268 ELEMENTS OF COMPARATIVE ZOOLOGY. 



broadened arms erect to catch the wind, as it is often said 

 to do. The Decapoda include the squid, the sepia, and other 

 forms. The smaller squid are abundant, and are caught in 

 large numbers for bait in fishing for cod. Near Newfound- 

 land, and in other parts of the world, giant squid are occa- 

 sionally found, the largest one known having a body length 

 of twenty feet. The length of the arms was not mentioned 

 in the account. 



COMPAEISONS. 



With two columns, as before, for clam, oyster, and squid, 

 answer the following questions : 



(1) Is the body bilaterally symmetrical ? 



(2) Is there a mantle ? 



(3) Are gills present ? 



(4) Is there a foot ? 



(5) Do you find cerebral, pedal, and visceral ganglia ? 



(6) Does the alimentary canal pass through the nervous 

 system ? 



