1. Genus Solen. Pl. [VI].
Animal. Body cylindroid, much elongated; the mantle in form of a canal open at both ends, closed in the rest of its extent by a thick epidermis which surrounds it; a cylindroid anterior foot.
Shell. Equivalve, extremely inequilateral, the summits very small, and entirely at the commencement of the dorsal line; one or two teeth in the hinge. Inhabits the seas of America and Europe. Twenty-one species.
- Solen vaginus.
- S. corneus.
- S. pygmæus.
- S. ambiguus.
- S. Dombeii.
- S. Javanicus.
- S. Caribæus.
- S. violaceus.
- S. antiquatus.
- S. vaginoides.
- S. siliqua.
- S. cultellus.
- S. planus.
- S. constrictus.
- S. coarctatus.
- · · · · ·
- S. ensis.*
- S. minutus.*
- S. viridis.*
- S. centralis.*
- S. rostratus.*
- S. giganteus.*
2. Genus Panopæa. Pl. [VI].
Animal. Unknown.
The situation of the ligament, and the prominency of the apex, are the characters which distinguish it from the Mya.
Shell. Regular oval, elongated, gaping at both ends, equivalve, inequilateral; summit little marked and anterodorsal; hinge complete; similen formed by a conical primary tooth, before a short, compressed, ascending callosity, ligament exterior, attached to the callosity; two muscular impressions. Inhabits the Mediterranean Sea. One species.
- Panopæa Aldrovandi.