GLOSSARY. 
the exfoliations on the ribs of 777i- 
dacna elongata, &c. 
Free shell, one that is not attached to 
other substances. 
Free valve, the valve which is unat- 
tached, when one of them is so. 
Front, in univalyes, when the aperture 
is turned towards the observer. 
Fulcrum, in bivalves, is the tumid 
part in which the ligament is situate. 
Fureated, forked. 
Furrow, a small trench or hollow. 
Fusiform, spindle-shaped, intermediate 
between the conical and oval. 
G 
Gap, an opening in bivalves when the 
valves are shut, as in the Pholades, 
Mye, &e. 
Gaping, applied to bivalves, when 
their margins do not meet all round. 
Geminated, marked with double ele- 
vated striz, connecting the wreaths. 
Geniculate, keeled. 
Genus, an assemblage of species, pos- 
sessing certain characters in common, 
by which they are distinguished from 
all others. 
Genera, the plural of genus. 
Gibbous, bulged or swelling. 
Glabrous, smooth. 
Globose, globular, spherical. 
Granulated, beaded, in small grains or 
bead-like processes. 
Groove, a hollow channel. 
H 
Haliotoidal, ear-shaped. 
Hamiform, curved at the extremity. 
Hemispherical, in the shape of a half 
globe. 
Hirsute, rough, beset with strong hairs. 
Heteroclitical, reversed. 
Heterostrophe, reversed, applied to 
shells whose spires turn in a contrary 
direction to the usual way. 
Hispid, hairy. 
Hyaline, glassy, thin, transparent, 
1&J 
Jagged, denticulated, uneven, toothed 
like a saw. 
Imbricated, placed like the tiles of a 
house. 
Imperforated, not pierced with a hole, 
wanting an ambilicus. 
Incrassated, thickened. 
Inner lip, is placed on the right side of 
the aperture, see page 4. 
Inequilateral, when the anterior and 
posterior sides make different angles 
with the hinge; or with the sides 
dissimilar in length. 
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Inequivalve, where one valve is more 
convex or less than the other, or 
dissimilar in other respects, as in the 
common oyster. 
Inarticulate, indistinct, not properly 
formed. 
Incumbent, one lying over the other. 
pect bent inwards, crooked. 
Indented, unequally marked, hollowed. 
Inflated, tumid, swollen, blown out. 
Inflected, bent inwards. 
Inflexed, bent towards each other. 
Intereostal, placed between the ribs. 
Internode, the space between one knot 
or joint and another. 
Interrupted, divided, separated. 
Interstice, space between one part and 
another, a crevice. 
Intortion, the turning or twisting in 
any particular direction. 
Involucre, a covering. 
Involution, that part which involves 
or inwraps another. 
Involute, where the exterior lip is 
turned inwards, at the margin, as in 
the Cyprea. 
Tsabella-colour, a brownish yellow with 
a shade of brownish red. 
K 
Keel, the prominence on the back of 
the Argonauta, Ammonites, &c. 
Knob, a protuberance, any part bluntly 
elevated above the rest. 
L 
Labra, the lips. 
Laciniate, jagged, or cut into irregular 
segments. 
Lamellar, consisting of films on plates. 
Lamellated, divided into distinct plaits 
or foliations. 
Lamine, thin plates, laid one coat 
above another. 
Lanceolate, oblong, and gradually ta- 
pering like the-head of a lance. 
Lateral, extending to one side, from 
the centre, as the remote teeth in 
bivalves. When a shell is broader 
than long, it is ealled a lateral shell. 
Latticed, having longitudinal lines or 
furrows, decussated by transverse 
ones. 
Lenticular, doubly convex, of the form 
of.a lens. 
Ligament, a solid body, softer than a 
cartilage, but harder than a mem- 
bfane, which connects the valves in 
bivalves. 
Limb, the margin of bivalve shells. 
Linear, composed of straight lines. 
Linguiform, tongue-shaped. 
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