. Contributions to Canadian biology . lanorbis bicarinatus. Say, x2. 6. Planorbis trivolvis, Say, xlh. 7. Lymnsea decoUata, Mighels, x3. 8. Lymnaea palustris, Muller, x2. 9. Amnicola limosa, Say, xl^. 10. Amnicola lustrica. Say, xlj. 11. Sphserium simile, Lamarck, xl^. • 12. Sphserium rhomboideum, Say, xl^. 13. Sphserium (Musculium) securis. Prime, x3. PLATE XI. 14. Lymnaea emarginata canadensis, Sowb, x2. 15. Lymnsea columella. Say, x3. 16. Goniobasis livescens, Menke, x2. 17. Ancylus parallelus, Hald, x3. 18. Lymnsea stagnalis sanctaemariae, Walker, x2. 19. Physa ancillaria, Say, x3^. 20. Ca

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. Contributions to Canadian biology . lanorbis bicarinatus. Say, x2. 6. Planorbis trivolvis, Say, xlh. 7. Lymnsea decoUata, Mighels, x3. 8. Lymnaea palustris, Muller, x2. 9. Amnicola limosa, Say, xl^. 10. Amnicola lustrica. Say, xlj. 11. Sphserium simile, Lamarck, xl^. • 12. Sphserium rhomboideum, Say, xl^. 13. Sphserium (Musculium) securis. Prime, x3. PLATE XI. 14. Lymnaea emarginata canadensis, Sowb, x2. 15. Lymnsea columella. Say, x3. 16. Goniobasis livescens, Menke, x2. 17. Ancylus parallelus, Hald, x3. 18. Lymnsea stagnalis sanctaemariae, Walker, x2. 19. Physa ancillaria, Say, x3^. 20. Campeloma decisum. Say, xl^. 21. Valvata tricarinata, Say, 3J. 22. Valvata sincera, Say, 3^. PLATE XII. 23. Lampsilis luteolis, Lamarck, xj. 24. Series, lamellar to pyramidal teeth in Lampsilis luteolis, Lamarck, xf. 25. Anodonta grandis. Say, xf. 26. Lampsilis luteolis, Lamarck, xf. 27. Anodontoides ferussacianus, Lea, xf. 28. Anodonta grandis, Say, x|. 29. Unio complanatus, Solander, x|. 30. Lampsilis luteolis, Lamarck, x|. Plate X.

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