Figure 203. Anoplophrya {Collinia) circulans in Asellus aquaticus. A, B, large indi- 

 viduals showing nuclei and pulsating vacuoles; C, terminal portion of antenna broken 

 at end, ciliates enclosed in blood vessel and escaping into water, on contact with which 

 some disintegrate; D, thoracic leg containing ciliates; E, segment of the basal part of an 

 antenna, ciliates carried in opposite directions in the currents of blood. (After Balbiani, 

 1885.) 



