160 
Lenticulate, doubly convex. 
Ligament, a solid body which 
connects the valves in bi- 
valves. 
Linear, composed of lines. 
Linguiformed, tongue-shaped. 
Lip, the outer edge of the aper- 
ture of univalves. 
Lobated, rounded at the edges. 
Longitudinal, the length of the 
shell. 
Lunated, formed like a half 
moon. 
Lunule, crescent-like. 
Luniform, shape of a crescent. 
M. 
Margin, the whole circumfe- 
rence or outline of the 
shell in bivalves. 
Marginated, having a promi- 
nent margin or border. 
Membrane, a web of fibres. 
Mouth, see Aperture. 
Muscular impressions, marks 
made by the animal in ad- 
hering to the shell. 
Mottled, clouded or spotted. 
Mucronate, ending in a sharp 
point. 
Multilocular, many chambered. 
Muricated, clothed with sharp 
spines. 
‘ N. 
Nacred, pearly. . 
Nemoral, belonging to a wood. 
Nited, glossy. 
Nodose, knotty. 
Nucleus, a kernel. 
O. 
Obsolete, obliterated. 
Oblong, oval. 
Ocellated, eye-like spots. 
Ochreous, colour of yellow ochre. 
CONCHOLOGY. 
Offuscated, darkened, clouded. 
Olivaceous, of a greenish olive 
colour. 
Operculum, which closes the 
aperture of the shell. 
Orbicular, circular, round. 
Orifice, an opening or perfora- 
tion. 
Ovate, shaped like an egg. 
Ovoid, oval. 
P: 
Papillose, pimple, dotted. 
Papyraceous, thin as paper. 
Patulous, with a gap or opening. 
Partitions, processes dividing 
the shells of the Nautilus, 
Serpula, &c. 
Pectinated, resembling the teeth 
of a comb. 
Pedicle, the support of the Ana- 
tifera and its corresponding 
species, j 
Peduncle, a tube on which any 
thing is seated. 
Pellucid, transparent, 
bright. 
Pentagonal, having five sides. 
Perforated, pierced with holes. 
Pervious, admitting passage. 
Pillar, in univalves the internal 
continuation of the colu- 
mella or inner lips, extend- 
ing from the dase to the 
apex. 
Pinnated, winged. 
Plaited, folded. 
Plaits, folds. 
Plicated, folded or plaited. 
Posterior, see Margin. 
Produced, lengthened out. 
Protrude, to thrust forward. 
Punctuated, like the punctures 
of a thimble. 
Pyriform, pear-shaped. 
clear, 
