Organisms Consisting of One Cell 



251 



out various inferences concerning certain im]:)ortant aspects of 

 development, even though tlic observations were mostly limited 

 to the completed organs. To these latter we sliall return in 

 the chapter on development and heredity. 



FTGTTRE 7. CRTTITTDTA LEPTOCORiniS ( AFTER MoCULLOCh). 



ax., axostyle. has.gr., basal granule, chr.gr., chromatin granule, 

 fi., flagelluni. n., nucleus, rh., rhizoplasi:. und.ni., undulating mem- 

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

 to nucleus. 



So far our glance at the complication of structure occur- 

 ring among the protozoa has been directed chiefly to tlie 

 organs of contact with the outside world. These organs are 

 particularly characteristic of tlic large species, and in gen- 

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

 relative conspicuousness of these organs and the ease witli 



