[ 72 ] 
were also presented by Mr. Clarke. — A familiar sight on the 
shore at low ttde, on sandy beaches and ia mangrove swamps, 
are Ocypoda cerntophihalnia ('The Horn-eyed Runner') and 
Gelasimus vocans [ 'The Laughable Calling Crab 'J. The former 
is the larger of the two. It has a square body, and its eyes are 
placed on stalks. On account of their remarkable speed it is 
difficult to catch these crabs when running, but they are easily 
dug out of the sand when they have taken refuge in their 
boles. The other species, Gelasimus vocans, is smaller, gaily 
coloured blue and red, and the males have one of their claws 
enormously enlarged which they brandish about in a ludicrous 
fashion as if beckoning.— There are quite a number of crabs 
belonging to the genus Potamou which live in fresh water and 
in damp places in the jungle, even at high elevations.— A com- 
mon sight on Christmas Island is the little red land-crab 
{Gecarcinnsi lagostomus). It is met with anywhere tn the jungle 
where it honeycombs the ground with its burrows. Once a year 
it goes to the sea to spawn, and during these migrations incre- 
dible numbers of them are seen, which are exceeded only when 
the young ones have been hatched and return to the land 
The Macritni include Lobsters, Craj^ishes, Prawns, 
Shrimps and Hermit Crabs. There is no local species which 
closely resembles the English Lobster and Crayfish. Nearest 
perhaps comes Thalassina anomahi. This species is only rarely 
seen, though its high and conical mounds, so common in man- 
grove swamps and on newly reclaimed land, are familiar sights 
in Singapore. It has a pair of pincers, like the Enghsh Lob- 
ster, but differs from it by its !ong and narrow abdomen. By far 
the largest of local lobsters is Pantdirits fasciatus. It has no 
pincers, and its first pair of legs is not larger than the other 
four pairs. A full-grown specimen measures close on two feet, 
and its antennae two or three feet in addition. A near ally, 
though smaller and much different in external appearance, is 
Themis arientalis. It has a curiously flattened body and has no 
pincers either, and its outer antennae have been transformed 
into broad plates.— Of Prawns and Shrimps there is a great 
variety in these waters. A huge fresh-water species is Palaemon 
carchms the body of which measures 8 inches and the pincers 
not less than lO inches. A curious little Shrimp {Alpheus sp.) 
lives on the Coral reefs, e.g. at Blakang Mati, where it is gene- 
rally found adhering to Feather Star Fishes, or hidden in the 
crevices of corals and sponges. It is only about inches in 
length. It has two pairs of pincers. The second pair is very 
