Dccapoda — Brachyura. 



75 



are used Idv the males in fie;htin" with each other, and are also Table-case 



No 16 

 helieved to serve to attract the females. 



Gelaswitis tangcri 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 tlie 



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 arc smaller, and are regarded as of inferior quality. 



Fig. 50. 

 GclasiDius tangcri, male (below) and female (above). [Table-case No. 16.] 



The genus Maciophthcdmiis (Fig. 51) has already l)een men- 

 tioned (p. 72) as having a superficial resemblance to the Portunid 

 Podoplithahmis. 



The members of the family I'iiniothcridae 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, Strongylocentrotns 

 (jibbosiis, found on the coast of Chile. One lialf of the shell has 

 been cut away to show the Cnih l'tii>ii(.foiU's cJuloisis lying in a 



