Haldeman, S. S. (1841). Description of four species of Cyclas, three of which belong to the subgenus Pisidium and two species of Cypris. Proceedings of the Academy of Natural Sciences of Philadelphia. 1(4): 53 [31 August 1841, receipt date of printing bill].
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Haldeman, S. S.
1841
Description of four species of <i>Cyclas</i>, three of which belong to the subgenus <i>Pisidium</i> and two species of <i>Cypris</i>
Proceedings of the Academy of Natural Sciences of Philadelphia
1(4): 53 [31 August 1841, receipt date of printing bill]
