crenated

Unio fragilis is principally distinguished by the cardinal teeth: those in the right valves are 2; short, obtuse, and nearly obsolete, more resembling tubercles, than the crenated or striated teeth of this genus.

Shell smooth, thick in the middle, brown, with a narrow whitish band; spire striated, the stri� with internal punctures: outer lip crenated; pillar 5 plaited.

Shell white, with capillary green bands; spire elongated, sub-attenuated, of six convex volutions; outer lip crenated; base slightly truncate.

Twice crenated, as in the case of leaves whose crenatures are themselves crenate.

The blood was fluid, of the color and appearance of port-wine lees; under the microscope the corpuscles were shrivelled and crenated, and there was a space apparent between them as they were arranged in rouleaux.