TY  - JOUR
A1  - Watson, H.
JO  - Proceedings of the Malacological Society of London
C1  - 14 (1): 6-30, pl. 1-2. London [2 May].
TI  - The affinities of <i>Pyramidula, Patulastra, Acanthinula</i>, and <i>Vallonia</i>
UR  - https://www.biodiversitylibrary.org/page/30346737
PY  - 1920
Y2  - 2026-05-19
ER  -