GLOSSARY, 



161 



Quadrangular, having four right 



angles. 

 Quadriplicated, having four 



plaits. 



n. 



Radiated, furnished with rays. 



Radicated, fixed by the base to 

 another body. 



Rectangular, having right an- 

 gles. 



Recur vated, 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 slope. 



Rostrum, tbe beak. 



Rugose, wrinkled. 



Sanguinaceous, divided into 



chambers. 

 Scabious, rou^h, 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. 

 Semi-orbicular, shape of a half 



globe. 

 Semi-lunar, shape of a half moon. 

 Septiform, shape of a partition. 

 Serrated, like the teeth of a saw. 

 Sessile, sitting or seated. 



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. 



T. 



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. 



IV 



