OPALINID CILIATE INFUSORIANS — METCALF 



483 



bent to one side at the anterior end. The layer of ectosarc is fairly 

 thick. The endosarc in the axial region of the body contains numer- 

 ous endospherules, and 4 to 6 (usually 4) elhpsoidal or rounded nuclei. 

 The number of the nucleoli, as seen in midanaphase, are distinctly 6. 



SOji. 



Figure Zl .—Protoopalma pingi Nie: A group of individuals showing the range of size and shape. (After 



Nie.) 



In a number of animals measured length of the body varies from 55 

 to 160iu, width of the body from 12.5 to 26ju, diameter of the nucleus 

 from 10 by 5m to 12.5 by 7.5/*. 



Genus ZELLERIELLA Metcalf 



ZELLERIELLA BRASILIENSIS (Pinto) 



Figure 38 



Host: Crossodactylus gaudichaudii Dumeril and Bibron, from Rio 

 de Janeiro, Brazil, one specimen, 16 nmi. long, uninfected, and a 



FiouEK SS.—ZeUeriella bTasiliensis (Pinto) from Cronoiactylus gaudichaudii: a, X 460; 6, X 249; c, X 117; 



d, X 7; e. X 1010. 



