324 The Molluscan Family Planorbidae 



PLATE 44 



Kidney of Helisoma 



1. H. anceps (Menke). Gillespies Pond, Collinsville, Connecticut. 



2. H. trivolvis (Say). Oneida Lake, New York. 



3. H. corpulcntum (Say). Lake of the Woods, Ontario, Canada. 



4. H. scalare (Jay). Lake Butler, Florida. 



5. H. duryi normale Pilsbry. Canal at Boj-nton, Florida. 



Sections of kidneys 



6. H. oregonense (Tryon). Tooele Co., Oregon. Near lower end of kidney. 



7. H. anceps (Menke). Gillespies Pond. Collinsville, Connecticut. Above middle. 



8. H. a. latchfordi (Pilsbry). Meach Lake, Quebec, Canada. Near middle. 



9. H. trivolvis (Say). Oneida Lake, New York. About middle. 



10. H. t. macrostomum (Whiteaves). Bayfield, Wisconsin. About middle. 

 IL H. t. lentum (Say). New Orleans, Louisiana. Lower end. 



12. H. pilsbryi (F. C. Baker). Lake Chetek, Wisconsin. Near Middle. 



13. H. truncatum (Miles). Winnebago Lake, Wisconsin. Near middle. 



14. //. magnificum (Pilsbry). Near Wilmington, North Carolina. Near middle. 



15. H. corpulentuyn (Say). Lake of the Woods, Ontario. Near middle. 



16. H. c. multicostntum F. C. Baker. Crooked Pine Lake, Ontario. Lower end. 



17. H. p. infracarinatum F. C. Baker. Basswood River Rapids, Ontario. At middle. 



18. H. occidentale (Cooper). Klamath Lake, Oregon. Near middle. 



19. H. o. depressum F. C. Baker. Klamath Lake, Oregon. Near middle. 



20. //. (raskii (Lea). Buena Vista Canal, California. Near middle. 



21. H. subcrenatnm (P.. P. Carpenter). McMurray, Skagit Co., Washington. Near 



middle. 



22. H. plexatum (Inger.soll). Columbine Lake, Colorado. Lower end. 



23. H. horni (Tryon). Paul Lake, British Columbia. Near middle. 



24. H. tenue calij orniense F. C. Baker. Shandon, California. Near middle. 



25. H. scalare (Jay). Lake Butler, Florida. Near middle. 



26. H . duryi normale Pilsbry. Canal at Boynton, Florida. Near middle. 



Line near figure indicates 1 mm. in length. Arrow indicates 

 point at which section was made. 



