PROTOZOA or THE UNIVERSITY CAMPUS 263 



Body flattened, leaflike, with a tail-like posterior prolongation; color usually 

 green; eye-spot present; flagellum single 9- 



8. Body usually rounded anteriorly, with a colorless tail-like posterior prolongation; 



length of body 50-75 11 Euglena viridis Ehr.i 



Body elongate, wormlike; color green; length when extended 50-100 jW 



Euglena deses Ehr.* 



9. Body flattened, oval in outline, with a short posterior tail-like projection, usually 

 curved; surface longitudinally striated; endoplasm bright green 



Phacus pleuronectes Miill. 

 Body with a long tapering tail-like projection, usually straight; endoplasm green 



Phacus longicaudus Ehr.* 



10. With cilia during entire existence (Subclass Ci/iate) 11. 



With cilia during embryonic life only; ■ with suctorial or piercing tentacles during 

 adult Hfe (Subclass Suctoria) 28. 



11. Cilia usually covering the entire body, sometimes slightly longer about the oral 

 aperture;, trichocysts often present (Order J?o/o^rzcfefl) .... 12. 

 Body entirely ciliate, cilia of the oral region longer than those of the general 

 surface and often fused together (Order Heterotricha) .... 24. 

 Usually flattened, with cilia confined to the ventral surface (Order Hypotricha) 



25. 

 Cilia reduced to one or two wreaths or circles; stalked forms (Order Peritricha) 



26. 



12. With sculptured shell made of numerous pieces; ovate or barrel-shaped, cylindrical, 



length 60 fi Coleps hirtus Ehr. 



Without shell I3- 



13. Cilia uniform over body 14. 



With a single row of large cilia Mesodinium sp.* 



CiUa only on ventral surface 22. 



14. Mouth vdthout protruding undulating membrane IS- 



Mouth with protruding undulating membrane 20. 



15. Mouth terminal or nearly so; no proboscis 16. 



Mouth somewhat posterior to anterior end, on the ventral surface; no proboscis 



18. 



16. With a long neck; not flattened; neck capable of being extended many times the 



length of the body (very abundant) Lacrymaria olor Miill. 



Without a neck; pharynx long and evident 17. 



17. Mouth terminal, provided with minute rodlike teeth; length of body 150-200^1 



Prorodon teres Ehr. 

 Mouth eccentric, opening into a conical tube which reaches far into the endoplasm 



Prorodon edentatus C. & L.* 



18. Mouth in middle, or posterior; length 230 m • Paramaecium caudatum Ehr. 

 Mouth anterior to middle 19. 



19. Elongated oval, wider anteriorly; mouth lateral, appearing as a slotlike opening 



Frontonia leucas Ehr. 



» In material collected by Luden Shattuck one or two hundred yards beyond the boundary of the 

 campus we found Eutreptia viridis Perty (determined with the assistance of Dr. Edmondson), new to Colo- 

 rado. It is like an elongate Euglena, but with two flagella, and most extraordinary peristaltic movements. 



