1919] 



Kofoid-Swezy: Triclioiujmpha campanula 



45 



Shape and Size 

 The shape of the body is compaaiulate with the posterior end 

 broadly rounded (fig. B), almost spheroidal, while anteriorly it is a 

 tapering, slightly convex cone of 20°. The anterior half of the body 



Pig. A. Triolionympha campanula, drawn from life, showing metabolic 

 changes in the posterior portion of the body of the normal trophozoite. X 186. 



has a transdiameter of about one-half or less than that of the posterior 

 part. It is contracted to a slender acuminate point at the anterior end 

 which is surmounted by a rounded, transparent, caplike structure 

 (fig. B, oper.) which we call the operculum. This covers a shallow 

 depression at the base of which is a small pit surrounded by a darkly 

 staining ring (fig. C, 5, 9). The ba.se of this pitlike depression may 



