330 The Molluscan Family Planorbidae 



PLATE 47 



Kidneys of Planorbidae 



1. Gyraulus parvus (Say). Winnebago Lake, Wisconsin. 



2. Gyraulus circumstriatus (Tryon). Wainwright Park, Alhoifa. 



3. Gyraulus deflcctus ohliquus (DeKay). Near Quebec, Canada. 



4. Gyraulus vermicularis (Gould). Near San Francisco, California. 



5. Gyraulus parvus (Say). Section near middle. Line equals 0.5 mm. 



6. Gyraulus circumstriatus (Tryon). Section near middle. Line equals 0.5 nmi. 



7. Gyraulus vermicularis (Gould). Section near middle. Line equals 0.5 nun. 



8. Gyraulus convexiusculus (Hutton). India. Section near middle. 



9. Gyraulus siniilarls (F. C. Baker). Section near middle. 



10. Gyraulus deflcctus obliquus (DeKay). Section near middle. 

 IL Gyraulus latestornus F. C. Baker. Section below middle. 



Figures 6 to 11 have same magnification as fig. 5. 



12. Anisus vortex (Linn.). Near Wansaw, Poland. 



13. Ayiisus spirorbis (Linn.). Near Warsaw, Poland. 



14. Ayiisus vortex (Linn.). Section near middle. Line equals 0.5. mm. 



15. Anisus leucoslomus (Millet). Section near middle. Line equals 0.5 mm. 



16. Anisus spirorbis (Linn.). Section near middle. Line equals 0.5 mm. 



17. Gyraulus convexiusculus (Hutton). India. 



18. Gyraulus hirsutus (Gould). Canada. 



19. Gyraulus hirsutus (Gould). Section below middle. 



20. Armiger crista (Linn.). Wi.sconsin. 



21. Anniger crista (Linn.). Section near middle. Line equals 0.5 nnu. 



22. Segmenlina nilida (Miiller). Near Warsaw, Pohmd. 



23. Segmentina nitida (Miiller). Section below middle. Line equals 0.5 nun. 



24. Polypylis hemisphaerula (Benson). Peiping, China. 



25. Polypylis hemisphaerula (Benson). Section near middle. Line equals 0.5 mm. 



26. Intha capitis Annandale. South Shan State, Burma. 



27. Intha capitis Annandale. Section below middle. Line equals 0.25 mm. 



Linless otherwi.se stated the line near the figure indicates 1 nun. ni length. 



