376 The Molluscan Family Planorbidae 



PLATE 70 



Animals of Planorbidae 



1. Hclisoma campanidatum (Say). Canadian specimen. View as seen crawling up side 



of aquarium jar. 



2. Helisoma scalare (Jay). March 13. Twelve hours out of egg. 



3. Helisoma scalare (Jay). Lake Butler, Florida. Adult with shell 10 mm. long. Drawn 



from aquarium specimen. 



4. Tropicorbis havanensis (Pfeiffer). New Orleans, Louisiana. Drawn from aquarium 



specimen. Shows pigmentation of mantle through shell. 



5. Gyraulus hirsutiis (Gould). Halfmoon Pond, near Alton Bay, Lake Winnipesau- 



kee. New Hampshire. Head and tentacles of crawling animal. 



6. Helisoma trivolvis (Sa.y). Oneida Lake, New York. Young Animal. 



7. Hclisoma trivolvis macrostomum (Whiteaves). Near Bayfield, Wisconsin. Side 



view of crawling animal with parts indicated. 



8. Hclisoma trivolvis jallax (Haldeman). Cambridge, Massachusetts. Animal crawl- 



ing up side of aquarium jar. 



9. Menetus dilatatus (Gould). Unionville, Connecticut. Animal crawling on stick in 



aquarium jar. Side view. 



10. Menetus dilatatus (Gould). Unionville, Connecticut. Top view of animal. 



11. Planorbula jeriksii (H. F. Carpenter). From pool near Lake Wentworth, New 



Hampshire. Animal crawling on bottom of aquarium jar. 



12. Helisoma subcrcuatum (P. P. Carpenter). Buccal sac with parts indicated. 



13. Gyraulus albus (Miiller). Buccal .sac. The outline of the radula is shown in the 



radular sac and the buccal sac. 



Lme near figure indicates 1 mm. in length 



