BULLETIN FLORIDA STATE MUSEUM


A B C


, imm D E F
FIGURE 16.-Marstonia lustrica (Pilsbry): (A-F) lake, Newaygo Co., Michigan (UF 22190); (G-J)
Cedar Swamp, Champaigne Co., Ohio (UF 22223); (K-N) Turkeyfoot Lake, Summit Co., Ohio
(UF 22225).


Vol. 21, No. 3