218 



ACTINOZOA. 



prominent wing-like appendages, and may possibly 

 yet prove to be but an imperfectly developed 

 member of the group (cZ). 



In one large division of the order two wide 

 diverging lobes project from the antero-posterior 

 regions of the body, far beyond the level of the 

 mouth, which, by their approximation, they some- 

 times wholly conceal. Between these lobes, in 

 Bolina and its allies, occur on either side two 

 small lateral appendages, or earlets. Four of the 

 ctenophores, much shorter than their fellows, run 

 to the bases of these, along which they are con- 

 tinued as simple ciliated fringes. The earlets, 

 therefore, may be regarded as specially modified 

 prolongations of the lateral ctenophores. 



Eurhamphosa, one of these lobed Ctenophora, is 

 remarkable for the general elongation of the axis 

 of the body, which is, moreover, much compressed 

 from side to side (6). The two lateral actinomeres 

 terminate in long tapering appendages, which 

 project for some distance beyond the apical extre- 

 mity of the animal, and then curve gently upwards 

 and outwards. Of a similar nature, but much 

 shorter and wider, are the apical appendages, or 

 lappets, of some Beroidce. 



The mouth of the Ctenophora varies as to size, 

 degree of prominence, and the relative develop- 

 ' of distinct lips. Even in the same indivi- 

 dual its form, at different periods, presents many 

 diversities of aspect. It attains a very large size 

 in Beroe and its allies, extending right across 

 almost the entire oral extremity, in its usual 

 antero-posterior direction. Hence Leuckart has 

 proposed to divide the Ctenophora into two sepa- 

 rate groups; the Eurystomata, corresponding to 



ment 





