GLOSSARY. 



857 



by the repeated budding from a sin- 

 gle individual. 

 Zoecium — the membranous or calcar- 

 eous cup surrounding the base of the 

 expanded zooid and into which the 

 animal can withdraw for protection. 



Zooid — an individual animal of a colony 

 of Hydrozoa, Anthozoa or Bryozoa. 



Zygous — paired. In cephalopods, re- 

 ferring to the paired lobes and sad- 

 dles. All are paired except the si- 

 phonal and antisiphonal lobes. 



