166 PROCEEDINGS OF THE ACADEMY OF [PaRT I 



23. Lauterborn, R. Protozoenstudien — IV. Flagellaten aus dem Gebiete des 



Oberrheins. Zeitsch. f. wiss. Zool. Bd. 65. 1899. 



24. Lemmermann, E. Notizen iiber einige Flagellaten. Arch. f. Hydrobiol. 



d Planktonkunde. Bd. 8. 1912-13. 



25. MoROFF, T. Beitrag zur Kenntniss einiger Flagellaten. Arch. f. Frotistenk. 



Bd. 3. 1903. 



26. Pascher, a. Rhizopoden und Palmellastadien bei Flagellaten. Ibid. Bd. 



25. 1912. 



27. Pascher, A. Siisswasserflora Deutschlands, Oesterreichs und der Schweiz. 



Jena, 1913-14. 



28. Penard, E. Ueber einige neiie oder wenig bekannte Protozoen. Jahrb. 



Nassauischer Vereins f. Naturkunde. Bd. 43. 1890. 



29. ScHERFFEL, A. Kleiner Beitrag zur Phylogenie einiger Gruppen niederer 



Organismen. Botan. Zeitung. 1901. 



30. ScHERFFEL, A. Beitrag zur Kenntniss der Chrysomonadinen. Arch. f. Pro. 



tistenk. Bd. 22. 1911. 



31. ScHouTEDEN, H. Notes sur quelques Flagellees. Ibid. . Bd. 9. 1907. 



32. Stein, F. von. Organismus der Infusionsthiere. 1878. 



33. Stokes, A. A preliminary contribution toward a history of the freshwater 



Infusoria of the United States. Journ. of the Trenton Nat. Hist. Soc. 

 Vol. I. 1888. 



34. Stokes, A. Notices of new freshwater Infusoria. Proceed, of the Amer. 



Philos. Soc. Vol. 28. 1890. 



35. VoiGT, M. Beitriige zur Kenntniss des Planktons Pommerscher Seen, Th. 



IV. Forschungsber. Plon. Th. 9. 1902. 



Explanation of Plates V, VI, VII, VIII. 



Plate V. — Figs. 1-3. — Pteridomonas scherffeli. 



1. Normal aspect; at the left side, captured food; at the lower end, the 

 posterior crown of pearls. 



2. Another specimen, with some "flagellopodia" vibrating. 



3. Another, in course of division. 



[Note — The flagella of the above figures have been strengthened 

 slightly to insure reproduction. — Editor.] 



Figs. 4-6.^ — Dimorpha tetramastix. 



4. Heliozoan state. 



5. Flagellate state. 



6. Flagellate state, with some trailing pseudopodia. 

 Figs. 7-8. — Dimorpha monomastix. 



7. Heliozoan state. 



8. Flagellate state. 

 Figs. 9-13. — Bicoeca exilis. 



9. Typical appearance. 



10. Another individual, seen from the side. 



11. Disposition of the flagellum in the enrolled state. 



12. An animalcule retracted in the capsule, and about to throw off its 

 flagellum. 



13. Swimming form. 



Plate VI. — Figs. 14-19. — Histiona campanula. 



14. Typical form. 



15. Another specimen, seen from another viewpoint. 



16. Extremity of the trunk-like appendage. 



17. Swimming form, with anterior flagellum undulating. 



18. Another individual, with posterior flagellum vibrating. 



19. An animalcule in successive stages of the act of attaching after swim- 

 ming. 



Figs. 20-28. — Salpingoeca polygonatum. 



20. Normal aspect. 



21. Division, nearly completed. 



22. The flagellated animalcule, as it comes from division. 



