[ ?6 ] 
bristles, is Chbeia fiavn, whicli resembles the Sea-mouse of 
English seas. It is frequently found at tow tide at Tanjong 
Rhoo and on sandy beaches generally. These two species are 
free swimming and prey on other animals. But some poly- 
chaete worms live in tubes and their food consists of vegetable 
matter. These tubes may be leathery and flexible, or they may 
be built of sand and fragments of shells, or they may be 
calcareous. Attached to the head of these worms are the gills 
which have the shape of delicate branching trees. When the 
animals are undisturbed, the gills are fully expanded, offering a 
beautiful sight, but when disturbed in the slightest degree they 
are instantaneously retracted. Exhibited is SabeUa sp. which 
has a leathery tube. 
LEECHES (HirmUnea.) 
The Leeches differ from the Polychaetes by the complete 
absence of bristles. They have a more or less flattened and 
highly contractile body, with two suckers. The sucker at the 
posterior end of the body merely serves for attachment The 
anterior sucker leads into the mouth. Most leeches are aquatic, 
but there are certain tropical forms ( //fMVW£irf/>5fi sp,} living on 
land which infest swampy jungle and are much dreaded 
by travellers, 
CEPHYREA. 
The Gephyreans are marine worms of cylindrical shape, 
showing nu segmentation. Two large species from Gaya, B. N. 
Borneo, are exhibited, Stpu fiat ins robust us and S, ntidus. They 
live in the sand and are used as bait. The specimens were 
presented by the late Mr. H. S. Haynes, in igoo. They measure 
l8 and 12 inches in length respectively, 
FLAT WORMS (Platlwlmintlies.) 
The best-known Flat Worms are the parasitic species 
like the Tapeworm {Taenia solium) and the Liver Fluke {Dis- 
tomum hepaticum). But there are many more free living species. 
They are all exceedingly flat, but may be long and tape-like, or 
broad and leaf-like. Cerebratulus is a long and narrow form. 
The specimen shown, measuring fully 24 inches in length, was 
collected on the coral reefs of Blakang Mati in 1898. ThysanO' 
soon is leaf-like. The exhibited specimen, also from loca! reefs, 
was presented by the late Mr. F. P. Bedford in 1 899, An 
interesting group are the Planarians . of which there are fresh- 
