THE OPALINID CILIATE INFUSORIANS. 



103 



Ten macrochromosomes. 



This is a broad Zelleriella, with the posterior end of the body not 

 pointed, but a few of the smallest daughter cells, apparently the 

 result of rapid division, are more slender and wedge-shaped, with 

 the posterior end tapering to a rounded, never a sharp, point. The 



Fig. 70.- 



-Zelleriella palodicolae, from palddicola bibron'ii ; a, magnified 1,000 



DIAMETEBS ; 5, A DAUGHTER CELL MAGNIFIED 460 DIAMETERS. 



resting nuclei are nearly spherical, being but little elongated in one 

 diameter. Fission occurs Avhile the two nuclei are but little more 

 advanced than this in mitosis. The nuclei of the daughter cells 

 thus formed at once enter upon mitosis, so that we find some of them 

 with slightly elongated nuclei, some with more ellipsoidal nuclei, 

 others with spindle-shaped nuclei in the equatorial plate stage 



