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

Order: CEPHALASPIDEA

Hydatina physis Hydatina physis	Micromelo undata Micromelo undata	Aglajid sp. Aglajid sp.
Chelidonura amoena Chelidonura amoena	Chelidonura hirundinina Chelidonura hirundinina	Chelidonura inornata Chelidonura inornata
Chelidonura varians Chelidonura varians	Navanax Navanax inermis	Philinopsis pilsbryi Philinopsis pilsbryi
Philinopsis pilsbryi Philinopsis pilsbryi	Siphopteron brunneomarginatum Siphopteron brunneomarginatum

Order: SACOGLOSSA

Lettuce Sea Slug Elysia crispata	Hedgpeth's Sea Hare Elysia hedgpethi	Elysia ornata Elysia ornata
Thuridilla albopustulosa Thuridilla albopustulosa	Thuridilla bayeri Thuridilla bayeri	Thuridilla hoffae Thuridilla hoffae
Plakobranchus ocellatus Plakobranchus ocellatus	Cyerce sp. Cyerce sp.	Cyerce sp. Cyerce sp.
Polybranchia orientalis Polybranchia orientalis

Order: ANASPIDEA

Aplysia parvula Aplysia parvula	Black Sea Hare Aplysia vaccaria	Dolabella auricularia Dolabella auricularia
Dolabrifera dolabrifera Dolabrifera dolabrifera	Notarchus indicus Notarchus indicus	Petalifera ramosa Petalifera ramosa
Stylocheilus striatus Stylocheilus striatus

Order: NOTASPIDEA

Berthella martensi Berthella martensi	Berthellina citrina Berthellina citrina	Euselenops luniceps Euselenops luniceps
Pleurobranchus grandis Pleurobranchus grandis	Pleurobranchus peroni Pleurobranchus peroni