82 BRITISH HYDROID ZOOPHYTES. 



GLOSSARY. 



Alimentary polypite. The polypite 

 whose only duty is to obtain and assimilate 

 food. 



Athecata. The word means " sheath - 

 less," and is applied to the Lower Division of 

 the Hydroida, in which the poJypite is not 

 protected by a horny receptacle, as in the 

 Higher Division. 



Capsule. Strictly; speaking, the well 

 formed horny receptacle or case which 

 encloses in the Thecaphora all that represents 

 the " select " polypite, together with the 

 reproductive buds containing the ova. It is 

 often applied to the whole body thus 

 represented. 



Coenosarc. The word means " common 

 flesh," that is, that portion of the compound 

 animal structure, in the Hydroids, which is 

 common to, or which connects, the individual 

 polypites. 



Gonophore. The reproductive bud 

 with its envelope, as occurring in the 

 Athecata, and where it is distinct from the 

 polypite or bud which bears it. 



