136 
Lip, the outer edge of the aperture of 
univalves. 
Littoral, of or belonging to the shore. 
Lobated, divided at the edges into 
parts. 
Longitudinal, the length of the shell 
from the apex to the base. 
Lunated, formed like a half moon. 
Lunulated, crescent-shaped. 
Lunule, a crescent-like mark or spot, 
situated near the anterior sides in 
some bivalve shells, asin Venus, &c. 
Luniform, in the shape of a crescent. 
M 
Maculated, spotted, or patched with 
colour. 
Mammillated, applied to the apex of a 
spiral univalve, when it terminates in 
the form of a teat. 
Margaritaceous, having a pearly lustre. 
Margaritiferous, applied to pearl-bear- 
ing shells. 
Margin, the whole circumference or 
outline of the shell in bivalves. 
Marginated, having a prominent or 
tlickened margin or border. 
Membranaceous, consisting of mem- 
branes. 
Mucronate, ending in a sharp rigid 
point. 
Multilocular, many-chambered, con- 
sisting of several divisions. 
Miultivatve, shells consisting of more 
pieces than two. 
Muricated, clothed with sharp spines. 
Diuscular impressions, are marks left 
inside of bivalves, to which the ad- 
ductor muscles were attached, see 
page 8. 
N 
Nacred, pearly, pearlaceous, shining 
like mother of pearl. 
Nemoral, of or belonging to a wood. 
Nited, glossy. 
Nodose, knotty, tubercular. 
Nucleus, a kernel, a central part. 
O 
Ob, prefixed to words is used for in- 
versely or inverted; as obconic, in- 
versely conic; obcordate, inversely 
heart-shaped, 
Oblong-ovate, egg-shaped or oval. 
Obsolete, indistinct, not well defined, 
worn out. 
Ocellated, applied to eye-like spots. 
Ochreous, of the colour of yellow 
ochre. 
Olivaceous, being of a greenish olive 
colour. 
Operculum, a Jid which closes the 
GLOSSARY. 
aperture of some turbinated uni- 
valves ; and also some of the tops of 
multivalves. See page 5. 
Orbicular, spherical, circular, round. 
Order, a secondary 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. 
Oviparous, those mollusks which pro- 
duce their young in eggs. 
Ovoid, oval. 
Outer lip, the outer margin of the 
aperture in univalves, see page 4. 
P 
Pallial impression, the impression of 
the mantle in bivalves, see page 8. 
Palmated, webbed, as in the feet of 
some water birds, viz. Ducks, &c. 
Papillz, small dots or pimples. 
Papillary, ? having the surface covered 
Papillous, with dots or pimples. 
Papillose, pimpled, dotted. 
Papyraceous, thin as paper; paper-like. 
Parasitical, living on some other body. 
Parietal valves, in multivalve shells, 
are those which surround the body 
of the animal. 
Patulous, gaping, open. 
Pearlaceous, of or like mother-of-pearl. 
Partitions, calcareous processes, divid- 
ing the shells of the genera Nautilus, 
Serpula, &e. 
Pectinated, toothed like a comb. 
the support of the Pentel- 
Pedicle, asmis and its congenerous 
Peduncle, ) species, by which they are 
attached to wood, &e. 
Pediform, foot-shaped. 
Pelagic, belonging to the deep sea. 
Pellicle, the skin or film. 
Pellucid, transparent, clear, bright. 
Pentagonal, having five angles. 
Perforated, pierced with holes. 
Periostracum, the epidermis or mem- 
branaceous substance whieh covers 
the exterior of many shells. _ 
Peritreme, the whole circumference of 
the aperture of a univalve shell. 
Phosphorescent, emitting light in the 
dark. 
Pillar, in univalves is the internal con- 
tinuation of the columella, or inner 
lip, and extends from the base to 
the apex. 
Pinnated, formed like the fin of a fish. 
Pisiform, pea-shaped. 
Plaited, folded. 
Piane, flat, as in the pillag lip of the 
genus Purpura. 
Plicated, folded or plaited, as in the 
pillar of the volute tribe. 
Plunose, having afeathery appearance. 
