ROOM IX. 
Nat. Hist. 
SO 
in front of the body, as if they were beckoning to some 
one at a distance, whence they have acquired the name 
of Calling Crabs (Cancer vocans, Linn). What has 
been said of the rapidity of the motions of these Crus¬ 
tacea, is particularly applicable to those of the genus 
Ocypode, which hide in holes in the sand on the sea¬ 
shore during the day, and leave them at sun-set. This 
Case also contains specimens of the genus Pinnotheres, 
a very small race of Crustacea, which inhabit bivalve 
shells, and were supposed by some of the ancients to be 
consentaneous inmates v/ith the animal, bound by mutual 
interest. The Painted or Land Crabs (Cecarcinus), 
live in holes in the earth, especially near burying- 
grounds, and only go to the sea during the breeding 
season; their flesh is considered a delicacy, but some¬ 
times proves deleterious. Besides the preceding, there 
are specimens of the Globular Crabs, ( Lencosia), Sea 
Spiders, with their very long legs (Leptopodia), Crested 
Crabs (Calappa), having the front part of the claws 
raised into a crest, and the hinder part of the shell 
projecting so as to cover the legs; and lastly, those 
Crabs which have the two hinder pairs of legs placed 
on their back, (Dorippe,) and the Death’s-head Crabs 
( Dromia). 
Cases Nos. 5, 6, and 7 contain the Exochnata, or 
Long-Tailed Crustacea, as the Lobsters and Shrimps; 
amongst which, those of the genus Hippa have the ex¬ 
tremity of the tail simple. The Soldier Crabs live 
principally in the large cavities often observed in 
sponges, and in spiral shells, the texture of some of 
which, by means not understood, they occasionally alter 
to such a degree, as to render it quite soft, and easily 
perforated by a common pin. Amongst these is a fine 
Cancer latro, said to live on the nuts of the palm trees. 
Also specimens of the Sea Locust (Scyllarus) the Rock 
Lobsters (Palinurus), the Plated Lobster ( GalatheaJ, 
and the Crab Lobster, ( Porcellana ,) which, from the 
shortness of their tails, generally resemble crabs in ap¬ 
pearance ; 
