GLOSSARY. 
Quadrangular, having four right 
angles. 
Quadriplicated, 
plaits. 
having four 
Radiated, furnished with rays. 
Radicated, fixed by the base to 
another body. 
Rectangular, having right an- 
gles. 
Recurvated, turned backward. 
_ Recurved, bowed back. 
Reflected, bent backward. 
Refracted, abruptly bent. 
Reniform, kidney-shaped. 
Replicated, folded or plaited. 
Reticulated, formed like a piece 
of net-work. 
Retuse, ending in an obtuse 
sinus. 
Reversed spire, see Heterostro- 
phe. 
Revolute, rolled backward. 
Ribbed, having longitudinal ribs. 
Ridge, the upper part of a sJope. 
Rostrum, the beak. 
Rugose, wrinkled. 
S. 
Sanguinaceous, divided into 
chainbers. 
Scabious, rough, rugged. 
Scalloped, indented at the edges. 
Scuttelated, shield-shaped. 
Seam, line formed by the union 
of the valves. 
Semi, the half. 
Semi-cordate, half heart-shaped. 
Senfi-orbicular, shape of a half 
globe. 
Semi-lunar, shape ofa half moon. 
Septiform, shape of a partition. 
Serrated, like the teeth of a saw. 
Sessile, sitting or seated. 
161 
Seta, a bristle. 
Setaceous, covered with bristles. 
Setiferous, bearing bristles. 
Sinister valve, is the left valve. 
Sinus, a groove or cavity. 
Siphunculus, a cylindrical per- 
foration as in the Nautilus, 
Spirula, &c. 
Spatulate, rounded and broad at 
the top. 
Species, the division of a family 
or genus. 
Spiny, thorny. 
Spinous, like a hedgehog. 
Spire, all the whorls in univalves 
except the one in which the 
aperture is situated, which 
is termed the body. 
Spiral, twisted like a corkscrew. 
Squamose, scaly. 
Striated, covered with thread- 
like lines. 
Sub, almost. 
Subarcuated, somewhat arched. 
Subconic, somewhat conical. 
Subulate, awl-shaped. 
Sulcated, furrowed. 
Summit, the tip or apex. 
Suture, a hollow line of division 
in univalves, the spiral line 
of which separates the 
wreaths, 
i ys 
Teeth, pointed protuberances 
within the hinge in bi- 
valves by which the valves 
are united. 
Tentacula, the feelers of snails, 
which inhabit shells. 
Tessalated, checquered like a 
chess board. 
Testacea, that order of animals 
covered with a testaceous 
shell. 
14* 
