191 L] Knowledge of the Protozoa of the Soil. 



169 



13. Enchelys sp. ?, a small form, occasionally found from arable and pasture soil. 



14. Chilodon sp. ? (Ehrb.) (PI. 4, fig. 3), fairly common from arable and pasture soiL 



Has only two contractile vacuoles. 



15. Colpoda cucidlus (0. F. M.) (PL 4, fig. 4), very widely distributed and extremely 



common in arable and pasture soil. 



16. Colpoda steinii (Maup. em. Enriques) (PL 4, fig. 6), as common as Col. cucullus. 



17. Colpoda maupasii (Enriques), only found once or twice from a pasture soil. 



18. Balantiophorus elongatus (Schew.) (PL 4, fig. 7), fairly common in arable and pasture 



soils. 



19. Balantiophorus minutus (Schew.), found in culture from only one soil. 



20. Cryptochilum nigricans (Maup.), fairly common from a manured arable soil. 



21. An unclassified ciliate. 

 Order. — Hypotricha (Stein). 



Some difficulty has been experienced in accurately placing the different species of this 

 order. Nos. 22, 26, and 27 are only provisionally placed. 



22. Gastrostyla steinii (EngeL), a very large form, found on two occasions from arable 



soil, devouring Col. cucullus. 



23. Urostyla grandis (Ehrb.), found in cultures from a manured arable soil. 



24. Gonostomum affine (Stein) (PL 4, fig. 9), rather widely distributed, found in many 



arable and pasture soils. 



25. Pleurotricha grandis ? (Stein) (PL 4, fig. 8), same remarks apply as to 21. 



26. Pleurotricha lanceolata (?) (Ehrb.), a long, flexible form, with pointed posterior 



end, from an arable soil. 



27. Oxytricha sp. (?), a form from a manured garden soil. 

 Order. — Peritricha (Stein). 



28. Vorticella microstoma (Ehrb.) (PL 4, figs. 10, 11), fairly common in occurrence, from 



arable soil. 



29. Vorticella putrinum (Kent), found in cultures from a sewage farm soil. 



30. Epistylis coarctata (C. and L.), rather large organism from a pasture soil. 



(c) Active Protozoa found on the Surface of the Soil. — About the middle of 

 December, 1910, some wet, rotting mangold leaves were collected from the 

 surface of Barnfield, Plot 2. There had been an abundance of rain and the 

 ground was very wet. Some of the water from the surface of the leaves was 

 sucked up and then examined under the microscope. There were numerous 

 free living Cercomonas, some small Amoeba Umax, a few Colpoda cucullus 

 and many Urostyla grandis ; all of them belonging to species found in 

 soil cultures. 



On other occasions, wet grass leaves and stalks from the surface of the soil, 

 or from very close to it, have been examined. On these I have found active 

 Cercomonas, Colpoda cucullus, Amoeba verrucosa, Amoeba Umax, Epistylis 

 coarctata, and a small hypotrichous ciliate which I have not been able to 

 classify. 



One would, of course, expect to find active protozoa in situations such as 

 these, where there is an abundance of moisture for them to swim about in. 



