P. chinensis. P. conica latior lævis, labio interno laterali.
This was an addition to the original catalogue.
P. porcellana. P. basi interne labiata, pone mucronato-subspiralis.
P. crepidula was not mentioned in the manuscript.
P. saccharina. P. margine sinuato, carinata, costis 7.
"Pet, Amb. t. 3. f. 3", and "Klein 117. t. 8. f. 4", were additional synonyms: both are in the 'Systema.'
P. barbara. P. dentata, costis 19 elevatis.
P. granularis. P. margine dentato, striis elevatis mucronibus imbricatis.
The erroneous reference to Gualtieri was not in the original.
P. granatina. P. margine angulato, striis 11 lævibus.