« Testa globoso-conoidea, imperforata, transversim striata, albida seu virescente, purpureo seu fusco radiata; anfractibus convexiusculis, ultimo subaugulato, basi convexo; apertura ex rhombeo-orbiculari, margaritacea; columella obliqua, simplici, tereti. – I have received the illustrated specimen from Mr. Sylvanus Hanley as a variety of the previous one (Tr. umbilicatus Penn.), But I cannot decide to consider it a mere variety, but must declare it a separate species. »