Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis Author Linnaeus, Carolus text 1758 Laurentius Salvius Stockholm https://archive.org/download/mobot31753000798865/mobot31753000798865.pdf book 2C6327E1-5560-4DB4-B9CA-76A0FA03D975 https://doi.org/10.5962/bhl.title.542 3922206 Helix planorbis [ spec. nov. ] H. testa subcarinata umbilicata plana: supra concava, apertura oblique ovata utrinque acuta. Fn. svec. 1306. List. angl. 145. t. 2. f. 27. - - conch. 2. t. 138. f. 42. Pet. gaz. t. 10. f. 11. Gualt. test. t. 4. f. EE. Klein. ostr. t. 1. f. 8. Habitat in Europae stagnis.