82 
NATURAL HISTORYc [n. ZOOL. GAL. 
Ocypode, (Case 17,) which hide in holes in the sand on 
the sea-shore during the day, and leave them at sun-set. 
The genus Pinnotheres , is a very small race of Crustacea, 
inhabiting bivalve shells, and supposed by some of the an¬ 
cients to be consentaneous inmates with the molluscous 
animal, and attached to it by mutual interest. The Painted 
or Land Crabs (Gecarcinus), Case 17, 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 it sometimes proves deleterious. Besides the 
preceding, there are specimens of the Globular Crabs (Leu- 
cosia), Case 19 ; Sea Spiders (Leptopodia), Case 13, with 
their very long legs; 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 
(Case 19), ( Dromia ). 
Long-tailed Crustacea, (Cases 20, 22,) as the Lobsters 
and Shrimps ; amongst which, those of the genus Hippa, 
(Case 20,) have the extremity of the tail simple. The 
Soldier or Hermit Crabs, (Pagurus, Case 20,) live prin¬ 
cipally in the cavities of sponges, and also in the mouth of 
spiral shells, occasionally altering the texture of the latter, 
by some unknown process, to such a degree as to render 
them quite soft, and easily penetrable by a common pin. 
Amongst these is a fine specimen of Birgus latro , (Case 20,) 
said to live on the nuts of palm trees. Also specimens of 
the Sea Locust (Scyllarus), the Rock Lobsters ( Palinurus )> 
Case 21, the Plated Lobster (Galathea), Case 20, and the 
Crab Lobster ( Porcellano ), which, from the shortness of 
their tails, generally resemble crabs in appearance; the 
Scorpion Lobster (Thalassina), Case 21, which lives 
a great part of its life on land, and destroys the new made 
roads in India by the excavations it forms under them; 
Lobsters ( Astacus ), Case 21, one of the specimens exhibited 
was pale red, nearly of its present colour when alive ; 
Shrimps (Palcemon), Case 22, varying greatly in size. 
The Stomatopodes or Sea Mantis, differ from the Deca - 
podes in the head being horny and separated from the 
thorax, and in having only three pairs of accessory jaws, 
seven pairs of feet, and the gills on the abdomen ; among 
