Zoological Illustrations, Second Series, Volume 1 / or, Original Figures and Descriptions of New, Rare, or Interesting Animals

by William Swainson

Truncated River Mussel.

Acephala Dimyaria.
Sub-family Les Nayades.—Lam.

Synopsis of the Genera.

Unio. Shells with lateral and cardinal teeth, the latter short and deeply divided.

Hyria. Lateral and cardinal teeth distinct; but the latter lengthened, and united to the former by irregular dentations.

Iridina. Teeth consisting of a single crenated line, parallel with the ligament.

Anodon. All the teeth either obsolete, or entirely wanting.

Alasmodon. Lateral teeth none; cardinal teeth simple, or slightly divided.

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