182 



GLOSSARY. 



^emi-pellucid, somewhat pellucid or 

 shining. 



Septiform, in the shape of a partition. 



Serrated, like the teeth of a saw. 



Serrulated, very minutely serrated. 



Sessile, sitting or seated. 



Seta, a bristle. 



Setaceous, bristly, covered with bris- 

 tles. 



Setiferous, bearing bristles. 



Setose, covered with bristles. 



Sinister valve, is the left valve. 



Sinus, a groove or cavity. 



Siphunculus, a cylindrical canal per- 

 forating the partitions in polythal- 

 mous shells ; for instance, as in the 

 Nautilus Spirula. 



Solitary, generally applied to a single 

 tooth in bivalves. 



Spatulate, rounded and broad at the 

 top, and becoming narrow like a 

 spatula or battledore. 



Species, the division of a family or ge- 

 nus, containing such as agree with 

 it in general characters, or such as 

 are derived from one common par- 

 entage. 



Spiny, thorny, covered with thorn- 

 like processes. 



Spinous, having spines like a hedgehog. 



Spire, all the whorls of univalve shells, 

 excepting the one in which the 

 aperture is situated, which is termed 

 the body. 



Spiral, twisted like a corkscrew. 



Squamose, scaly. 



Stellated, starred, consisting of star- 

 like figures. 



Striated, scored, or covered with fine 

 threadlike lines. 



Sub, in composition, means almost, 

 or approaching to ; as sub-globose, 

 somewhat globular. 



Sub-arcuated, somewhat arched. 



Sub-conic, somewhat conical. 



Sub-diaphanous, somewhat transparent 

 or clear. 



Sub-rotund, nearly globular. 



Subulate, awl-shaped. 



Sulcated, furrowed. 



Sulci, furrows or ridges. 



Summit, the tip or apex. 



Sature, a hollow line of division in 

 univalve shells, the spiral Hne of 

 which separates the wreaths. 



Tentacula, the feelers of snails which 

 inhabit shells. 



Tesselated, checkered like a chess- 

 board. 



Testacea, the third order of worms, 

 including those which are covered 

 with a testaceous shell. 



Testaceous, consisting of carbonate of 

 lime and animal matter. 



Tetragonal, four cornered. 



Torose, swelling into knobs or protu- 

 berances. 



Tortuosity, wreath, flexure. 



Tortuous, twisted, wreathed, winding. 



Transverse, placed across or cross- 

 ways. When the breadth of a shell 

 is greater than its length, it is called 

 transverse. 



Trapeziform, shaped like a trapezium. 



Trigonal, having three angles. 



Truncated, stunted, cut short or ab- 

 ruptly off at the end. 



Tubercle, a little knot or pimple. 



Tuberculated, knotted, pimpled. 



Tuberosities, prominent knots or ex- 

 crescences. 



Tubular, in the shape of a hollow tube. 



Tubulate, tubulous or hollow. 



Tunicated, coated. 



Turbinated, shaped like a top or pear. 



Turgid, swollen. 



U& V. 



Valve, the whole of univalve shells, of 

 shells in one piece ; and the half of 

 bivalves, or shells in two divisions, 

 &c. 



Varices, longitudinal ribs in univalve 

 shells. 



Variety, is when one species differs 

 some little degree from that of an- 

 other. 



Vaulted, like the roof of one's mouth. 



Venter, the belly, situated in the body 

 of the shell ; being the most prom- 

 inent part when the aperture is 

 turned to the observer. 



Ventral, belonging to the belly. 



Ventricose, inflated, swelled in the 

 middle. 



Vermiform, worm-shaped. 



Vertex, in the Patella the top or most 

 prominent part, situated in general 

 nearly in the middle. In the genus 

 Bulla it is used for the apex. 



Verrucose, warted. 



Verticulated, whorled. 



Umbilicated, having a depression in 

 the centre like a navel. 



Umbo, in bivalve shells, the round part 

 which turns over the liinge. 



