180 



GLOSSARY. 



Involute, where the exterior lip is 



turned inward at the margin, as in 



the Cyprsa. 

 Isabella-colour, a brownish yellow 



with a shade of brownish red. 

 Juncture, the joining of the whorl in 



univalve shells. 



K. 



Keel, the longitudinal prominence in 

 the Argonauta. 



Knob, a protuberance, any part blunt- 

 ly arising above the rest. 



Labra, the lips. 



Laciniate, jagged or cut into irregular 



segments. 

 Lacunose, having the surface covered 



with pits. 

 Lamellar, consisting of films on plates. 



Lamellated, divided into distinct plaits 

 or foliations. 



Laininffi, thin plates, laid one coat 

 above another. 



Lanceolate, oblong, and gradually ta- 

 pering like the head of a lance. 



Lateral, extending to one side from 

 the centre. 



Latticed, having longitudinal lines or 

 furrows, decussate by transverse 

 ones. 



Lenticulate, doubly convex, of the 

 form of a lens. 



Ligament, a solid body, softer than a 

 cartilage, but harder than a mem- 

 brane, which connects the valves in 

 bivalves. 



Limb, the margin of bivalve shells. 



Linear, composed of lines. 



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, the length of the shell 

 from the apex to the base. 



Lubricity, slippcriness, smoothness of 

 surface. 



Lunated, formed like a half moon. 



Lunulated, crescent-shaped. 



Lunule, a crescent-like mark or spot, 

 situated near the anterior and pos- 

 terior slopes in bivalve shells. 



Luniform, in the shape of a crescent. 



M. 

 Margin, the whole circumference or 

 outline of the shell in bivalves. 



Marginated, having a prominent mar- 

 gin or border. 



Membrane, a web of several sorts of 

 fibres. 



Membranaceous, consisting of mem- 

 branes. 



Mottled, clouded or spotted with vari- 

 ous colours. 



Mucronate, ending in a sharp rigid 

 point. 



Multilocular, many-chambered, con- 

 sisting of several divisions. 



Muricated, clothed with sharp spines. 



N. 

 Nacred, pearly, pearlaceous. 

 Nemoral, of or belonging to a wood. 

 Nited, glossy. 

 Nodose, knotty. 

 Nucleus, a kernel. 



O. 



Ob, prefixed to words, is used for in- 

 versely or inverted ; as ohconic, in- 

 versely conic ; obcordate, inversely 

 heart-shaped. 



Oblong-ovate, egg-shaped or oval. 



Obsolete, indistinct, not well defined. 



Ocellated, applied to eyelike spots. 



Ochreous, of the colour of yellow 

 ochre. 



Olfuscated, darkened, clouded, dim- 

 med. 



Olivaceous, being of a greenish olive 

 colour. 



Operculum, a lid which closes the 

 aperture of some turbinated uni- 

 valves ; and also some of the tops 

 of multivalves. 



Orbicular, spherical, circular, round. 



Order, the second division of the ani- 

 mal kingdom. Orders are made up 

 of a plurality of genera. 



Orifice, an opening or perforation. 



Ovate, shaped like the longitudinal 

 section of an egg. 



Ovoid, oval. 



P. 



Palmated, webbed, as in the feet of 



some water-birds. 

 Papilte, small dots or pimples. 

 Papillary, > having the surface cover- 

 Papillous, 5 ed with dots or pimples. 

 Papillose, pimpled, dotted. 

 Papyraceous, thin as paper. 

 Parasitical, living on some other body. 

 Patulous, with a gap or opening. 

 Pearlaceous, of or like mother-of' 



pearl. 



