KATUHAL HISTORY SOCIETY. 



15? 



Gonium, the lower back angle of bi- 

 valve shells (Fig. 11, G). 



Granular, small grain-like markings. 



Granulose, covered with small mark- 

 ings like grains (Fig. 55). 



Gregarious, living together in flocks. 



H 



Habitat, locality where found. 

 Herbivorous, living on plants. 

 Hermaphrodite, both sexes united in 



one individual. 

 Hispid, covered with rather stiff' hairs 



(Fig. 3). 

 Hyaline, glassy. 



I 



Imbricating, over-lapping, as the shin- 

 gles of a roof. 



Impressed, marked with a plain fur- 

 row, as the suture of the spire (Fig. 

 32, H). 



Inerassated, thickened, coarse. 



Incumbent, resting against, or bent 

 against. 



Incurved, bent over. 



Indented, cut or notched. 



Inequivalve, applied to bivalves when 

 one valve is larger or bulges more 

 than the other (Fig. 1). 



Inflated, swollen, as bivalve shells 

 when the width is great. 



Inflected, turned in, as the lips of the 

 aperture 



Invaginate, the bending of one i3art 

 into another. 



Involute, one part curved around an- 

 other. 



K 



Keeled, with a ridge-like projection. 



labium, the inner lip of the aperture, 



the one next the axis (Fig. 32, J). 

 Labrum, the outer lip of the aperture 



(Fig. 32, C). 

 Lamellated, covered with scales or 



plates (Fig. 15). 

 Lamellibranchiate, having leaf-like 



gills. 

 Lamelliform, having the form of 



plates or scales. 

 Lamince, thin, leaf-like layers. 

 Lateral teeth, the elongated teeth of 



the hinge of bivalves farthest from 



the umbo (Fig. 8, D. and E). 



Lens-shape or Lenticular, applied to 

 univalves which are disk-like, but 

 curve outward al)0ut the same on 

 each side, like a double-convex 

 lens. 



Ligament, the name of the external, 

 rubber-like substance which tends 

 to open the valves of shells (Fig. 

 6, D). 



Limpet- shaped, flattened, cup-shaped 

 (Figs. 42 and 43) 



Littoral, that part of the shore be* 

 tween high and low water. 



Live shells, shells which were gathered 

 while the animal was alive ; after 

 cleaning they are alwavs called by 

 this term to indicate that they are 

 more perfect in color and parts. 



Livid, of a blackish blue color. 



Locomotive, applied to shells which 

 walk around on the surface of 

 things, instead of burrowing or re-^ 

 maining fixed. 



Lunate, of a shape nearly like that of 

 the half moon. 



Lunule, a mark or indented spot, often 

 moon-shaped, found in front of the 

 umbones of some bivalves (Fig. 6, 

 G). 



M 



Mantle, the outer, soft membrane of 

 the body of a mollusk, usually lin- 

 ing the shell and fastened to it at 

 a short distance from the outer 

 margin ; in bivalves, it is attached 

 along the pallial line. 



Marine, pertaining or belonging to 

 the sea. 



Microscopic, very tine and needing a 

 magnifying glass to be seen dis- 

 tinctly. 



Mucous, the part secreting mucus. 



Mucus, the slimy secretion of land 

 snails. 



Muricated, armed with sharp points 

 or prickles. 



IM 



Nacreous, iridescent, pearly. 



Natatory, enaliling to swim. 



Nodulous, having small knots or irreg- 

 ular prominences. 



Nucleus, the beginning of a shell ; in 

 univalves the apex, and in bivalves, 

 umbones. 



