30 
ROOM IX. 
Nat. Hist. 
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 consen¬ 
taneous inmates with the animal, and bound by mutual 
interest. The Painted or Land Crabs (Gecarcinus), 
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, (Leucosia), 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 pro¬ 
jecting 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 (DorimaJ. 
Cases 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 (Galathea), 
and the Crab Lobster (Porcellana), which, from the 
shortness of their tails, generally resemble crabs in ap¬ 
pearance; the Scorpion Lobster (Thalassina), which 
lives great part of its life on land, and destroys the new 
made roads in India by the excavations it forms under 
them; Lobsters (Astacus), one specimen exhibited 
was 
