ARCA. ARK. 
9 
(finally as hardly to be visible with the highest magnifying 
powers: beaks not quite central, prominent, pointed, close 
together; teeth in a curved line, three or four on each 
side; inside glossy, with the margin thin and very entire : 
diameter the eighth of an inch. 
Specimens or this minute Area were first presented to 
us by the Rev. Dr. Goodull, who we believe obtained them 
from the Devonshire coast. They seem to differ from the 
very young of A. pilosa, in their transparency, total want 
of colored markings, in the circumference not being circu¬ 
lar, and in not having the slightest appearance of teeth or 
crenatures on the margin, v. in. 
6. Area Nocc. Noah's Ark. Fig. 58. 
Lister, pi. 368. f. 208— Donovan , pi. 15S. f. 1, 2. 
Shell oblong, inclining to rhombic, rounded at one end,. 
elongated, narrower, and somewhat angular at the other, 
the smaller end of each valve turning in to meet the other, 
forming a sharp angle and a gape at the margin, regularly 
and strongly ribbed longitudinally, and crossed with fine 
transverse lines giving it a punctured appearance, and 
sometimes marked with a few concentric ridges: beaks 
nearer to one end, much separated by a deep rhombic space 
which is smooth: color pale rufous-brown, with deeper 
chesnut bands crossing the valves diagonally; inside whit¬ 
ish or tinged with brown; the teeth placed in a straight 
line: length about half an inch ; breadth rather more. 
Sandy shores of Devon and Cornwall, Dunbar, and Leith 
roads in Scotland, and Dublin bay: rare. v. m. 
7. Area perforans. Perforating Ark. 
Lister, pi. 235. f. 69. * 
Area lactea. Pennant, pi. 61. f. 2— Da Costa, pi. 11. 
f. 5— Donovan, pi. 135— Dorset Cat. pi. 11. f. 5. 
Shell thin, convex, rhombic oval, generally rounded at 
one end and more or less angular at the other, but varying 
much in its depth and figure, with numerous close-set re¬ 
gular raised longitudinal lines, which are finely beaded by 
minute transverse strise, and marked with deeper trans¬ 
verse ridges; covered when fresh with a dark-brown silky 
skin which fringes the margin, under which it is of a,rusty- 
brown 
