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The Window Pane Oyster
The windowpane oysters
(Placenta placenta) is large, strongly laterally compressed and often thin and translucent.
The young shell is attached by a byssus, but the adult is unattached, without any trace of the
byssus or byssus cleft.
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Nautilus
The pearly nautilus is the only existing
form belonging to the group Tetrabranchiata. Nautilus possesses four gills, and a beautiful,
large, spirally coiled shell, pretty ornamented externally with wavy colour markings and with
an exquisite pearly lustre within. The shell is divided into numerous chambers by means of a
series of septa or walls, which are pierced by a hole in the centre through which a process
passes in the living state of the animal. Specimens of an entire shell of nautilus pompilus
and a section of the shell to show the chambers and the septa are exhibited.
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Model of House Fly
The house fly is an
example of the order Diptera. This order includes forms with two transparent membranous wings
behind which are a pair of small, club-shaped organs known as "halters" or
"balancers" which are the modified hind wings. There is no distinct prothorax. The
parts of the mouth are adapted for piercing or sucking. The metamorphosis is complete. The
larvae are usually footless grubs or maggots with the head retracted and the pupae are either
exposed with the limbs free or enclosed in a scaly case. Most of the Diptera are fairly small
and dull coloured. Many are parasitic and many others are scavengers. Some are aquatic.
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