A CONTRIBUTION TO THE MORPHOLOGY AND 

 BIOLOGY OF THE STENTORS. 



HERBERT P. JOHNSON. 



CONTENTS. 



Page 



I. Introduction 468 



Methods 469 



II. Systematic and Faunistic 471 



1. Stentor igneus 472 



la. S. igneus var. nigricans 473 



2. ^S". pyrifonnis 474 



3. S. roeselii 476 



4. S. polymorphus 477 



5. S. cceridetis 477 



III. Morphology 478 



A. Anatomy 479 



1. Ecto- and Endoplasm 479 



2. Ectoplasmic Structures 480 



a. Pellicula 480 



b. Stripes 481 



c. Myonemes 483 



d. Pigment 485 



e. Cilia; " Tactile spines " 486 



3. Pharyngeal Funnel 488 



4. Endoplasmic Structures 489 



a. Membranellas 489 



b. Foot 492 



5. Nuclei 493 



a. Meganucleus 493 



b. Micronuclei 498 



c. Generalia 500 



B. Fission 500 



1. Cytoplasmic Phases 501 



2. Nuclear Phases 512 



a. Meganucleus 512 



b. Micronuclei 517 



3. Ontogeny and Phylogeny 518 



C. Regeneration 521 



1. Cytoplasmic Phases 522 



2. Nuclear Phases 523 



3. Generalia 525 



467 



