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adhering affinities animals aperture appearance arrange attached base belongs bivalve shells bosses byssus called canal cardinal teeth central Cephalopoda chambers channel characters chiefly Chitons close composed Conchology conical connected convex cover deep notch dilated distinct distinguished divided divisions entire external five flat flattened follow fossil four fresh water gaping genera genus groove groups hinge hole inhabited inner lip inside internal irregular known lateral lateral teeth lengthened less ligament Limpet lines live lower margin minute Mollusca mouth muscle muscular impressions naked narrow natural nearly never notch numerous opening operculum Orbicular Outer lip Oval perforated pillar placed plaits plate pointed polished resembling rocks round septa shaped short side slightly smooth sometimes species spiral spiral shells spire straight strong substance syphon Testacia thick thickened thin tooth transverse tribe true turned univalve upper usually valve whorls wide
Page 3 - As our present business, however, is with the shells, and not with the animals, we shall chiefly confine our remarks to the
Page 11 - channel long; no plaits, but the tip of the spire enlarged. Fossil only.
Page 3 - Conchology, as a science, must be founded both upon the structure of the soft parts of the animal,