The purpose of this publication is to list the land Mollusca (snails and slugs) of the northern portion of the Lower Peninsula of Michigan (NLPM) and to give their known distribution. The area under consideration comprises the three northern-most counties of the Lower Peninsula, i.e., Emmet, Cheboygan and Presque Isle counties. This is an area of nearly 2,200 square miles, bordered on the west by Lake Michigan, on the north and east by the Straits of Mackinac and Lake Huron, and on the south by Charlevoix, Otsego, Montmorency and Alpena counties. The climax vegetation of the area consists mainly of Northern Hardwoods, Pine, and Conifer Bog and Swamp communities. For land snails, the first, the Northern Hardwoods Community, is of particular significance. These communities provide mesic conditions and nutrient-adequate habitats. In Pine communities, the soil is sandy, often dry, acid and poor in nutrients, all unfavorable circumstances for land snails. Conifer Bog and Swamp communities are generally considered poor habitats for land snails, due to the conifers and bog shrubs, the high water tables, and the acid and calcium-poor conditions. However, in this area, some snails occur in such habitats, and a few species thrive there.