Chlamydephorus 1 Ennea 31 Aerope 5 Rhytida 3 Helicarion 3 Trochonanina 1 Trochozonites 1 Limax 1 Apera 1 Vitrina 7 Nanina 6 Conulus 2 Patula 2 Pella 44 Dorcasia 8 Phasis 1 Sculptaria 2 Helix (inc. sed.) 4 Rachis 1 Pachnodus 3 Buliminus (?) 4 Pupa 20 Vertigo 2 Achatina 18 Livinhacea 1 Stenogyra 4 Coeliaxis 1 Succinea 3 Vaginula 2 Cyclophorus 1 Cyclostoma 7 Cyclotus (?) 1 Blanfordia 1 _St. Helena._--The Molluscan fauna of St. Helena is perhaps the most puzzling, as regards its geographical affinities, of any in the world. It consists of 29 peculiar species of land Mollusca (fresh-water species being unknown), 19 of which are recently extinct, partly owing to the destruction of the forest, but are found in considerable abundance in a state of good preservation.[375] The genera are-- Hyalinia 1 Patula 4 (3 extinct) Endodonta 10 (7 extinct) Bulimulus 7 (5 extinct) Pachyotus 1 (extinct) Tomigerus (?) 1 (extinct) Pupa 2 (extinct) Succinea 3 The 5 genera which concentrate our attention are _Patula_, _Endodonta_, _Pachyotus_ (Fig. 222), _Tomigerus_, and _Bulimulus_, all of which appear utterly strange to an oceanic island in the middle of the S. Atlantic. _Patula_ and _Endodonta_ are essentially Polynesian forms, occurring abundantly on all the island groups in the Central Pacific. _Pachyotus_, _Tomigerus_ (assuming its correct identification), and _Bulimulus_ are all S. American forms, the two former being especially characteristic of Brazil. How this mixture of genera now confined to regions so widely distant, not only from St. Helena itself, but from one another, became associated here, is a problem obviously not easy of solution. The fauna is probably a remnant of a very ancient type, possibly at one time much more widely distributed. _Endodonta_ (an essentially insular form, like _Omphalotropis_) actually occurs on Fernando Noronha, off the Brazil coast, and we shall see how an Indian and even a Polynesian element is present off the eastern coasts of Africa. _Ascension I._--One indigenous species, a so-called _Limax_, is all that has ever been discovered.