electrina. Say, 42.
fallaxy Say, 32.
fuliginosa^ Griff., 37.
gularist Say, 38,
Airsuta, Say, 34.
kydrophUay Ingalls, 42.
indentata, Say, 41 1

inflecta. Say, 33.
inorncLta, Say, 37.
interna^ Say, 39.
introferens, Bid., 32.
var. minor, 32.
labyrinthica. Say, 46.
lavigata, Pfr., 37.
/(fwa. Say, 37.
lineatay Say, 48.
minusculay Binn., 43.
minuta, Say, 44.
minuHssima, Lea, 48.
monodony Rackett, 33.
palliatay Say, 30.
Pennsylvanica, Green, 27.
>«/«, De Kay, 29.
^fltytV, Binn., 27.
striatellay Anth., 45.
subplana, Binn., 38.
suppressa. Say, 38.
thyroidesy Say, 28.
tridentatay Say, 31.
Hyalina, Fer., 40.
arborea, Say, 42.
cellaria, Mttll.,41.
electrina, Gould, 42.
hydrophila, Ingalls, 42.
indentata, Say, 41.
INOPERCULATA, 18-60.
Leucocheila, Alb. and Mart., 54,
armifera. Say, 56.
contracta, Say, 56.
corticaria. Say, 57.
fallax. Say, 56.
marginata. Say, 55.
pentodon. Say, 55.
LiMACiDiE, 21.
Limax, Fer., 21.
agrestis, Linn., 22.
campestris, Binn., 23.
carolinensisy Bosc, 19.
flavus, Linn., 21.
maximus, Linn., 23.
Limnaa, Lam., 62.
caperaiusy Say, 66.
catoscopiumy Say, 64.
columellay Say, 63.
desidiosay Say, 65.
elodesy Say, 64.
humilisy Say, 65.
macrostomusy Say, 63.
reJUxusy Say, 6$.
LiMNiEIDiE, 61.
LiMNOPHILA, 60.
Limnophysa, Fitz., 64.
caperata. Say, 66.
catoscopium. Say, 64.
desidiosa, Say, 65.
elodes, Say, 64.
humilis, Say, 65.
reflexa. Say, 65.
Lioplax, Troschel, 76.
subcarinata, Say, 77.
Macrocyclis, Beck, 36.
concava. Say, 36.
Margaritana, Schum., 91.
margaritifera, Linn., 91.
marginata, Say, 93.
undulata. Say, 92,
Melaniay Lam., 83.
altilisy Lea, 83.
Melantho, Bowditch, 75.
decisa, Say, 74.
Menetus, H. B. Ad., 71.
INDEX.
113



Menetus exacutus, Say, 71.
Mesodon, Raf., 26,

albolabris. Say, 26.
bucculenta, Gould, 29.
var. rufa, Michener, 29.
clausa. Say, 28.
dentifera, Binn., 30.
Pennsylvanica, Green, 27.
palliata, Say, 30.
Sayii, Binn., 27.
thyroides, Say, 28.
MoLLUSCA, 13.
Mya complanatus, Solander, 86.
tnargariiifera^ Linn., 92.
MytUus fluvialis, Dillw., 93.
OperculatA, 74,

Pallifera, Morse, 20.
