BRITISH ZOOPHYTES. 121 



Movable T,emato-|j,^^^^^^^^_ 

 phores always j ^^^^^ 

 present. J 



Movable nematoO o 



1 bTATOPLEA. 



phores never ^ 



present. J 



Gonopbores ■> 



witbspecial [ ELErTHEEOPLEA 



protective f phylactocaepa. 



apparatus. J 

 Gonopbores "j 



destitute of | Eletttheboplea 



protective ( gymnocakpa. 



apparatus. J 

 Gonopbores 1 



witlispecial ' Statoplea phy- 



protective [ lacxocabpa. 



apparatus. ^ 

 Gonopbores "1 



witbout i Statoplea gym- 



protective \ nocaepa. 



apparatus. J 



To the EJentlieroijlea gymnocarpa belong the genera 

 Antennularia and PlumuIariCt. To the Statoplea xJnj- 

 lactocarpa, belong the genera Aglaophenia and Lypto- 

 carpus ; and to the Statoplea gymnocarpa belongs the 

 genus Halicornaria. 



The nematophores (so named by Mr. Busk, Hunterian 

 Lectures, 1857) are a peculiarity of this family. Their 

 use has been investigated by Prof. Allman (A. N. H., 

 ser, 3, xiii. 1864, Gymnoblastic Hydi-oids, and Chal- 

 lenger Reports, part xx. 1883), by Mr. Hincks (B. H. 

 Z., xviii.), by Dr. Von Lendenfeld (A. N. H., October, 

 1883), Dr. Metschnikoff, and others; and they seem 

 to be able to eject their contents in the form of " fine 

 granular processes, very extensile and mutable, which 

 have been seen to invest the zoophytes as with 

 gossamer-like threads, and then to be again with- 

 di'awn into the calycle.'" They usually contain thread 

 cells. 



The nematophores are movable in the Eleutheroplea , 

 but not in the Statoplea. In the latter group there 

 * There are no British species of this section. 



