I owe a huge debt of gratitude to Dave Behrens and Terry Gosliner for their incredibly helpful assistance in identifying my nudibranch photos. For the vast majority of my photos, they turned my "I think it could possibly be..." into a positive i.d.

Puget Sound

California Armina Armina californica

San Benito Islands

Three Lined Aeolid Coryphella trilineata

Felimare californiensis Felimare californiensis

Porter's Chromodorid Felimare porterae

Solomon Islands

Ardeadoris cruenta Ardeadoris cruenta	Asteronotus cespitosus Asteronotus cespitosus	Caloria indica Caloria indica
Chromodoris lochi Chromodoris lochi	Chromodoris lochi Chromodoris lochi	Gymnodoris ceylonica Gymnodoris ceylonica
Hypselodoris melanesica Hypselodoris melanesica	Miamira sinuata Miamira sinuata	Moridilla brockii Moridilla brockii
Nembrotha kubaryana Nembrotha kubaryana	Nembrotha purpureolineolata Nembrotha purpureolineolata	Nembrotha sp. 3 Nembrotha sp. 3
Notodoris serenae Notodoris serenae	Phyllidia carlsonhoffi Phyllidia carlsonhoffi	Phyllidia elegans Phyllidia elegans
Phyllidia exquisita Phyllidia exquisita	Phyllidiella pustolosa Phyllidiella pustolosa	Phyllidiopsis shireenae Phyllidiopsis shireenae
Roboastra gracilis Roboastra gracilis	Tambja morosa Tambja morosa	Thecacera picta Thecacera picta
Tyrannodoris luteolineata Tyrannodoris luteolineata

Like Nudibranchs, the following are Opisthobranchs:

Chelidonura varians Chelidonura varians

Pleurobranchus grandis Pleurobranchus grandis

St. Vincent

Lettuce Sea Slug Elysia crispata

Vancouver Island

Hudson's Dorid Acanthodoris hudsoni	Nanaimo Dorid Acanthodoris nanaimoensis	Acanthodoris pilosa Acanthodoris pilosa
Antiopella fusca Antiopella fusca	Yellow Edged Cadlina Cadlina luteomarginata	Coryphella verrucosa Coryphella verrucosa
White Dendronotid Dendronotus albus	Dendronotus diversicolor Dendronotus diversicolor	Dendronotus venustus Dendronotus venustus
Diaphorodoris lirulatocauda Diaphorodoris lirulatocauda	San Diego Dorid Diaulula sandiegensis	Frosted Nudibranch Dirona albolineata
Frosted Nudibranch Dirona albolineata	Gold Dirona Dirona pellucida	Monterey Dorid Doris montereyensis
Monterey Dorid Doris montereyensis	Opalescent Nudibranch Hermissenda crassicornis	Opalescent Nudibranch Hermissenda crassicornis
Cockerell's Dorid Limacia cockerelli	Palio dubia Palio dubia	Three Colored Polycera Polycera tricolor
Lemon Peel Nudibranch Tochuina gigantea	Clown Nudibranch Triopha modesta	Festive Nudibranch Tritonia festiva

Like Nudibranchs, the following is an Opisthobranch:

Hedgpeth's Sea Hare Elysia hedgpethi