224 



GLOSSARY. 



Imbricated, placed like the tiles of 



a house. 

 Imperforated, not pierced with a 



hole, wanting an umbilicus. 

 Inequilateral, when the anterior 



and posterior sides make difter- 



ent angles with the hinge. 

 Inequivalve, where one valve is 



more convex than the other, or 



dissimilar in other respects, as 



in the common oyster. 

 Inarticulate, not jointed. 

 Incumbent, one lying over the 



other. 

 Incurved, jbent inwards, crook- 

 Incurvated, $ ed. 

 Indented, unequally marked, hol- 

 lowed. 

 Inflated, tumid, swollen, as if blown 



out. 

 Inflected, or inflexed, bent inwards. 

 Intercostal, placed between the 



ribs. 

 Internode, the space between one 



knot or joint and another. 

 Interrupted, divided, separated. 

 Interstice, space between one part 



and another, a crevice. 

 Intortion, the turning or tvdsting 



in any particular direction. 

 Involucre, a covering. 

 Involution,that part which involves 



or inwraps another. 

 Involute, where the exterior lip is 



turned inwards, at the margin, 



as in tlie Cypraja. 

 Isabella-colour, a brownish-yellow 



with a shade of brownisli-red. 

 Juncture, the joining of the whorls 



in univalve shells. 



Keel, the longitudinal prominence 



in the Argonauta. 

 Knob, a protuberance, any part 



bluntly arising above the rest. 



Labra, the lips. 



Laciniate, jagged or cut into irre- 

 gular segments. 



Lacunose, having the surface cov- 

 ered with pits. 



Lamellar, consisting of films or 

 plates. 



Lamellated, divided into distinct 

 plates or foliations. 



Laminae, thin plates, laid one coat 

 above another. 



N. 



Nacred, pearly, perlaceous. 

 Nemoral, of or belonging to a woo<i. 

 Nitid, glossy. 



Lanceolate, oblong, and gradually 

 tapering like the head of a lance. 



Lateral, placed at the side, or ex- . 

 tending to one side, from the 1 

 centre. I 



Latticed, having longitudinal lines 

 or furrows, decussated by trans- 

 verse lines. 



Lenticulate, doubly convex, of the 

 form of a lens. 



Ligament, a solid body, softer than 

 a cartilage, but harder than a 

 membrane, which connects the 

 valves in bivalves. 



Limb, the disk of bivalve shells. 



Linear, composed of lines, or slen- 

 der like a line. 



Lineate, marked with lines. 



Lip, the outer edge of the aperture 

 of univalves. 



Littoral, of or belonging to the 

 shore. 



Lobated, rounded at the edges. 



Longitudinal, in the direction of 

 the length of the shell from the 

 apex to the base. 



Lubricity, sUpperiness, smoothness 

 of surface. 



Lunated, formed like a half moon. 



Luniform, in the shape of a cres- 

 cent. 



Lunulated, crescent-shaped. 



Lunule, a crescent-like mark or 

 spot, situated near the anterior 

 and posterior slopes in bivalve 

 shells. 



M. 



Margin, the whole circumference 



or outUne of the shell in bivalves. 

 Marginated, having a prominent 



margin or border. 

 Membrane, a thin filmy body. 

 Membranaceous, consisting of 



membranes. 

 Mottled, clouded or spotted with 



various coloiu-s. 

 Muci'onate, ending in a shai-p rigid 



point. 

 Multilocular, many-chambered, 



consisting of several di^•isions. 

 Muricated, clothed with sharp 



spines. 



