I 83 ) 
Great Britain alone, of which the most familiar arc the Garden 
Snail ilL (tspersa) and the larger Eciibte Snail (//. ponuitM). 
The Pulmonates are divided into iwo sections, the 
Stylammatophora- which are terrestrial, have two pairs of tenta- 
cles and have their eyes placed on the lip of the posterior pair 
of tentacles, and the Btisommatophm'a which are generally 
aquatic, havt- one pair of tentacles only ami have the eyes 
placed at the base of the tentacles. A further difference h that 
in the Stylommatophora the tentacles are entirely retractile with- 
in themselves, w^hilst in the Bfisommatophoru they are only 
contractile. 
The best -known of the Socal Rasummatophom are the 
Earlet Shells, Auricula judae and the larger A. auris mUiae. 
They are common in mangrove swamps and have an elongated, 
thick, brown shell. A smaller, but also very common snail is 
Pythia sairiihueus. It has an oval, compressed shell, with a 
pointed spire and is one of the few members of the group 
which are entirely terrestrial. It is generally found in jungle 
close to the sea. Much more typical Bas&mmatoplutra are 
Limnaea and Plajwrbis. They live exclusively in freshwater 
and have thin horny shells, of greenish colour, but whilst 
Limmwti is long and pointed, Phnmrbi.K is flat and disk-shaped, 
its convolutions lying all in one plane. Many species of either 
genus are known from India. In the Malay Feninsnb, how- 
ever, apparently only a Platiorbis has so far been cJiscovered, 
in Kinta. 
The StyhmtuHitophora inckulc most Land Snails and all 
Slugs. Singapore island is poor in both of theni» though the 
Peninsula, especially the limestone hills, are somewhat richer. 
The most common garden snail on the island is a smalJ species, 
Nanina mmirwides. It has a brown shell, about % inches in 
diameter. Much larger is Nmmut humphnysiaiui which grows 
up to 2f4 inches in diameter. It is not unfrenuently met with 
on Bukit Timah, in the Botanical Gardens and elsewhere. 
Common under stones and flowerpots are various species of 
Pupa, a small elongated and almost cylindrical shell. A hunrl- 
some bright yellow or yellowish green species is Bulimus 
Amphidronius) perversus. Two specimens of it. fn>m Sclitar, 
presented by Master Karl Hanitsch in 1897, are exhibited. 
Very similar in shape is B, inversus, from the Botanic Gardens, 
which is light grey with slanting birown stripes. Of Slugs a 
flat yellowish-grey species { Vagtnula) is common under stones 
on Fort Canning, whilst at Teluk Ayer the rocks at and above 
high water mark are sometimes found covered with a sj^ies 
