88 NATURAL HISTORY. [EAST. ZOOL. 
have supposed them to be internal shells ; but this cannot 
be the case with all, as many are attached by their outer 
surface to sea-weeds and shells. From their being formed 
of numerous chambers, they have been generally asso¬ 
ciated with the Nautili , but they differ essentially from the 
latter in their construction, which consists of a number of 
cells piled one on the other; and in having no terminal 
cavity for the reception of the body of the animal. 
The cells are furnished with one or more small mouths, 
and placed one on another in different directions, some 
forming straight lines, as Nodosaria, and others spiral 
ones, as Rotalia. In others the cells are half the length 
of a whorl, so that each new ceil changes the situation of 
the mouth from one to the other end of the shell, as in 
the Miliolce : and in others the cells are divided into nu¬ 
merous longitudinal tubes, as in Alveolina and Fabularia . 
These animals have been generally arranged with the 
Nautili , and some have classed them with the Cephalo- 
podous Mollusca , w ? hile others have thought they might be 
formed by animals allied to the Annelides. One author 
has proposed that they should be formed into a class, 
which he proposes to call Rhizopodes ; but it is not im¬ 
probable, when they shall have been more completely 
examined, that they will be found to be allied to the 
Polyzoa ; and the body, which has been called their shell, 
may prove to be only a hardened skin, like the cells 
formed by that class of animals. 
EASTERN ZOOLOGICAL GALLERY. 
The Wall Cases contain the Collection of Birds ; but 
only part of them can at present be exhibited, until the 
other Cases, now in progress, are ready for their reception. 
The British specimens are distinguished by a B. on the end 
of the perch. 
Birds may be characterized as warm-blooded vertebrated 
animals, which are covered with feathers and are ovi¬ 
parous. They are divided into orders and families by 
the form of their limbs and beaks, as the modifications 
of these parts most prominently exhibit their habits. 
I. The first section contains the Raptorial and Passerine 
birds which generally build on trees or on high places, and 
have their young hatched blind and nearly naked, so that 
