424 
PACIFIC SCIENCE, Vol. IX, October, 1955 
Leptopoma vitreum Lesson, 1830 
This species was comparatively common 
on vegetation on Stirling Island. It has been 
recorded elsewhere in the area from Guadal- 
canal Malaita and Santa Anna (Rensch, 
1936), Shortland Islands and Simbo (Smith, 
1885), Bismarck Archipelago (Rensch, 1937), 
Nissan Island (Dell, 1955), and the writer has 
specimens from Savo Island, coll. R. R. 
Foster, -4-1944. 
Pupina solomonensis E. A. Smith, 1885 
Smith in his original description recorded 
this species from Treasury Island, but it does 
not appear to have been collected since from 
that locality. Species of this genus are, how- 
ever, often local and may be overlooked ea- 
sily. The distinction between this species and 
P. keraudreni Vignard appears to be slight, 
and the two forms have a similar range 
throughout the Solomon Islands. 
Palaina gardneri n. sp. 
Fig. If, d 
Shell small, dextral, turretted, light brown 
in colour, but generally stained. First one and 
a half whorls with numerous fine axials. Sub- 
sequent whorls with numerous thin, raised, 
rather oblique lamellae which are more widely 
spaced on the body whorl (24 on penulti- 
mate). 
Whorls six and a half, the first one and a 
half whorls mammillate, the following whorls 
gradually increasing, resulting in a turretted 
outline. Suture impressed, periphery rounded. 
A constriction in the shell of the body whorl 
above the aperture, the axials much finer and 
closer in the constriction. Aperture rounded, 
toothless, peristome continuous, the parietal 
portion compressed against the body whorl, 
margin thickened, expanded. 
Height, 4.64 mm.; diameter, 2.27 mm., 
height of aperture, 1.64 mm. 
holotype: (M. F. 2516) and paratype (M. 
F. 2517) in Dominion Museum, Wellington. 
Two paratypes in the collection of Mr. N. 
Gardner, Auckland, New Zealand. All spec- 
imens collected by N. Gardner, 1944. 
locality: In leaf mould from ridge above 
Seveke River, Mono Island, Treasury Group. 
This appears to be the first species of the 
genus to be recorded from the Solomon Is- 
lands, although it is known from many of the 
surrounding island groups, e.g., Bismarck 
Archipelago (Rensch, 1937), New Hebrides 
(Ancey, 1905), New Caledonia and Lord 
Howe Island. The turretted outline disting- 
uishes this species from any of the geo- 
graphically neighbouring forms. 
The species is named for Mr. N. Gardner 
who collected the type series and generously 
donated this and other material to the Do- 
minion Museum. 
Iredale (1944: 303) has discussed the ques- 
tion of the type species of Palaina and shown 
that it must be one or other of the only two 
identifiable species listed originally by Sem- 
per. Of these two species Iredale has selected 
macgillivrayi Pfeiffer from Lord Howe Island 
as type. 
Diplommatina aerari n. sp. 
Fig. lb 
Shell small, sinistral, spindle shaped, light 
brown. Whorls five and a half, apical whorls 
worn but first one and a half whorls appar- 
ently smooth. Following whorls with numer- 
ous raised, somewhat oblique lamellae, be- 
coming more widely spaced on body whorl. 
Interstices with fine growth lines. The first 
one and a half whorls are mammilate, follow- 
ing three rapidly increasing, body whorl 
somewhat restricted. The major part of the 
body whorl above the aperture considerably 
depressed. The axials finer and more numer- 
ous in the depression. Body whorl rather 
angled at each side of the depression. Suture 
impressed. Aperture rather oblique, peristome 
continuous, subcircular, almost fused to the 
body whorl at the depression. A rather weak 
tooth in the centre of the peristome on the 
columellar side. Margin thickened, slightly 
channelled. 
