The Conchologist's First Book / A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.

by Edgar Allan Poe; Thomas Brown

Shell. Transverse, equivalve, inequilateral; hinge with a primary tooth in each valve; cicatrices three. Four species.

• Alasmidonta undulata.
• A. ambigua.
• A. marginata.
• A. confragosa.

3. Genus Anodonta. Pl. [VIII].

Animal. As above.

Shell. Rather thin, regular, close, equivalve, inequilateral; summit anterodorsal; hinge entirely without teeth, with a postapicial lamina; ligament external, dorsal, and postapicial, two well marked muscular impressions, besides those of the retractile muscles. Inhabits fresh-water lakes in Europe and America. Forty-nine living species; and many fossil.

• Anodonta areolatus.
• A. marginata.
• A. rubens.
• A. anatina.
• A. fragilis.
• A. trapezialis.
• A. rufa.
• A. uniopsis.
• A. intermedia.
• A. glauca.
• A. anatina.
• A. sinuosa.
• A. Patagonica.
• A. cygnæa.
• A. sulcata.
• A. cataracta.
• A. exotica.
• A. crispata.
• A. Pennsylvanica.
• A. maximus.

The following species are American.

• Anodonta magnifica. Lea.
• A. Woodiana. „
• A. angulata. „
• A. Benedictensis. „
• A. cylindracea. „
• A. decora. „
• A. edentula. „
• Anodonta gigantea. Lea.
• A. incerta. „
• A. Pepiniana. „
• A. plana. „
• A. salmonia. „
• A. Stewartiana. „
• A. subcylindracea. „
• A. Ferussacina. Lea.
• A. fluviatilis. „
• A. Newtonensis. „
• A. Nuttalliana. „
• A. Oregonensis. „
• A. ovata. „
• A. pavonia. „
• A. Wahlamatensis. „
• A. Wardiana. „
• A. gibbosa. Say.
• A. grandis. „
• A. impura. „
• A. suborbiculata. „
• A. undulata. „
• A. lugubris. „

4. Genus Iridina. Pl. [VIII].

Animal. As above.