<eGae 
GLOSSARY 
Angular Having an angle rather than a round contour (Fig. 8p). 
Aperture The opening or ''mouth"' of a gastropod shell (Figs. 4, 6). 
Apex The tip of a gastropod shell farthest away from its 
aperture (Fig. 4). 
Axial Parallel to the axis or columella of the shell; running 
across or transverse to the direction of the whorls; the 
opposite of "spiral". 
Basal Pertaining to, situated at, or forming, the base; that 
part of a shell furthest from its apex. 
Body whorl The last whorl of a spiral gastropod shell, measured 
from the outer lip back to a point immediately above the 
outer lip (Figs. 4,6). 
Breathing pore Outside opening of the pulmonary cavity in lung breath- 
ing snails (Fig. 7). 
Broadly lunate pee Fig. Sx: 
Calcareous Composed of carbonate of lime (calcium carbonate). 
Callus A deposit of lime or shell material, often as a thickening 
near the umbilicus. 
Caudal Situated in or near the tail or posterior end, 
Columella The internal column around which the whorls revolve; 
the axis of a spiral shell (Figs. 4; 8m, n). 
Concentric From or about the same center, as inthe case of lines 
of growth in some opercula (Figs. 8ae, af). 
Contractile Capable of reducing length by shortening and thickening 
(Figs. 3a, b). 
Corneous Horn-like, 
Crenulate Scalloped or notched (Fig. 8e). 
