A new species of Planorbidae, Gyraulus (Torquis) huronensis Burch & Jung, is described from the northwestern shore of Lake Huron. Characters of the reproductive system and alimentary canal relate this planorbid snail to the Gyraulus subgenus Torquis. Gyraulus (Torquis) huronensis is distinguished from other members of the Torquis group by its habitat (the rocky wave-swept shore of Lake Huron) and by characters of its thick, mahogany red or Hay’s russet-colored shell with deflected body whorl and deep and narrow spire, its dense body pigmentation and, in the reproductive system, the prostate gland with each follicle connected directly to the sperm duct.