120 . CLASS ACEPHALA. 
SoLemya, Lam. 
The ligament is seen on the outside of the shell, part of it 
remaining attached to a horizontal internal spoon-like im- 
pression on each valve. There is no other cardinal tooth, and 
a thick epidermis projects beyond the edges of the shell. 
One species (the Tellina togata, Poli IJ. xv. 20), is found 
in the Mediterranean. 
GLYCYMERIS, Lam. CYRTODARIA, Daud. 
Neither teeth, plates, nor cavities on the hinge, but a simple 
callous enlargement, behind which is an external ligament. 
The animal resembles that of the myz. 
The most common species (Mya Stliqua, L., Chemn. XI. 
193. fi. 194.) is from the Arctic Ocean. 
PANOPEA, Mesnard, Lagr. 
A stout tooth anterior to the callous enlargement of the pre- 
ceding sub-genus, and immediately under the summit, which 
crosses with a similar one of the opposite valve, a character 
that approximates the panopez to the solines. A large 
species is found in the hills at the foot of the Appenines in so 
high a state of preservation that it has been mistaken for a 
recent sea-shell. (Mya glycimeris, L.) 
Another fossil species may perhaps be separated from it, 
which is completely closed at its anterior extremity. (Panope 
de Fawas, Mesnard, Lagr., Ann. du Mus. IX. xii.) 
After all these various modifications of the myz, we may 
place the 
PANDORA, Brug., 
In which one valve is much flatter than the other; the in- 
ternal ligament is placed transversely, accompanied in front 
by a projecting tooth of the flattened valve. The posterior 
