Animal. Unknown.
Shell. Oval, elongated, equivalve, subequilateral, with edges nearly straight and parallel, the extremities equally rounded, and, as it were, truncated; summits but little marked; hinge without teeth, or formed by some rudimentary primary teeth, ligament projecting, affixed to thickened callosities; two distinct rounded muscular impressions.—Mediterranean Sea and coasts of America. Ten species.
- Solecurtus radiatus.
- S. strigilatus.
- S. legumen.
- · · · · ·
- S. fragilis.*
- S. costatus.*
- S. Caribæus.*
- S. lucidus.*
- S. Nuttallii.*
- S. subteres.*
- S. Californianus.*
4. Genus Glycimeris. Pl. [VI].
Animal. Unknown.
The few species of this genus yet known have been blended, by previous authors, either with the Mya or Solen, but from either they are easily distinguished.
Shell. Covered with epidermis, slightly irregular, elongated, gaping at both ends, equivalve, exceedingly inequilateral; summits little marked; hinge toothless; a longitudinal callosity. Ligament exterior, affixed to very projecting callosities on the shortest side of the shell; two distinct muscular impressions. Inhabits the North seas. Two species.
- Glycimeris margaritacea.
- G. siliqua.