NOMENCLATUllE. 
31 
Stria:. See above. 
abhreviat<E, Abbreviated ; not extending to the 
margin. 
bifarm. Bifarious ; diverging. 
recurvat(Z. Recurved ; elevated, membranaceous ; 
tending towards the apex. 
inrEquilineatce. Insequilinear; not parallel. 
Sulci. See above; sometimes they are used, 
though perhaps improperly, to signify the 
same as CostcB, Ribs. 
fornicati. Arched; covered with arched scales. 
Testa. See above. 
antiquata. Antiquated ; longitudinally sulcate or 
furrowed, but interrupted by transverse 
accretions, as if lesser valves were periodi- 
cally, added to the apex or beak. 
aiirita. Eared ; the hinge produced on either 
side the beaks into a flat prominent 
angle. 
harhata. Bearded ; superficially covered with 
rigid hairs. 
compi^essa. Compressed ; the valves flattened, 
and the bosses less than usually gibbous. 
