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 shots, they turned my "I think it could possibly be..." into a positive i.d.

Philippines (Page 3)

Phyllidiopsis sphingis Phyllidiopsis sphingis	Phyllidiopsis striata Phyllidiopsis striata	Phyllodesmium briareum Phyllodesmium briareum
Phyllodesmium crypticum Phyllodesmium crypticum	Phyllodesmium crypticum Phyllodesmium crypticum	Phyllodesmium crypticum Phyllodesmium crypticum
Phyllodesmium jakobsenae Phyllodesmium jakobsenae	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	Platydoris ellioti Platydoris ellioti	Platydoris formosa Platydoris formosa
Platydoris formosa Platydoris formosa	Platydoris sabulosa Platydoris sabulosa	Platydoris sabulosa Platydoris sabulosa
Platydoris sanguinea Platydoris sanguinea	Platydoris sanguinea Platydoris sanguinea	Platydoris sp. 1 Platydoris sp. 1
Platydoris sp. 2 Platydoris sp. 2	Platydoris sp. 3 Platydoris sp. 3	Plocamopherus ceylonicus Plocamopherus ceylonicus
Plocamopherus ceylonicus Plocamopherus ceylonicus	Pteraeolidia ianthina Pteraeolidia ianthina	Pteraeolidia ianthina Pteraeolidia ianthina
Reticulidia halgerda Reticulidia halgerda	Risbecia sp. Risbecia sp.	Risbecia tryoni Risbecia tryoni
Risbecia tryoni Risbecia tryoni	Risbecia tryoni Risbecia tryoni	Rostanga sp. Rostanga sp.
Sakuraeolis sp. Sakuraeolis sp.	Sclerodoris tuberculata Sclerodoris tuberculata	Sclerodoris tuberculata Sclerodoris tuberculata
Sclerodoris tuberculata Sclerodoris tuberculata	Spurilla major Spurilla major	Tambja limaciformis Tambja limaciformis
Tambja limaciformis Tambja limaciformis	Taringa halgerda Taringa halgerda	Thordisa sp. Thordisa sp.
Thordisa villosa Thordisa villosa	Thordisa villosa Thordisa villosa	Thorunna australis Thorunna australis
Thorunna daniellae Thorunna daniellae	Thorunna sp. Thorunna sp.	Trapania palmula Trapania palmula
Trapania scurra Trapania scurra	Trapania vitta Trapania vitta	Tritonia sp. Tritonia sp.

Like Nudibranchs, the following are Opisthobranchs:

Aplysia parvula Aplysia parvula	Aplysia parvula Aplysia parvula	Aplysia pulmonica Aplysia pulmonica
Berthella martensi Berthella martensi	Berthellina citrina Berthellina citrina	Chelidonura amoena Chelidonura amoena
Chelidonura sp. Chelidonura sp.	Colpodaspis thompsoni Colpodaspis thompsoni	Costasiella kuroshimae Costasiella kuroshimae
Costasiella kuroshimae Costasiella kuroshimae	Cyerce sp. Cyerce sp.	Cyerce sp. Cyerce sp.
Dolabella auricularia Dolabella auricularia	Dolabrifera dolabrifera Dolabrifera dolabrifera	Elysia ornata Elysia ornata
Euselenops luniceps Euselenops luniceps	Hydatina physis Hydatina physis	Micromelo undata Micromelo undata
Notarchus indicus Notarchus indicus	Petalifera ramosa Petalifera ramosa	Philinopsis pilsbryi Philinopsis pilsbryi
Philinopsis pilsbryi Philinopsis pilsbryi	Philinopsis sp. Philinopsis sp.	Philinopsis speciosa Philinopsis speciosa
Plakobranchus ocellatus Plakobranchus ocellatus	Pleurobranchus peroni Pleurobranchus peroni	Pleurobranchus peroni Pleurobranchus peroni
Pleurobranchus weberi Pleurobranchus weberi	Polybranchia orientalis Polybranchia orientalis	Sagaminopteron ornatum Sagaminopteron ornatum
Sagaminopteron psychedelicum Sagaminopteron psychedelicum	Siphopteron brunneomarginatum Siphopteron brunneomarginatum	Stylocheilus striatus Stylocheilus striatus
Thuridilla albopustulosa Thuridilla albopustulosa	Thuridilla gracilis Thuridilla gracilis	Thuridilla hoffae Thuridilla hoffae