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PACIFIC SCIENCE, Vol. XVIII, April 1964 
collection was made in 1928 (see Solem, I960). 
Pupisoma ( Ptychopatula ) dioscoricola (C. B. 
Adams, 1845) ranges from South Carolina to 
southern Florida, and then from southern Texas 
to Brazil. The equivalent Old World species, 
P. orcula (Benson, 1850), is known from Africa, 
India, Indonesia, the Philippines, Australia, and 
some Pacific islands. Quite possibly orcula and 
dioscoricola are synonymous. This species was 
introduced to New Caledonia before 1874. 
Family ENIDAE 
Rhachistia histrio (Pfeiffer, 1855) is an East 
African snail introduced into New Caledonia 
before 1855 (see above). 
Family FERUSSACIIDAE 
Cecilioides ( Geostilbia ) aperta (Swainson, 
1840) is a strictly West Indian species, although 
it was found in the gardens of Noumea before 
1867. 
Family SUBULINIDAE 
Subulina octona (Bruguiere, 1792) is a tropi- 
cal American species that long has been dis- 
persed throughout the tropic and warm tem- 
perate regions of the world. The first New Cale- 
donian record (Layard, 1889), however, was 
on plants imported from Reunion Island off 
Madagascar. 
Lamellaxis ( Allopeas ) gracile (Hutton, 1834) 
was probably originally from the Neotropical 
region, but for almost a century has been pan- 
tropical in distribution. It was first reported 
from New Caledonia in 1859. 
Lamellaxis ( Leptopeas ) mi era (Orbigny, 
1835) is a native of Central and South America 
and the West Indies. It was first collected in 
New Caledonia in 1928. 
Pseudopeas tuckeri (Pfeiffer, 1846) is an 
Australian species reported from New Caledonia 
by Pilsbry in 1906. It has not been dissected 
and its position in the family is uncertain. 
" Opeas ” oparanum (Pfeiffer, 1846) is a 
puzzling form of uncertain affinity widely dis- 
tributed in the Pacific islands. It has not been 
dissected and we have no knowledge of its place 
in the family. Possibly it is a mutant of a West 
Indian or South American species. It was not 
reported from New Caledonia prior to 1958. 
Family HELICARIONIDAE 
Coneuplecta ( D urge Hina ) calculosa (Gould, 
1852) is widely distributed in the Society, 
Cook, and Marquesas islands and evidently has 
been introduced into the Bismarck Archipelago 
(see H. B. Baker, 1941:234-235). The New 
Caledonian introduction was prior to 1868. 
Liardetia (L.) samoensis (Mousson, 1865) was 
recorded from Samoa, Fiji, the Cook, Society, 
Ellice, Marquesas islands, and New Hebrides 
prior to 1870. In New Caledonia the earliest 
collection was prior to 1866. A strongly dif- 
ferentiated group of Liardetia ( subgenera Dasy- 
conus, Oceanesia, and Nesoreus) is endemic in 
the Society Islands, while the majority of the 
species will probably be found to be southeast 
Asian and Indonesian when the helicarionid 
faunas of these areas are adequately studied. 
Diastole (D.) conula (Pease, 1861) is found 
on several of the Society and Cook, islands, and 
also on Rurutu in the Austral Islands. The New 
Caledonian introduction, undoubtedly from 
French Polynesia, was prior to 1958. 
Family ZONITIDAE 
Hawaiia minus cula (Binney, 1841) has been 
recorded from Hawaii before 1850, and from 
Pitcairn and Tahiti in the 1930 s. It was found 
on Lord Howe Island in 1887, was collected on 
Norfolk Island before 1913, and has been re- 
ported several times from European green- 
houses. The first New Caledonian record was in 
1888. 
Family LIMACIDAE 
Deroceras laeve (Muller, 1774) is a Holarctic 
species introduced into many different parts of 
the world. It was widespread in New Caledonia 
by 1911 and probably was introduced before 
1871. 
Family OLEACINIDAE 
Varicella sp. is a member of a West Indian 
group. The not yet identified species was intro- 
duced before 1928. 
