ROTIFERA. 



301 



Brachionus), or becomes a ciliated cephalic shield (Megalotrocha, 

 Tubicolaria). Finally it may be produced into ciliated processes 

 of various form (Floscularia, Stephanoceros). The cilia are con- 



FIG. 245. Vela of various Rotifera (after Hudson and Gosse). 1, Rhizotic velum, front view 

 (Melicerta ringens). 2, Rhizotic velum, side view (M. ringens). 3, Velum of Floscularia 

 campanulata. k, Bdelloidic velum (Rotifer citrinus). 5, The same, side view. 6, Bdelloidic 

 velum of Adineta vaga. bf the buccal funnel ; pw the principal ring of cilia ; sw the 

 secondary ring ; lp the lips ; cw the velum. 



cerned with locomotion, but in addition they play an important 

 part in procuring food. 



Locomotive organs. In addition to the foot and trochal disc, 

 there are often styliform processes of the body, into the bases of 



