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.

Order: NUDIBRANCHIA

Phyllidiella pustolosa Phyllidiella pustolosa	Phyllidiella pustulosa Phyllidiella pustulosa	Phyllidiella pustulosa Phyllidiella pustulosa
Phyllidiopsis shireenae Phyllidiopsis shireenae	Phyllidiopsis sphingis Phyllidiopsis sphingis	Phyllidiopsis striata Phyllidiopsis striata
Reticulidia fungia Reticulidia fungia	Reticulidia halgerda Reticulidia halgerda	Marionia sp. 1 Marionia sp. 1
Marionia sp. 2 Marionia sp. 2	Marionia sp. 2 Marionia sp. 2	Marionia sp. 3 Marionia sp. 3
Marionia sp. 4 Marionia sp. 4	Marionia sp. 5 Marionia sp. 5	Marionia viridescens Marionia viridescens
Lemon Peel Nudibranch Tochuina tetraquetra	Festive Nudibranch Tritonia festiva	Tritonia sp. Tritonia sp.
White Dendronotid Dendronotus albus	Dendronotus diversicolor Dendronotus diversicolor	Dendronotus regius Dendronotus regius
Dendronotus regius Dendronotus regius	Dendronotus sp. Dendronotus sp.	Doto sp. Doto sp.
Notobryon wardi Notobryon wardi	Notobryon wardi Notobryon wardi	Melibe digitata Melibe digitata
Melibe digitata Melibe digitata	Melibe digitata Melibe digitata	Melibe mirifica Melibe mirifica
Melibe mirifica Melibe mirifica	Melibe mirifica Melibe mirifica	Melibe sp. 1 Melibe sp. 1
Melibe sp. 2 Melibe sp. 2	Melibe sp. 2 Melibe sp. 2	Melibe viridis Melibe viridis
California Armina Armina californica	Armina cf. semperi Armina cf. semperi	Armina sp. Armina sp.
Dermatobranchus caeruleomaculatus Dermatobranchus caeruleomaculatus	Dermatobranchus rubidus Dermatobranchus rubidus	Dermatobranchus semilunus Dermatobranchus semilunus
Frosted Nudibranch Dirona albolineata	Frosted Nudibranch Dirona albolineata	Gold Dirona Dirona pellucida
Janolus fuscus Janolus fuscus	Janolus sp. Janolus sp.	Flabellina bicolor Flabellina bicolor
Flabellina exoptata Flabellina exoptata	Spanish Shawl Flabellina iodinea	Flabellina marcusorum Flabellina marcusorum
Flabellina rubrolineata Flabellina rubrolineata	Flabellina rubrolineata Flabellina rubrolineata	Flabellina rubrolineata Flabellina rubrolineata
Three Lined Aeolid Flabellina trilineata	Flabellina verrucosa Flabellina verrucosa	Eubranchus mandapamensis Eubranchus mandapamensis
Eubranchus sp. Eubranchus sp.	Baeolidia sp. Baeolidia sp.	Cerberilla affinis Cerberilla affinis
Spurilla major Spurilla major	Cratena simba Cratena simba	Facelinid sp. Facelinid sp.
Favorinus japonicus Favorinus japonicus	Favorinus mirabilis Favorinus mirabilis	Favorinus tsuruganus Favorinus tsuruganus
Opalescent Nudibranch Hermissenda crassicornis	Opalescent Nudibranch Hermissenda crassicornis	Opalescent Nudibranch Hermissenda crassicornis
Moridilla brockii Moridilla brockii	Hilton's Aeolid Phidiana hiltoni	Phidiana indica Phidiana indica
Phyllodesmium briareum Phyllodesmium briareum	Phyllodesmium crypticum Phyllodesmium crypticum	Phyllodesmium crypticum Phyllodesmium crypticum
Phyllodesmium crypticum Phyllodesmium crypticum	Phyllodesmium jakobsenae Phyllodesmium jakobsenae	Phyllodesmium kabiranum Phyllodesmium kabiranum
Phyllodesmium koehleri Phyllodesmium koehleri	Phyllodesmium koehleri Phyllodesmium koehleri	Phyllodesmium macphersonae Phyllodesmium macphersonae
Phyllodesmium macphersonae Phyllodesmium macphersonae	Phyllodesmium magnum Phyllodesmium magnum	Phyllodesmium magnum Phyllodesmium magnum
Phyllodesmium magnum Phyllodesmium magnum	Phyllodesmium opalescens Phyllodesmium opalescens	Phyllodesmium poindimiei Phyllodesmium poindimiei
Phyllodesmium rudmani Phyllodesmium rudmani	Phyllodesmium rudmani Phyllodesmium rudmani	Phyllodesmium serratum Phyllodesmium serratum
Pteraeolidia ianthina Pteraeolidia ianthina	Pteraeolidia ianthina Pteraeolidia ianthina	Sakuraeolis sp. Sakuraeolis sp.
Cuthona lagunae Cuthona lagunae	Cuthona yamasui Cuthona yamasui	Phestilla lugubris Phestilla lugubris
Phestilla melanobrachia Phestilla melanobrachia	Phestilla melanobrachia Phestilla melanobrachia