Glossary. 



PAGE. 



Aperture, the mouth of the shell 12 



Bivalve, a mollusk with two shells 157 



Byssus, a bundle of fibers 166 



Canal, a tube or chauuel 12 



Carnivorous, flesh-eating 12 



Columella, the shelly axis 12 



Coraeeine, a stony sea- weed 100 



Cordate, heart-shaped 180 



Corrugated, ridged 34 



Dextrae, right-handed 48 



Epidermis, the outside skin 20 



Fusiform, spindle-shaped 12 



Genus, a group of similar species 17 



Geobose, like a globe 132 



Ligament, the elastic substance at the hinge . 159 



LunulE, a heart-shaped depression 178 



Moeeusk, a soft-bodied animal without joints 16 



NuEEiPORE, a kind of stony vegetation 99 



Operculum, door to the aperture 14 



Peristome, rim of the aperture 37 



RetictueaTions, 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 



Stride, 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 



