ACTINOZOA. 



217 



digestive track, a flat ribbon-shaped body, three 

 or four feet in length, being the result (a), Calli- 



Fig. 39. 



Various forms of Ctenophora : — a, Cesium Veneris ; b, Eit' 

 rhamphcBa vexilligera ; c, Beroe rufescens ; d, Callianira triplo- 

 pfcra ; e, Pleurobrachia pileics. (a is considerably reduced ; b, 

 slightly so ; c and e are about the natural size : the size of d is 

 uncertain.) 



anira, a genus of which very little is known, is 

 remarkable for having its ctenophores elevated on 



