EXPLANATION OF PLATES. 447 



8-12. Fire apparently nonciliated individuals with rapid undulating movement in spiral 

 lines. 



13. A dead individual retaining the nucleus and undulatory cord. 



14. Lateral view of a ciliated individual. 



15. End view of the same. 

 16-lY. Two ciliated individuals of narrow fusiform shape. 



18-26. DiNENYMPHA GRACILIS. 



18. A large individual, containing considerable food. 666 diameters. 

 19-21. Three individuals, exhibiting different forms assumed in movement. "750 diameters. 



22. Individual, containing a row of spore-like bodies. 666 diameters. 

 23, 24. Two small individuals. 666 diameters. 



25,26. Two individuals, apparently with a fascicle of long cils at the upper end. 500 dia- 

 meters. 



21. Gregarina termitis. 666 diameters. . 

 28-34. Arthromitds cristatus. All 1333 diameters except Fig. 33, which is 666 diameters. 



28. Filaments with spores in pairs, separated by wide intervals. 



29. Filaments with slightly oval spores. 



30. Filament with elongated spores. 



31. Comparatively robust filament with spores, arranged as usual, with the partitions of 



the articulation visible. 



32. A robust filament, with spores and distinct articulations, and with young plants 



attached. - ||{ 



33. A bunch of Arthromitus from Spirobolus marginatus. 



34. Portion of a filament, with spores, the articulations of the filament granular in appear- 



ance, and with attached germinating granules. 



35. Arthromitus intestinalis. From the large intestine of Blatta americana. 1333 



diameters. The spores seen in a transverse position. I 



36-39. YiBRio TERMITIS. 333 diameters except those of Fig. 39, which are 666 diameters. | 



