Glossary. 



PAGE. 



Aperture, the mouth of the shell 12 



Bivalve, a mollusk with two shells 157 



Byssus, a bimdle of fibers 166 



Canal, a tube or chaunel 12 



Carnivorous, flesh-eating 12 



Columella, the shelly axis 12 



Coralline, a stouy sea-weed 100 



Cordate, heart-shaped 180 



Corrugated, ridged 34 



Dextral, right-hauded 48 



Epidermis, the outside skiu 20 



Fusiform, spindle-shaped 12 



Genus, a group of similar species 17 



Globose, like a globe 132 



Ligament, the elastic substance at the hinge 159 



LuNULE, a heart-shaped depression 178 



MoLLUSK, a soft-bodied animal without joints 16 



NuLLiPORE, a kind of stony vegetation 99 



Operculum, door to the aperture 14 



Peristome, rim of the aperture 37 



RETicTULATiONS,-'net-work 40 



Sinistral, left-handed 48 



Sinus, an inward curve 159 



Siphon, a breathing tube 41 



Species, a distinct type 27 



Spheroidal, somewhat like a sphere 46 



Strl^, fine parallel lines 34 



Suture, line between two whorls 13 



Tentacles, feelers 155 



Umbilicus, central opening 13 



Umbo, beak of a bivalve shell 158 



Univalve, a one,-shelled mollusk .' . . . 12 



Varix, a periodical ridge 14 



Whorl, a spiral turn 13 



223 



