Decapo da — Brackyura . 
75 
are used by the males in fighting with each other, and are also Table-case 
believed to serve to attract the females. No ' 16 ' 
Gclasimus tangeri occurs on the Spanish coast near Cadiz, 
where there is a regular “ fishery ” for these Crabs. Only the 
large claws of the males are taken, and are prepared for the 
market by cooking and then drying. After the claw has been 
torn away, the Crab grows a new one in its place, but these 
regenerated claws are smaller, and are regarded as of inferior quality. 
Fig. 50. 
Gelasimus tangeri, male (below) and female (above). [Table-case No. 16.] 
The genus Macrophthalmus (Fig. 51) has already been men- 
tioned (p. 72) as having a superficial resemblance to the Portunid 
Podophthalmus. 
The members of the family Pinnotheridae are small parasitic 
or commensal Crabs, living in the mantle-cavity of bivalve Mollusca, 
in Ascidians or Echinoderms, or in coral-stocks. The shell is 
usually soft, and the eyes, antennules, and antennae much reduced. 
A preparation is exhibited of a Sea-Urchin, Strongylocentrotus 
gibbosus, found on the coast of Chile. One half of the shell has 
been cut away to show the Crab Pinnctxodes chilensis lying in a 
