212 



SYSTEMATIC ZOOLOGY. 



is saccular. Here belong the octopus, poulpes, etc., as 

 well as the paper nautilus, which does not sail with its 

 shell as a boat, and its 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 



FIG. 47. Octopus bairdii. From Verrill. One arm on the right side is modi- 

 fied for purposes of reproduction. 



are abundant, and are caught in large numbers for bait 

 in fishing for cod. Near Newfoundland, and in other 

 parts of the world, giant squid are occasionally found, 

 the largest one known having a body length of twenty feet. 

 The length of the arms was not mentioned in the account. 



SUMMARY OF IMPORTANT FACTS. 



1. The MOLLUSCA receive their name from the soft 

 nature of the body, in which the body-cavity is greatly 

 reduced. 



2. They have a body from which a foot depends below 



