7G 



IXVEMTEBRATE ANIMALS. 



CHArXEE YIII. 



SUB-CLASSES LUC'ERNARIDA, GRAl^OLITID.'E, 

 AND HYr)RO(;:ORALLIN.'E. 



SrB-cr,ASs Lucernarida. 



The next gvduii of the living /fijthxKnii is tliat of the Ziicernarida, 

 under wliich name are iiichided a con- 

 siderable number of forms, differing from 

 one another to a great extent in external 

 ajppearance. It will be sufficient hereto 

 describe one or two tyjiical forms. 



One grouji of the Liicernariila is rejire- 

 senteil liy Liici'muria itself (tig. 41), in 

 which there is a cnp-shaped body of a 

 moi-e or less gelatinous consistence, usu- 

 ally attached by its smaller extremity 

 to sea-weed.s, this end of the boily being- 

 developed into a small sucker. Like the 

 Jfi/dra, however, Lueernaria is not fixed, 

 but can detach itself at will, and can even 

 swim freely by means of the alternate 

 contraction ami ex)iausion of the cup- 

 .sliajied body (or "umbrella," as it is 

 termed). Rdund the margin of the cup 

 .■ire tufts fif short tentacular processes, 

 a}id in its centre is fixeil a single polypite, 

 fiuiiished with a four-lobed mouth. The 

 essenti.d elements of rejiroduction are de- 

 V(dopeil within the body of Lueernaria 

 ilself, anil it does not give off any genera- 

 ti\e buds, as so commonly occurs in other 

 forms. 



idii is rei)re.sented by the organisms 



formerly leiiiied "hidden-eyed" 2ft'ihi!<a\ and familiarly known as 





.In], I 



-Tw.i K]i. 



11). 



■d Cill 



Aniitlicr tyiie of the LiirrriKir 



