USED IN CONCHOLOGY. 
Length, the distance in Bivalves 
from the hinge to the opposite 
margin—in Univalves, from the 
apex to the extreme base. 
Lenticular, double convex, asa lens. 
Ligament, the leathery substance 
which connects the valves. 
Linear, narrow, the length much 
exceeding the breadth. 
Lineated, marked with lines. 
Lip, in Univalves, the outer edge of 
the mouth—in Bivalves, the edge 
of the valves. 
Longitudinal, lengthways. 
Lunated, crescent-shaped. 
Lunule, the posterior depression near 
the beak. 
Mammuillated, like a breast. 
Marginated, having a prominent 
border. 
Mucronate, ending in a sharp, rigid 
point. 
Multilocular, many chambered. 
Muricated, rough with spines. 
Muscular scar, the marks made by 
the muscles by which the animal 
adheres to the shell. 
Nacreous, pearly. 
Nodose, knotty. 
Obsolete, indistinct. 
Operculum, the lid which closes the 
mouth of certain Univalves, also 
the top valves of Multivalves. 
Orbicular, spherical. 
Ovate, egg-shaped. 
Papillary, having the apex rounded. 
Papyraceous, thin as paper. 
Patulous, gaping. 
Pedicle, the fleshy support of certain 
cyrrhipedes. 
Pillar, the internai continuation of 
the columella. 
Plumose, feather- like. 
x1 
Posterior side, the side to which the 
beaks of Bivalves incline. 
Produced, lengthened out. 
Pyriform, pearl-shaped. 
Quadrangular, with fourright angles. 
Radiated, furnished with rays. 
Rectangular, having right angles. 
Recurved, bowed back. 
Refiected, bent back, 
Reniform, kidney-shaped. 
Repand, with a serpentine margin. 
Reticulated, like network. 
Retuse, ending in an obtuse sinus. 
Reversed spire, coiling in the oppo- 
site direction to the usual one. 
Ridge, the upper part of a slope. 
Scabrous, rugged. 
Scalloped, indented at the edges. 
Scutellated, Scutelliform, shield- 
shaped. 
Semi, used in composition in the 
sense of half. 
Serrated, like the teeth of a saw. 
Sessile, fixed by its base. 
Setaceous, bristly. 
Sinus, a hollow. 
Slope, the depressed space on each 
side of the beak in Bivalves. 
Spatulate, rounded, and broad at the 
top, and becoming narrow like a 
spatula, or battledore. 
Spire, all the whorls of Univalves, 
except the body one. 
Spiral, coiled like a corkscrew. 
Stellated, of a star-like figure. 
Striated, covered with fine thread- 
like lines, either raised or below 
the general surface. 
Sub, in composition, means rather. 
Syphon, or siphunculus, a tube run- 
ning through the partitions of 
chambered shells. 
Subulate, tapering, awl-shaped. 
Sulcated, grooved. 
Sulci, ridges or grooves. 
