ANODON crassus,
Thick Anodon, or Horse Mussel.
Generic Character.—See Pl. 96.
Specific Character.
A. testâ ovatâ, latâ, crassa; margine cardinali subarcuato, extremitate utrâque angulatâ alatâ; umbonibus prominentibus, apicibus retusis.
Shell oval, broad, thick; hinge margin subarcuated, the extremities winged and angulated; umbones prominent, the tips retuse.
It is only recently that travellers have directed their attention to the less attractive shells of distant regions; and our cabinets now begin to be enriched by the numerous land and fresh-water species of those countries. Among these new acquisitions, the fresh-water bivalves appear the most extraordinary in their formation, and the most numerous in species. Of the Anodons, it may be doubted whether the great Linnæus was acquainted with more than three or four species; Lamarck enumerates fifteen, but a much greater number have passed under my own examination.