Rathouisia 1 Streptaxis 7 Ennea 12 Parmarion 2 Helicarion 15 Euplecta 3 Macrochlamys 19 Microcystina 2 Microcystis 7 Kaliella 16 Sitala 8 Ariophanta 1 Rhysota 5 Hemiplecta 1 Trochomorpha 2 Limax 1 Philomycus 1 Patula 2 Gonostoma 4 Metodontia 2 Vallonia 1 Plectotropis 9 Fruticicola 11 Satsuma 14 Trichia 10 Cathaica 22 Aegista 10 Armandia 3 Acusta 15 Obbina 1 Camaena 5 Euhadra 14 Plectopylis 19 Stegodera 6 Chloritis 1 Hel. Inc. sed. 39 Buliminus 21 Buliminopsis 3 Buliminidius 3 Napaeus 14 Rachis (?) 4 Pupa 10 Clausilia 102 Opeas 12 Euspiraxis 1 Subulina 5 Stenogyra (?) 12 Succinea 8 Vaginula 7 Limnaea 2 Planorbis 6 Melania 44 Paludomus 3 Bithynia 12 Lithoglyphus 3 Melantho (?) 1 Pachydrobia 1 Prososthenia 2 Stenothyra 2 Hydrobia 2 Mecongia 1 Oncomelania 9 Margaracya 1 Rivularia 4 Delavaya 1 Fenouillia 1 Vivipara 34 Diplommatina 20 Pupina 6 Alycaeus 23 Leptopoma 2 Lagochilus 10 Cyclophorus 18 Coelopoma 1 Pterocyclus 3 Opisthoporus 4 Cyclotus 10 Scabrina 4 Ptychopoma 12 Omphalotropis 1 Realia 2 Pseudopomatias 1 Helicina 3 Georissa 4 Heudeia 1 Cyclas 1 Corbicula 50 Unio 53 Monocondylaea 1 Anodonta 55 Mycetopus 12 Pseudodon 1 Dipsas 4 The island of _Hainan_, in the extreme south of the sub-region, has 40 species of Mollusca, 22 of which are peculiar, but there is no peculiar genus. The Mollusca of _Formosa_, although in many cases specifically distinct, show close generic relationship with those of China. The characteristic Chinese groups of _Helix_ and _Clausilia_ occur, and there is still a considerable Indian element in several species of _Streptaxis_, _Macrochlamys_, _Kaliella_, and _Alycaeus_. The occurrence of two _Amphidromus_, a genus which, though Siamese, is not found in China or Hainan, is remarkable.