascicularia Fam. 8. Orbitolitidce . Cristate n a 
Fam. 6. Myriaporida ?. Orbitolites—32 Plumatella—32 
Myriapora—32 Marginipora—32 Fredericella 
Circopora—32 Ovulites—32 Paludicella 
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 13.) 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 fails 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, (Ptjlota,) 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 
they assume this perfect state. These insects are di¬ 
vided into two great groups, according to the form 
of their mouth, some being provided with jaws ( [Mandi - 
bulata) for gnawing their food, w r hile others have only a 
trunk or proboscis, ( Haustellata ,) and live by suction. 
The Jaw-bearing Insects (Mandibulata, Cases 1 to 4) 
are divided into orders, according to the form and struc¬ 
ture of their wings. 
The Coleoptera 9 or Beetles, (Cases 1 to 3,) have ge¬ 
nerally two hard horny wdng-cases, or shards, united by 
a straight line, and covering two folded transparent wings, 
