Family: Assimineidae

Assiminea californica (Tryon, 1865)

Common name: California assiminea

Family: Pomatiopsidae

Cecinamanchurica A. Adams, 1861

Common name: Manchurian cecina

Family: Ellobiidae

Myosotella myosotis (Drauparnaud, 1801)

Common name: [salt marsh snail; no official common name]

Family: Carychiidae

Carychium occidentale Pilsbry, 1891

Common name: western thorn

Family: Valloniidae

Planogyra clappi (Pilsbry, 1898)

Common name: western flat-whorl

Vallonia pulchella (Müller, 1774)

Common name: lovely vallonia

Family: Cochlicopidae

Cochlicopa lubrica (Müller, 1774)

Common name: glossy pillar

Family: Vertiginidae

Vertigo andrusiana Pilsbry, 1899

Common name: Pacific vertigo

Vertigo columbiana (Pilsbry & Vanatta, 1900)

Common name: Columbia vertigo

Vertigo modesta (Say, 1824)

Common name: cross vertigo

Family: Truncatellinidae

Columella simplex (Gould, 1840)

Common name: [simple column; no official common name]

Family: Megomphicidae

Megomphix hemphilli (W.G. Binney, 1879)

Common name: Oregon megomphix

Family: Testacellidae

Testacella haliotidea Draparnaud, 1801

Common name: earshell slug

Family: Haplotrematidae

Ancotrema hybridum (Ancey, 1888)

Common name: Oregon lancetooth

Ancotrema sportella (Gould, 1846)

Common name: beaded lancetooth

Haplotrema vancouverense (I. Lea, 1839)

Common name: robust lancetooth

Family: Punctidae

Paralaoma servilis (Shuttleworth, 1852)

Common name: pinhead spot

Punctum randolphi (Dall, 1895)

Common name: conical spot

Family: Arionidae

Ariolimax columbianus (Gould, 1851)

Common name: Pacific bananaslug

Arion circumscriptus Johnston, 1828

Common name: brown-banded arion

Arion distinctus Mabille, 1868

Common name: darkface arion

Arion fasciatus (Nilsson, 1823)

Common name: orange-banded arion

Arion intermedius (Normand, 1852)

Common name: hedgehog arion

Arion rufus (Linnaeus, 1758)

Common name: chocolate arion

Arion subfuscus (Draparnaud, 1805)

Common name: dusky arion

Arion sylvaticus Lohmander, 1937

Common name: forest arion

Hemphillia burringtoni Pilsbry, 1948

Common name: keeled jumping-slug

Hemphillia dromedarius Branson, 1972

Common name: dromedary jumping-slug

Hemphillia glandulosa Bland & W.G. Binney, 1872

Common name: warty jumping-slug

Hemphillia malonei Pilsbry, 1917

Common name: Malone jumping-slug

Prophysaon andersoni (J.G. Cooper, 1872)

Common name: reticulate taildropper

Prophysaon coeruleum Cockerell, 1890

Common name: blue-gray taildropper

Prophysaon dubium Cockerell, 1890

Common name: papillose taildropper

Prophysaon foliolatum (Gould, 1851)

Common name: yellow-bordered taildropper

Prophysaon obscurum Cockerell, 1890

Common name: mottled taildropper

Prophysaon vanattae Pilsbry, 1948

Common name: scarletback taildropper

Zacoleus idahoensis Pilsbry, 1903

Common name: sheathed slug

Family: Succineidae

species uncertain

Common name: amber snails

Family: Gastrodontidae

Striatura pugetensis (Dall, 1895)

Common name: northwest striate

Family: Helixarionidae

Euconulus fulvus (Müller, 1774)

Common name: brown hive

Family: Vitrinidae

Pristiloma arcticum (Lehnert, 1884)

Common name: northern tightcoil

Pristiloma johnsoni (Dall, 1895)

Common name: broadwhorl tightcoil

Pristiloma lansingi (Bland, 1875)

Common name: denticulate tightcoil

Pristiloma pilsbryi Vanatta, 1899

Common name: crowned tightcoil

Pristiloma stearnsi (Bland, 1875)

Common name: striate tightcoil

Family: Zonitidae

Oxychilus alliarius (J.S. Miller, 1822)

Common name: garlic glass-snail

Oxychilus cellarius (Müller, 1774)

Common name: cellar glass-snail

Oxychilus draparnaudi (Beck, 1837)

Common name: dark-bodied glass-snail

Family: Limacidae

Lehmannia valentiana (Férussac, 1821)

Common name: threeband gardenslug

Limax maximus Linnaeus, 1758

Common name: giant gardenslug

Family: Boettgerillidae

Boettgerilla pallens Simroth, 1912}

Common name: worm slug

Family: Agriolimacidae

Deroceras laeve (Müller, 1774)

Common name: meadow slug

Deroceras panormitanum (Lessona & Pollonera, 1882)

Common name: longneck fieldslug

Deroceras reticulatum (Müller, 1774)

Common name: gray fieldslug

Family: Polygyridae

Common name: Oregon forestsnail

Cryptomastix devia (Gould, 1846)

Common name: Puget oregonian

Cryptomastix germana (Gould, 1851)

Common name: pygmy oregonian

Vespericola columbianus (I. Lea, 1838)

Common name: northwest hesperian

Family: Thysanophoridae

Microphysula cookei (Pilsbry, 1922)

Common name: Vancouver snail

Family: Helicidae

Cepaea nemoralis (Linnaeus, 1758)

Common name: grovesnail

Helix aspersa Müller, 1774

Common name: brown gardensnail

Family: Bradybaenidae

Monadenia fidelis (J.E. Gray, 1834)

Common name: Pacific sideband