EXPLANATION OF PLATE XXXIL 



Fig. 



1-8, ICHTHYOPHTHIRIUS MULTIFILIIS, Fouquet, vol. ii. p. 530. — 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. Paramecium marinum, S. K., vol. ii. p. 488, x 250. 

 10. Lembus elongatus, C. & L. sp., vol. ii. p. 549, X 300 (Clap. & Lach.). 

 II, 12, Maryna socialis, Gruber, vol. ii. p. 520. — 11, Social colony within branched 

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

 13. TiLLiNA magna, Gruber, vol. ii. p. 514, x 190 (Gruber). 

 14, 15. Haptophrya gigantea, Maupas, vol. ii. p. 569 — 14, Adult animalcule, ventral 

 aspect, X 33 ; 15, acetabulum, x 50 (Certes). 



16. LOXOCEPHALUS LURIDUS, Eberhard, vol. ii. p. 489, x 100 (Eberhard). 



17. Enchelyodon elongatus, C. & L., vol. ii. p. 504, X 150 (Clap. & Lach.). 



18. Metopides contorta, Quenn., vol. ii. p. 583, x 275 (Quennerstedt). 



19. Opalina ranarum, Purk., vol. ii. p. 559. — Showing temporarily assumed 



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



20, 21. Nyctotherus Gygeryanus, Stein, vol. ii. p. 580.— Ventral and lateral aspects, 

 X 200 (Stein). 



22. Balantidium medusarum, Meresch., vol. ii. p. 578, x 600 (Mereschkowsky). 

 23, 24. Calceolus CYPRIPEDIUM, J.-Clk. sp., vol. ii. p. 619. — Ventral and lateral 

 aspects, X 200 (Jas.-Clark). 



25, 26. DiCTYOCYSTA MITRA, Hkl., vol. ii. p. 623. — 26, Empty lorica, x 230 (Haeckel). 



27. DiCTYOCYSTA TEMPLUM, Hkl., vol. ii. p. 625, — Empty lorica, x 400 (Haeckel). 



28. DiCTYOCYSTA TIARA, Hkl., vol. ii. p. 626.— Empty lorica, x 400 (Haeckel).' 

 29-31. DiCTYOCYSTA CASSIS, Hkl., vol. ii. p. 624. — 29, Empty lorica, showing cribrate 



structure, X 165 ; 30, extended animalcule, containing germinal bodies g, 

 depending from its lorica, x 165 ; 31, isolated germ, X300 (Haeckel). 



32-34. TORQUATELLA TYPICA, Lankester, vol. ii. p. 621. — 32, Animalcule with oral 

 membrane contracted ; 33 and 34, examples, viewed laterally and from 

 above, with this structure variously expanded. Dimensions unrecorded 

 (Ray Lankester). 



35-38. Halteria GRANDINELLA, Miill. sp., vol. ii. p. 632. — 35 and 36, Lateral and 

 ventral aspects, X 600 ; 37, animalcule dividing by transverse fission ; 38, 

 example with its springing-sette deflected in the act of leaping. 



39. Halteria volvox, Eichwald, vol. ii. p. 632, x 250 (Claparede & Lachmann). 



40. Mesodinium acarus. Stein, vol. ii. p. 635, x 400, as observed by the author. 



41. Arachnidium convolutum, S. K., vol. ii. p. 638, X 400. 



42, 43. Arachnidium BIPARTITUM, From, sp., vol. ii. p. 638. — 42, Ambulatory, and 43, 

 free-swimming examples, x 400 (De Fromentel). 



44. Mesodinium pulex, C. & L. sp., vol. ii. p. 636, x 350 (Clap. & Lach.). 



45. ACARELLA SIRO, Cohn, vol. ii. p. 636, X 250 (Cohn). 



46. Strombidium Claparedii, S. K., vol. ii. p. 634, x 200. 



47. Strombidium sulcatum, C. & L., vol. ii. p. 633, x 200 (Clap. & Lach.). 



48, 49. Arachnidium globosum, S. K., vol. ii. p. 637. — Examples with tentacles 

 extended and contracted, x 1 200. 



50-57. DiDINlUM NASUTUM, Miill. sp., vol. ii. p. 639.-50, Normal aspect of natatory 

 animalcule, as observed by the author, x 200; 51 and 52, ilhistrating the 

 seizure and engulfment of a Paramccciuin 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. 



