Testa crassa, umbonibus distantibus intus fornicatis. Cardo planus,
masticatus dentibus numerosis minimis æqualibus transversis.
A. TORTUOSA. _A._ oblonga obliqua, valvula altera oblique carinata.
"Nates, &c." and "Cardo, &c." were the printed additions to the earlier
description. The 'Systema' synonyms of Klein (t. 8. f. 16) and Bonanni
(2. f. 128) were present in the manuscript.
A. NOÆ. _A._ oblonga angulata hians.