Testa univalvis, patens, convexa. Spira obsoleta, lateralis. Foramina
lateralia pervia.
H. MIDÆ. _H._ subrotunda, utrinque nitida.
_Humana_ was the intended specific appellation.
H. TUBERCULATA. _H._ subovata, rugis transversis tuberculatis.
The reference to Lister was an emendation.
H. STRIATA. _H._ ovata, transversim rugosa, longitudinaliter striata.
No name was attached to either this or any member of the genus, except
the first.
H. VARIA. _H._ ovata, striis longitudinalibus, majoribus tuberculatis.
H. MARMORATA. _H._ ovata, striis longitudinalibus, transversis
obsoletis.
H. ASININA. _H._ oblonga, extra foramina angulata, striis elevatis.
H. PARVA. _H._ ovata, angulo inter foramina et spiram.
All the headings in this genus are similar to those in the 'Systema'.