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 Ctenophoea : — a, Cesium Veneris ; b, Eu- 

 rkamphcBa vexilligera ; c, Beroe rufescens ; d, CalUanira trijplo- 

 'ptera ; e, Pleurobrachia pileus. (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 



