EXPLANATION OF PLATE XXXII. 



FIG. 



1-8. ICHTHYOPHTHIRIUS MULTIFILIIS, Fouquet. i, Adult animalcule, x 120 ; 2-5, 

 successive phases of segmentation following upon encystment, and resulting 

 in the subdivision of the entire body-mass into a swarm of minute ciliated 

 germs ; 6, ciliated germ, x 350 ; undeveloped germ with twisted thread-like 

 cuticular extensions of the opposite poles ; 8, oral apparatus viewed from 

 above (Fouquet). 



9. PARAMJECIUM MARINUM, S. K., x 250. 



10. LEMBUS ELONGATUM, C. & L. sp., x 300 (Clapardde & Lachmann). 

 11, 12. MARYNA SOCIALIS, Gruber. n, Social colony within branched granular 



zoothecium, x 60 ; 12, isolated animalcule, x 120 (Gruber). 

 13. TILLINA MAGNA, Gruber, x 190 (Gruber). 



14, 15. HAPTOPHRYA GIGANTEA, Maupas 14, Adult animalcule, ventral aspect, x 33 

 15, acetabulum, x 50 (Certes). 



1 6. LOXOCEPHALUS LURIDUS, Eberhard, x 100 (Eberhard). 



17. ENCHELYODON ELONGATUS, C. & L., x 150 (Clap. & Lach.). 



1 8. METOPIDES CONTORT A, Quenn., x 275 (Quennerstedt). 



19. OPALINA RAN ARUM, Purk. Showing temporarily assumed parallel disposition 



of the cilia as observed by the author, x 100. 

 20, 21. NYCTOTHERUS GYCERYANUS, Stein. Ventral and lateral aspects, x 200 (Stein). 



22. BALANTIDIUM MEDUSARUM, Meresch., x 600 (Mereschkowsky). 

 23, 24. CALCEOLUS CYPRIPEDIUM, J.-Clk. sp. Ventral and lateral aspects, x 200 



(Jas.- Clark). 

 25, 26. DICTYOCYSTA MITRA, Hkl. 26, Empty lorica, x 230 (Haeckel). 



27. DICTYOCYSTA TEMPLUM, Hkl. Empty lorica, x 400 (Haeckel). 



28. DICTYOCYSTA TIARA, Hkl. Empty lorica, x 400 (Haeckel). _, 



29-31. DICTYOCYSTA CASSIS, Hkl. 29, Empty lorica, showing cribrate structure, x 165 ; 

 30, extended animalcule, containing germinal bodies g, depending from its 

 lorica, x 165 ; 31, isolated germ, x 300 (Haeckel). 



32-34. TORQUATELLA TYPICA, Lankester. 32, Animalcule with oral membrane con- 

 tracted ; 33 and 34, examples, viewed laterally and from above, with this 

 structure variously expanded. Dimensions unrecorded (Ray Lankester). 



35-38. HALTERIA GRANDINELLA, Miill. sp. 35 and 36, Lateral and ventral aspects, x 

 600 ; 37, animalcule dividing by transverse fission ; 38, example with its 

 springing-setae deflected in the act of leaping. 



39. HALTERIA VOLVOX, Eichwald, x 250 (Claparede & Lachmann). 



40. MESODINIUM ACARUS, Stein, x 400, as observed by the author. 



41. ARACHNIDIUM CONVOLUTUS, S. K., x 400. 



42, 43. ARACHNIDIUM BIPARTITA, From. sp. 42, Ambulatory, and 43, free-swimming 

 examples, x 400 (De Fromentel). 



44. MESODINIUM PULEX, C. & L. sp., x 350 (Clap. & Lach.). 



45. ACARELLA SIRO, Cohn, x 250 (Cohn). 



46. STROMBIDIUM CLAPAREDII, S. K., x 200. 



47. STROMBIDIUM SULCATA, C. & L., x 200 (Clap. & Lach.). 



48, 49. ARACHNIDIUM GLOBOSUS, S. K. Examples with tentacles extended and con- 

 tracted, x 1 200. 



50-57. DlDINlUM NASUTUM, Miill. sp. 50, Normal aspect of natatory animalcule, as 

 observed by the author, x 200; 51 and 52, illustrating the seizure and 

 engulfment of a Paramacium as delineated by Balbiani ; 53 and 54, aspects 

 antecedent to and attending transverse fission (Balbiani); 55, example of 

 abnormal multiple subdivision as delineated by Eberhard; 56 and 57, 

 embryonic conditions, after Balbiani. 



