The Land Mollusca of the Treasury Islands, Solomon Islands 
R. K. Dell 1 
In the course of war service in the Solomon 
Islands the writer was stationed on Stirling 
Island in the Treasuries from December 10, 
1943, to January 13, 1944. A collection of 
land snails was made and subsequently this 
was supplemented by a collection made on 
Mono Island at about the same time by Mr. 
N. Gardner. Smith (1885) recorded a number 
of species collected by Guppy from the 
group, but since that time little has been 
added. A great deal of scattered work has 
been published on the land snails of the 
Solomons but few faunal lists have been pre- 
pared for any specific island or group. The 
writer has recently (Dell, 1955) given an ac- 
count of the land snails of an island in the 
northern Solomons (Nissan) and the present 
account presents another step towards a fuller 
understanding of the zoogeography of the 
Solomon Islands. 
The Treasury Group consists of two main 
islands, Mono and Stirling. Mono is a com- 
pound volcanic and coral deposit island some 
five and one half by nine miles in extent 
rising to 1,150 feet. Stirling, slightly to the 
south, is an elevated barrier reef with a com- 
paratively flat surface rising to no more than 
71 feet (Guppy, 1887). Most of the surface 
of both islands was clothed in thick tropical 
vegetation. 
The following account is not complete as 
the exigencies of military service did not 
1 Dominion Museum, Wellington, New Zealand. 
Manuscript received October 9, 1954. 
allow for comprehensive collecting and small- 
er species undoubtedly were missed. Smith’s 
records have been incorporated. The writer is 
deeply indebted to Mr. N. Gardner who 
freely made the results of his collecting avail- 
able and has presented specimens of a number 
of new species to the Dominion Museum. 
LIST OF SPECIES 
Leptopoma vitreum (Lesson, 1830), Stirling 
Pupina solomonensis Smith, 1885, Mono 
Diplommatina aerari n. sp., Mono 
Diplommatina solomonensis n. sp., Mono 
Palaina gardneri n. sp., Mono 
Sturanya modesta (Pfeiffer, 1853), Mono, Stir- 
ling 
Sturanya solomonensis (Smith, 1885) 
Geophorus agglutinans (Sowerby, 1843), Stirling 
Palaeohelicina egregia (Pfeiffer, 1885), Stirling 
Pseudocyclotus levis levis (Pfeiffer, 1885), Mono 
Omphalotropis nebulosa Pease, 1872, Mono 
Papusuccinea simplex (Pfeiffer, 1885), Mono 
Orpiella ( Owaraha ') treasuryensis (Tryon, 1886), 
Mono 
Dendrotrochus cineraceus cineraceus (H. & J., 
1841), Mono, Stirling 
Sheha homhroni (Pfeiffer, 1856), Mono, Stirling 
Papuina cf. gamelia (Angas, 1867), Mono, 
Stirling 
Partula sp., Mono 
Placostylus ( Placocharis ) founaki H. & J. 1854, 
Mono 
Opeas gracile (Hutton, 1834), Mono 
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