Limpet 
Lip 
Lirae 
Lirate 
Lunate 
Malleate 
Mantle 
Mouth 
Mucus 
Multispiral 
Narrowly oval 
Narrowly 
ovate-lunate 
Nucleus 
Oblong 
Opaque 
Operculate 
Operculum 
Outer lip 
BEG oe 
A gastropod with a low, conical, unspiraled (or nearly 
so) shell, 
Edge of the aperture; also called peristome (Figs. 4; 
Sd se,eh. hy i). 
Raised lines or ridges running in the same direction as 
the whorls (Fig. 6b). 
Bearing raised spiral lines or ridges (Fig. 6b). 
Shaped like a half-moon (Figs. 8u, v, w, xX, y). 
Dented as if hit with a hammer. 
A membraneous flap or outer covering of the softer 
parts of a mollusk; it secretes the shell. 
The opening or aperture of a gastropod shell. 
A viscid, slippery secretion; slime. 
Having many spirals or whorls (Fig. 8ac). 
see Pig. St. 
See Fig. 8w. 
The first part or beginning of a shell or operculum, that 
is, the nuclear whorls or protoconch in snail shells 
(Figs. 4; 8ad, ae). 
Longer in one direction than in another, with sides more 
or less parallel. 
Not transparent or translucent. 
Bearing an operculum or cover to close the aperture 
(Fig. 2). 
A horny or calcareous plate that serves the purpose of 
closing the aperture when the snail withdraws into its 
shell (Figs. 2; 8ac, ad, ae, af). 
The outer edge of the aperture (Fig. 4). 
