226 



GLOSSARY. 



Repand, -nith a \^■aved margin. 



Replicated, folded or plaited, so as 

 to form a groove or channel. 



Reticulated, formed like a piece of 

 net-work. 



Retroflected, bent backwards. 



Retrorse, bent back. 



Retroverted, tm-ned back. 



Retuse, endins; in an obtuse sinus. 



Reversed .spire, is when the volu- 

 tions turn the reverse way of a 

 common cork screw, or to the 

 sun's ajiparent motion. 



Revolute, rolled backwards. 



Ribbed, having longitudinal, or 

 transverse ridges. 



Ridge, the upper part of a slope. 



Rima, a chink or interstice. 



Rostrum, the beak ; the extension 

 of the shell, in which the canal 

 is situated. 



Rotund, round, circular, spherical 



Rotundated, blunted, or turned, at 

 the edge. 



Rudimentaiy, small, undeveloped ; 

 generally applied to the indis- 

 tinct teeth of shells. 



Rufous, of a reddish colour. 



Rugose, rugged, full of wi-iukies. 



S. 



Sangmneous, of a blood coloui*, or 



resembling blood. 

 Scabrous, rough, rugged, harsh, oi 



hke a tile. 

 Scalloped, indented at the edges. 

 Scrobiculus, a depression or cavity. 

 Scrobiculate, i>itted, having the 



sui'face covered with hollov. s. 

 Scutellated, 7 i • 1 1 i i 

 Scuteniform,j«l^^^^^^-s^^'^P'^t^- 

 Seam, the line formed by the union 



of the valves. 

 Semi, is used in composition in the 



sense of half. 

 Semi-cordate, half heart-shaped. 

 Semi-cylindrical, half cylindrical, 



cut through lengthways. 

 Semi-oi'biculai', the shape of a half 



globe. 

 Semi-lunar, the shaxje of a half 



moon. 

 Semi-pellucid, somewhat pellucid, 



or shining. 

 Septiform, in the shape of a parti- 

 tion. 

 Serrated, like the teeth of a saw. 

 Serrulated, very minutely serrated. 

 Sessile, sitting or seated ; without 



a stalk. 

 Seta, a bristle. 



Setaceous, bristly, covered with 

 bristles. 



Setiferous, bearing bristles. 



Setose, covered with bristles. 



Smister valve, is the left valve. 



Sinus, a groove or cavity. 



Siphon, a cyUndrical tube. 



Siphunculus, a cylindrical canal 

 perforating the partitions in ])oly- 

 thalamous shells ; for instance, 

 as in the Xautilus Sjnnda. 



Solitary, generally applied to a 

 single tooth in bivalves. 



Spathulate, rounded and broad at 

 the top, and becoming narrow 

 like a spatula or battledore. 



Species, the divi.sion of a family or 

 genus, containing such as agree 

 ■x\'ith it iu generic characters ; or 

 such as are derived from one 

 common parentage. 



Spiny, thorny, covered with thorn- 

 like processes. 



Spinous, having spines lilve a 

 hedge-hog. 



Spire," all the whorls of imivalve 

 shells, excepting the one in which 

 the aperture is situated, which is 

 termed the body. 



Spiral, twisted hke a cork-screw. 



Squamose, scaly. 



Stellated, staxTed, consisting of 

 star-like figures. 



Striated, scored, or covered Mith 

 fine thread-like lines. 



Sub, in composition, means almost, 

 or approaching to ; as sub-glo- 

 bose, somewhat globular. 



Svib-arcuated, somewhat ai-ched. 



Sub-conic, somewhat conical. 



Sub-diaphonous, somewhat trans- 

 parent or clear. 



Subrotund, nearly globular. 



Subulate, awl-shaped. 



Sulcated, furrowed. 



Sulci, fm•ro^^•s or ridges. 



Summit, the tip or apex. 



Suture, a hollow line of division in 

 univalve shells, the spiral line of 

 which separates the wreaths. 



Tentacula, the feelers of snails, 

 which inhabit shells. 



Tesselated, chequered lilie a chess 

 board. 



Testacea, the third oi'der of worms, 

 including those whicli are cov- 

 ered with a testaceous shell. 



Testaceous, consisti;ig of carbonate 

 of lime and animal matter. 



