STUDIES IN ANIMAL LIFE. 



63 



Now tlie head is drawn in — as if it were swallowed 

 — and suddenly in its place are unfolded two broad 

 membranes, having each a circle of waving cilia. 

 The lifeless oval has become a hving animal ! You 

 have assisted at a resuscitation, not from death by- 

 drowning, but by drying: the animal has been 

 drowned into life ! The unfolded membranes, with 

 their cilia, have so much the appearance of wheels 

 that the name of "Wheel-bearer" {jRotiferd) or 

 " Wheel Animalcule" has been given to the animal. 



Fig. 16.— Eotifee Vcloaeis. 

 A, with the wheels drawn in (at c). B, with the wheels expanded; 6, eye 

 spots; e, jaw and teeth ; /, alimentary canal; j;, embryo; ft, embryo further 

 developed ; ? , water-vascular system ; fc, vent. 



