TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 111 
Out of the 139 species collected by the writer, 108 are peculiar to the group. 
They are all embraced in 25 genera, 7 of which are operculated. The excessive 
preponderance of indigenous species in the archipelago clearly demonstrates its claims 
to a special land-shell fauna. 
With the exception of the species of Melampus and Partula hyalina, all the land 
shells which are common to other groups are invariably small species. Mycrocystis 
conula and M. Discordie are common to the Cook’s, and the latter also occurs in the 
Marquesas Islands. Jf. caleulosa is found in the latter group and the Viti Islands. 
Stenogyra Tuckeri and Vertigo pediculus are diffused throughout Polynesia. Vertigo 
tantilla inhabits the Cook’s, Samoa and Viti Islands, Tornatellina aperta occurs in the 
Marquesas. 7. Philippii extends its range to the Austral, Cook’s and Marquesas, 7’ 
conica, oblonga and nitida live on all the south Polynesian groups; and 7. serrata, 
together with oblonga, also occur in the Kingsmill and Caroline Islands. 7. perpleau 
inhabits all the southeastern groups. Partula hyalina is common to the Austral and 
Mangaia, one of the Cook’s Islands. Patula modicella ranges from the Paumotu to 
the Ellice’s group. Limax Raratonganus inhabits the Cook’s and probably the 
Gambier Is. Chondrella parva is common to the Marquesas, and (. insularis occurs 
in the Gambier group. C- striata is abundant in the Austral and Cook’s Islands. 
H-licina minuta is found in the Austral, and H. flavescens in the Cook’s group. 
Assiminea nitida ranges from the Paumotu to the Viti Islands. Plecotrema mordax 
occurs in the Paumotu, and I think inhabits the Gambier Islands. Laimodonta 
conica ranges from the Paumotu to the Cook’s, and occurs on the islands in central 
Pacific. All the Melampi, except striatus, have a more or less wide range. 
The following species, unknown to the writer, are accredited to the Society 
Islands :-— 
Helix cceanica, Le Guillou. “Taiti.’? Is a Libera and probably = L. Heyne- 
manni. No mention is made of internal lamella 
Helix Jacquinoti, Pfeiffer. “Tahiti” and “ Marquesas.” In his Mon. Hel., vii, 
he quotes “'Taheita” only. It is a Libera with the peculiar sculpture of L. fratercula, 
and probably inhabits the Austral Islands. 
Helix depressiformis, Pease. ‘Tahiti.’ May be a Zonites. 
Succinea procera, Gould. “ Eimeo” — Moorea. Possibly a large elongate form 
of the variable 8. pudorina. 
Suceinea Bernardii, Recluz, ‘+ Oceania” (Recluz); “ Tahiti” (Cuming). 
Cyclostoma ventricosa, Hombron and Jacquinot. “Taheiti.’ Pfeiffer quotes the 
“ Marquesas.” Should be compared with Atropis viridescens. 
Hydrocena Scherzeri, Zelebor. ‘“* Tahiti.” Is, I think, a variety of Omphalotropis 
scitula. 
