x GLOSSARY 
Columelia, the upright pillar in the 
centre of most Univalves. 
Compressed, in Univalves, squeezed 
together at the sides—in Bivalves 
when the valves are flattened. 
Concamerated, vaulted. 
Concentric, forming segments of a 
circle. 
Confluent, running together. 
Conoid, the shape of a shortened 
sugar loaf. 
Contracted, shortened, shrunk up. 
Convoluted, rolled upon itself like a 
piece of paper rolled between the 
finger and thumb. 
Cordate, cordiform, heart-shaped. 
Coriaceous, like leather. 
Corneous, horny. 
Coronated, girt with small knobs | 
towards the apex. 
Crenulated, minutely notched. 
Cylindrical, like a roller. 
Decollated, having the spire trun- 
cated. ; 
Decorticated, the outer coat rubbed 
off. 
Decussated, 
each other. 
Denticulated, set with small teeth. 
Depressed, pressed down horizontally 
Diaphanous, transparent. 
Digitated, having projecting claws. 
Disk, the central portion of a valve. 
Divaricated, straddling. 
Divergent, in opposite directions. 
strie which intersect 
Ears, external projections on each | 
side of the hinge. 
Effuse, spread out. 
Elliptical, oval. 
Emarginated, 
notched. 
Entire, not divided. 
Epidermis, the thin skin which 
covers the outer coat of the shell. 
Equidistant, at the same distance. 
with the margin 
Equilateral, haying both sides equal. 
OF TERMS 
Equivalve, having both valves equal. 
Eroded, corroded, as it were, gnawn 
away. 
Exserted, protruding. 
Falcated, like a scythe. 
Fasciculated, in little bunches. 
Ferruginous, rust-coloured. 
Filiform, like thread. 
Fimbriated, fringed. 
Fissure, a little slit. 
Flexuous, wavy. 
Fluviatile, inhabiting fresh water. 
Front, when the mouth of a Uni- 
valve is opposite a spectator. 
Furrow, a groove. 
Fusiform, spindle-shaped. 
Gape, an opening in Bivalyes when 
the valves are shut. 
Gibbous, bulging. 
Glabrous, smooth. 
Gilobose, globular. 
Granulated, in small grains or beads. 
Imbricated, when scales overlap each 
other. 
Inequilateral, when the hinge is 
not central, nor the sides equal._ 
Inequivalve, when one valve differs 
in size and convexity from the 
other. ; 
Incumbent, one lying over the other. 
| Incurved, bent inwards. 
Infiated, swollen. 
Inflected, bent inwards. 
Interstice, the space between one 
part and another. 
Involute, where the outer lip curves 
inwards. 
Keel, keeled, a sharp ridge. 
Laciniated, jagged. 
Lamellated, in thin plates. 
Lanceolate, like a spear head. 
Lateral teeth, the side ones. 
