EDMONDSON — PROTOZOA OF IOWA. II9 



without a differentiation between endoplasni and ectoplasm. 

 F'rom the.se lobes are thrust out, often to a great distance, slender 

 and distinctly capitate tentacles. 



Dr. Stokes did not observe the nucleus, which is usually invis- 

 ible without the aid of reagents. It is, however, band-like, with 

 its ramifying branches extending toward and even into the bases 

 of the marginal lobes. In these regions metabolic changes prob- 

 ably take place rapidly, since the protoplasm within the lobes 

 may readily be seen to be in violent agitation as the tentacles are 

 extended and withdrawn. In TrichopJirya sinuosa there is what 

 seems to be an example of the disposition of the nucleus of the 

 animal cell where it can best influence metabolism. The speci- 

 mens observed in this state were much greater in size than the 

 dimensions given by Dr. Stokes. 



