V.

[ l s ]

PLATE

FIG. I.monoculus conchaceus.

Aptera.Without wings.Generic Character.

Body

covered with a crust or {hell.

F eet made for swimming.

Specific Character.

^ ' n a bivalve, afh-coloured shell, from the aperture of

It: P uts f°rth a number of capillary antennae, which it retradts” h “ -ken o Mo f, hemter .

To

sect ' . C< ^ Ulre a P ro per knowledge' of the formation of this minute in-or rath S neCe ^ ar y t0 use a microscope with a glass stage for objects,quire- 6r aS a ^ rn ' t of nicely adjusting a talc as occasion may re-and 6 ' t0 taken from the water with a camel-hair pencil,

tefully placed on the talc ; after which it may be examined by a

magnifier of i r ■ 1

l et ^ 1 to- ot an inch focus; but in proceeding to a deeper power,

the fl • ta ^ C ^ turned the upper surface with the insect in the drop of

to its 1 ^ r0m *^ e ^ ens ’ und thereby the lens may approach the object

imm ^ r °f er focus ; without this caution the lens would be frequently* i “inero-ed ir*

ne and entirely obstruct the fight.

verin ”s^ ate ’ fo e opacity of the bivalve shell, its external co-tbe fila ° entare ty obscures the internal motion, that nothing, exceptmi crofcop ntS ^ t ^ r ° WS foom the aperture or opening, is visible by the

parent t ^ le C SS perfectly formed, but very minute and tranf-

from / - 1S 1S focrefore the best time to discover its structure, and

from

0sle ist this state we have taken our figure