INTRODUCTORY NOTE 
N O particular attention was paid to the collection of Mollusca either by 
Mr. Annandale or myself, and, as has been noted previously, the 
drought that prevailed during a great portion of our stay in the 
Siamese Malay States was very unfavourable to most forms of invertebrate 
life. The majority of our collecting stations, moreover, were situated on 
granite, where the molluscan fauna is naturally poor, but the limestone hills 
and caves in the vicinity of Biserat would probably afford a rich harvest if 
carefully searched during the rainy season. The districts covered by the 
‘ Skeat ’ Expedition and ourselves in the Eastern States were, to all intents and 
purposes, identical, and the fact that out of thirty-eight species in the two lists 
only one is common to both, shows that on the Eastern side of the Peninsula, 
at any rate, almost everything remains to be done in this branch of zoology ; 
though on the west coast our knowledge is much more complete owing to the 
researches of Stoliczka, Godwin-Austen, De Morgan, and Moellendorf. 
HERBERT C. ROBINSON 
