211 
PANOPiEA. Menard. 
Gen. Char. An equal-valved transverse bivalve ; 
sides unequally gaping ; one hinge tooth in 
each ; hinge ligament external supported by 
a thick prominent fulcrum in each valve. 
A well defined genus, formed of the Mya glycimeris of 
Linneus. Only one recent species is known ; it is a large 
heavy shell that inhabits the Mediterranean Sea. The 
thick rudely formed hinge with only one tooth in each 
valve, and that even disappearing by age, the external 
short ligament and gaping sides, are strong characters of 
the genus. There are several fossil species, but hitherto 
only one has been recorded by authors ; it is found in 
Italy along with fossils of the same, or nearly the same, 
aera as those of the London Clay. The other fossil species 
have been published in Min. Conchology under Mya 
and Lutraria, but recent examinations have shown that 
they are Panopaeae ; they are the following : 
Lutraria gibbosa, tab. 42. 
Mya intermedia, tab. 76. & 419. f. 2. 
Mya plicata, tab. 419. f. 3 . 
We are indebted to Mr. Gray of the British Museum 
for pointing out the propriety of placing the first of these 
under this genus. 
