424 BIOLOGY OF THE PROTOZOA 



Family 3. Peranemidae Stein. 



1 . Body metabolic 2 



Body rigid 3 



2. Body with endoplasmic rod ("Stab-"' 



organ) Genus Peranema Dujardin 



Body without endoplasmic rod Genus Euglenopsis Klebs 



3. Endoplasm with rod apparatus .... Genus Urceolus Mereschkowsky 

 Endoplasm without rod apparatus 4 



4. Periplast smooth 5 



Periplast heavy, with 1-7 longitudinal fur- 

 rows or ridges Genus Petalomonas Stein 



5. Periplast delicate Genus Scytomonas Stein 



Thick and heavy Genus Thylacomonas Schewiakoff 



Family 4. Trypanosomidae Doflein. 



1. Undulating membrane absent 2 



Undulating membrane present 6 



2. Definitive hosts plants — cysts absent 



Genus Phytomonas Donovan 

 Definitive hosts animals 3 



3. Vertebrate and invertebrate hosts. .Genus Lei sh mania Ross 

 Invertebrate hosts only 4 



4. Protoplasmic body extended around base 



of flagellum Genus Crithidia Leger 



Flagellum without protoplasmic extension . 5 



5. Kinetoplast always anterior to nucleus 



Genus Leptomonas S. Kent 

 Kinetoplast posterior to nucleus in some 



phases Genus Herpetomonas S. Kent 



6. Hematozoic forms only in vertebrate 



Genus Trypanosoma Gruby 

 Hematozoic and cytozoic forms in verte- 

 brate 7 



7. Cytozoic phases in erythrocytes .... Genus Endotrypanum 



Mesnil et Brimont 

 Cytozoic phases in organ cells and tissues 



Genus Schizotrypanum Chagas 



Family 5. Bicoecidae Stein. 



1. Cells with proboscis-like process at flagel- 



lum base 2 



Cells with thin periplastic process . . Genus Bicoeca Lauterborn 



2. Cells without contractile thread; process 



sail-like Genus Histiona Voigt 



Cells with posterior contractile thread 



Genus Poteriodendvon Stein 



Family 6. Craspedomonadidae Stein. 



1. Individuals with one collar 2 



Individuals with two collars 17 



2. Individuals without lorica or test 3 



Individuals with lorica 10 



3. Individuals solitary 4 



Individuals colonial 5 



4. Cells with very short stalks or none. .Genus Monosiga S. Kent 

 Cells with very long stalks Genus Codonosiga S. Kent 



