GLOSSARY. 



159 



Filiform, thread- shaped, slender. 



Fimbriated, fringed. 



Fissure, a cleft or slit. 



Flexuous, zigzag, with angles 

 widening. 



Flexure, a bending. 



Fluviatile, belonging to fresh 

 water. 



Foliaceous, lamina or leave- 

 shaped. 



Fragile, brittle, easily broken. 



Front, the aperture next the 

 observer. 



Furcated, forked. 



Furrow, a trench or hollow. 



Fuscated, darkened, obscured. 



Fusiform, spindle-shaped, coni- 

 cal, or oval. 



G. 



Gaping, when the valves do not 

 close. 



Geniculate, keeled. 



Genus, characters by which 

 they are distinguished from 

 others. 



Genera, plural of genus. 



Gibbous, bulged. 



Glabrous, having a smooth sur- 

 face. 



Globose, globular, round. 



H. 



Hemispherical, in the shape of 



a half globe. 

 Heterostrophe, shells whose 



spires reverse. 

 Hispid, hairy. 

 Hinge, the part where the 



valves are united, 



I& J. 



Jagged, denticulated, uneven. 

 Imbricate, covered with scales. 

 Imperforate, having no umbili- 

 cus. 



Inequilateral, when the anterior 

 and posterior parts of the 

 shell are dissimilar. 



Inequivalve, when the valves 

 are dissimilar. 



Inarticulate, indistinct. 



Incumbent, one lying over the 

 other. 



Incurved, bent backward. 



Indented, unequally marked. 



Inflated, tumid, swollen. 



Inflected, bent inward. 



Inflexed, bent towards each 

 other. 



Intercostal, placed between the 

 ribs. 



Interrupted, divided, separated. 



Interstice, space between. 



Intortion, turning or twisting. 



Involute, without a spire. 



Involution, that part which in- 

 volves another. 



Juncture, the joining of the 

 whorl in univalves. 



K. 



Keel, the longitudinal promi- 

 nence in the Argonauta. 

 Keeled, see Carinated. 



L. 



Labra, the lips. 



Laciniate, cut in irregular seg- 

 ments. 



Lacunose, surface covered with 

 pits. 



Lamellar, films on plates. 



Lamellated, divided into distinct 

 plaits or foliations. 



Laminae, thin plates, laid one 

 above another. 



Lanceolate, oblong, tapering 

 like the head of a lance. 



Lateral, extending to one side 

 from the centre. 



Latticed, see Decussated. 



