BIVALVES.— ANOMIA. 65 
ANOMIA.— Anomi4 or ANTIQUE LAMP. 
DESCRIPTION OF PLATE XV. 
Dv. I,—Fig. 6. A. ephippium. Dy. Il.—Fig. 2. A. caput-serpentis. 
Fig. 5. Variety of do. Fig. 3. A. psittacea. 
Fig. 7. Plug of fig. 6. by which Fig. 4. A. rosea. 
the shell attaches itself to 
other substances. Dw. III.—Fig. 1. A. placenta. 
Shell bivalve, inequivalve, one of the valves flattish, the other gib- 
bous at the base, with a produced beak, generally curved over the 
hinge; one of the valves often perforated near the base: hinge 
witha linear, prominent cicatrix, and alateral tooth placed with- 
in, but in the flat valve, and on the extremity of the margin: two 
bony rays for the base of the animal. 
OF this singular genus of Bivalves, there are thirty spe- 
cies, many of which are extremely rare and valuable. 
The Anomiz differ materially in form: some re- 
semble the shape of an Oyster, as the A. cepa, A. ephip- 
pium, &e. all of which have the lower vaive flat and 
perforated ; others, again, are imperforated, and nearly 
orbicular, as the A. placenta, &c.; and some are obiong, 
as the A. bifida, &c. Many species, particularly the 
A. caput-serpentis, when seen in profile, resemble the 
form of an antique lamp; and a few, as the A. psitta- 
cea, &c, are very similar to the hooked or curved beak of 
a parrot. 
The shells are usually inequivalve, one of them often 
flattish, and the other gibbous at the base, terminating 
in a produced beak, which curves upwards over the 
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