THE EATABLE SHRIMP 225 
legion. The hind margin of the carapace is overlapped at 
the sides by the first segment of the pleon; in the rear the 
pleon is laterally compressed. The eye-stalks are short 
and one-jointed. ‘The first antennez have two flagella, the 
second have a large scale, and all the joints of the pedun- 
cle free. The mandibles are without a cutting edge, and 
have no ‘ palp.’. The second maxillipeds end in a rudi- 
mentary sixth joint, and the third pair have neither the 
sixth nor the seventh joint. ‘The second and third pairs 
of trunk-legs are slender, the others robust. The pleo- 
pods are two-branched, the swimming-fan well developed. 
This family at present contains some eight or nine 
genera, in most of which the second pair of trunk-legs are 
more or less chelate, but in Salinea, Owen, 1835, they are 
simple, and in Paracrangon, Dana, 1852, this pair of legs 
is completely obsolete. 
Crangon, Fabricius, 1798, the parent genus, has the 
carapace and minute rostrum dorsally flattened. ‘The type 
species, Crangon vulgaris (Linn.), is abundant on the sandy 
shores of Great Britain. So also in the Mediterranean 
and on the shores of Europe at large, in the seas of Japan, 
on the East and West Coasts of North America, in short 
over all the northern hemisphere this species seems to 
make itself at home wherever there is a plentiful supply of 
fine sand. Apparently in the zoological ideas of many 
persons it is not only the typical shrimp, the shrimp par 
excellence, but the only shrimp. At least the information 
that there is more than one species of shrimp, in fact that 
there are several or indeed a rather large number of species, 
often excites surprise not always wholly unmingled with 
scepticism. Familiar also as the eatable shrimp is to 
every one, vague notions sometimes prevail as to its ana- 
tomical structure. A very intelligent student, on being 
told that the eyes were stalked, candidly confessed to 
having always thought that this appearance was due to 
their having been forced out of the head by boiling. The 
colour of the species is said to vary much with the ground 
it inhabits, but specimens that live in shallow waters are 
of a speckled grey which harmonises well with the wet 
