Organisms Consisting) of One Cell 



251 



out various inferences concerning certain important aspects of 

 development^ even though the observations were mostly limited 

 to the completed organs. To these latter we shall return 

 the chapter on development and heredity. * 



m 



FIOTTRK 7. CniTlTTniA LEPTOCORIDIS (aFTER McCULLOCh). 



ax., nxostyle. bas.gr., basal gramile. chr.gr., chromatin granule. 

 f1., flageJluni. n., nucleus, rh., rblzoplast. und.ni., undulating mem- 

 brane, vac, vacuole-like area about the "kiuetonucleus." kn., kine- 

 tonucleus. 



So far our glance at the complication of structure occur- 

 ring among the protozoa has been directed chiefly to the 

 organs of contact with the outside world. These organs are 

 particularly characteristic of the large species, and in gen- 

 eral of those leading the freest, most active lives. From the 

 relative conspicuousness of these organs and the ease with 



