THE OPALINID CILIATE INFUSORIANS. 



163 



0.004 nun., third nucleus 0.0055 mm. by 0.0055 mm. ; cilia line interval, 

 anterior 0.00235 mm., posterior 0.00325 mm. 



a 



FIO 131 — CEPEDBA CANTABaiGENSIS, FROM RANA CANTABRIGBNSIS LATIREMIS : a, A GROUP 

 OF CELLS MAGNIFIED 117 DIAMETERS; 6, MAGNIFIED 460 DIAMETERS. 



This Cepedea has long cilia. Its nuclei are mostly ellipsoidal, 

 though not much elongated except in active mitosis. It suggests com- 



