BULLETIN FLORIDA STATE MUSEUM


In most cases the use of the term is an indication of ignorance on the part of
the user, for it does not explain the genetic basis of the observed variations.
 OPERCULUM (FIG. 25A).-The operculum is simple, ovate, corneous, very light amber-colored,
paucispiral, and consists of about 2.5 whorls. The nucleus is located in the lower right third of the
face. The surface is sculptured with a few fine incremental striations.
 FEMALE (FIGs. 5B-C).-The female reproductive system is described for the genus. Specific
characteristics are given above in the diagnosis.
 MALE (FIG. 5A).-The verge is relatively stocky. The left margin terminates with a short,
blunt apical lobe that is covered by a relatively large apocrine gland; the right margin ends in a
relatively short, stocky penis. The vas deferens is nearly straight within the verge and penis,
having very little convolution.
 TYPE LOCALITIES.-The holotype (ANSP 284061; collected by James Lewis) of Amnicola-
lustrica Pilsbry is from Little Lakes, Wayne Co., New York. The holotype (ANSP 105877; col-
lected by The Rev. Henry W. Winkley) of A. winkleyi Pilsbry is from Saco, York Co., Maine.
The holotype (ANSP 283876; collected by Frank C. Baker, 1916) of A. oneida Pilsbry is from
Lower South Bay, Oneida Lake, Madison Co., New York. The holotype (University of Illinois
Natural History Museum, P 926) of A. gelida Baker is from a post-Wisconsin deposit at Morris,
Grundy Co., Illinois. The holotype (University of Illinois Museum of Natural History Z22501) of
A. decepta Baker is from Silver Lake, Waukesha Co., Wisconsin. The holotype (University of
Illinois Museum of Natural History Z18365a) of A. perlustrica Baker is from the shore of Lake
Michigan, E of Sturgeon Bay, Door Co., Wisconsin.
 I have examined the holotypes of lustrica, winkleyi, and oneida; but not those of gelida, de-
cepta, or perlustrica.
 RANGE (FIG. 15).-Marstonia lustrica is widely distributed from Maine and
New York west through northwestern Pennsylvania, Ohio, northern Indiana,
and northern Illinois to Iowa and Minnesota. The northern limits of its known
range are in southern Quebec and Ontario. Clark (1973:245) recorded it from
the Moose, Albany, and Winnipeg river systems in Ontario. These records are
included on my distribution map, though I have not examined the specimens.
Two southern records, one each from Missouri and Virginia, need to be con-
firmed with new material.
 SPECIMENS EXAMINED.-ILLINOIS. COOK Co.: Chicago, Lake Michigan (MCZ 2221); Berry
Lake, nr. Chicago (CM 62.24230); DEKALB Co.: DeKalb (MCZ 46577); FULTON Co.: Canton
(FMNH 19976, UMMZ 69847); LAKE Co.: Highland Park, beach at Lake Michigan (USNM
523790); MASON Co.: (FMNH 9851); Illinois River above Havana (FMNH 15687); MCHENRY
Co.: Algonquin, Fox River (FMNH 71860); ROCK ISLAND Co.: Rock Island (USNM 476863); WILL
Co.: Joliet (FMNH 58692); Joliet, DuPage Crossing (FMNH 65031); Joliet, Lillycache Creek
(CM). INDIANA. KOSCIUSKO Co.: Turkey Lake (UMMZ 120595, FMNH 87888); LAKE Co.:
Berry (FMNH 112724); Lake Michigan, Millers (CM); Millers, Calumet River (UMMZ 120605);
LA PORTE Co.: Pine Lake (UMMZ 69846, UMMZ 120618, MCZ 167502); MARSHALL CO.:
Maxinkuckee Lake (CM, UMMZ 69045, FMNH 87850, USNM 541981, MCZ 71291); PORTER
Co.: Tremont Dunes Park, beach drift (FMNH 157441); Indiana Dunes State Park (FMNH
114682); STEUBEN Co.: Pleasant Lake (USNM 346866, UMMZ 27572); Turkey Lake (CM). IOWA.
DICKINSON Co.: Canal, Upper Gar Lake (USNM 508447); Lake Okoboii (USNM, 30 lots); Or-
leans (USNM 478427); Spirit Lake (USNM 514552, FMNH 130405); Arnold's Park (UF 22218-
22221); MUSCATINE Co.: (USNM 510611); ScoTTr Co.: Davenport, Mississippi River (USNM
528018). MAINE. YORK Co.: Saco (ANSP 105877). MICHIGAN. ALLEGAN Co.: Green Lake
(UMMZ 120657, USNM 508421); BARRY Co.: Long Lake, 1 mi. NE Cloverdale (UMMZ 197694,
USNM 622765); BERRIEN Co.: Niles (CM); BENZIE Co.: Crystal Lake (UMMZ 120656); BRANCH
Co.: St. Joseph River, Union City (UMMZ 197695, USNM 622754); Marble Lake, nr. Quincy
(UMMZ 164280); CALHOUN Co.: Ackley Lake, 9 mi. N Marshall (UMMZ 197709); 7.5 mi. S Battle
Creek, Graham Lake (USNM 622764); Battle Creek River, 4.5 mi. NE Battle Creek (UMMZ
197692); Outlet of Hall's Lake, 2.5 mi. E Battle Creek (UMMZ 197711); Battle Creek, Bailey
Park, Battle Creek River (UMMZ 171790); CHARLEVOIX Co.: Deer Lake (UMMZ 29586); Barney


Vol. 21, No. 3