THi5 OPALIXID CILIATE IXFVSOrjAXS. 



225 



mm.: diameter of eiulospheiule. 0.002 mm.; cilia line interval, an- 

 terior 0.002 mm., middle 0.0035 mm., posterior 0.0052 mm. 



This infection, like a number of others of the same sort, is remark- 

 ably uniform in the shape of its Opalinas. Thoy are long, are 



Fig. 1*j9. — OrALiNA ranarum, form truncata, X 460 i>iami:ti:rs. 



parallel-sided through the middle portion of the body, are pointed an- 

 teriorly and broadly truncated posteriorly, the truncated posterior 

 edge being irregular in contour and very thin. The two small dots 

 outside the contour of the body in figure 199 indicate the limits of 

 the morphological anterior end of the body. This anterior edge is 



