960 DESCEIPTIOX OF THE ENGRAVINGS. 



X300 (Cienkowsky). 72,73. Enclielys Pupa. 74-76. Stylonycliia pustulata: 74. the 

 animalcule encysted, x300. 75,76. Kotating cells within the cysts, X 220 (Cienkowsky). 



PLATE XXIX. (Protozoa.) 



Figure 1. Yorticella Campanula, viewed from the rentral aspect. 2. Carchesium 

 polypinum, viewed in front and directly upon the ciliated disc : i, the mouth ; e, the anus. 

 3. Scyphidia limacina. 4. Opercularia berberina, seen from the back. 5, 6. Chsetospira 

 Miilleri : 6 represents the animal in motion. 7. Stentor polymorphus, showing vascular 

 canal around the head and along one side. (1-7, Lachmann.) 8-13. S. cseruleus, and its 

 supposed iutexmal germs or embryos in different stages of development (Eckhard). 14, 15. 

 Trichodina Pediculus : 14. A lateral view ; 15. Anterior extremity. 16. T. mitra. 17. 

 T. Pediculus, a dead, distended specimen. (14-17, Stein.) 18. Stylonychia pustidata, 

 encysted (Stein). 19, 20. Amphileptus fasciola: seen encysted in fig. 19, and as escaped 

 from the cyst in fig. 20. 21-24. Oxytricha Pellionella : 21. Encysted ; 22. Cyst acted 

 upon by hydrochloric acid ; 23. Animal revived in its cyst prior to its escape ; 24. The 

 free animal. 25-34. Paramecium (Loxodes, Colm) Bursaria, its structui-e and develop- 

 ment : 25 to show circulation of contents ; 26. Portion of integument liighly magnified ; 

 (19-26, Cohn;) 27. Transverse fission; 28. Nucleus seen at c, the nucleolus at d; 29. 

 Embryo attached to the nucleus ; 30. Embryo escaped but still adherent by acinetiform 

 tentacles ; 31. Nucleus and attached nucleolus separated by acetic acid ; 32, 33. Nucleus 

 and nucleolus during fission of animal ; 34. Nucleus, nucleolus, and commencing embryo. 

 35-47. Kolpoda CucuUus, illustrating its forms and development : 37. Acted on by alcohol, 

 to bring its nucleus into view; 38. An animal contracted into a spherical shape; 39. A 

 similar one undergoing fission; 40. Encysted Kolpoda; 41. Same, in act of fission; 42. 

 Fission completed ; 43. Specimen treated with alcohol ; 44. Cyst-contents divided into 

 four ; cyst- wall soft and irregular ; 45. Embryo escaping from a cyst ; 46. A ruptured 

 cyst giving exit to encysted germs, as seen in 47. 48-59. Cliilodon Cucullulus : 48 b. The 

 so-called dental cyhnder ; c, nucleus and nucleolus ; 49. A specimen with a large upper 

 lip, equivalent to "C. uncinatus (Ehr.) ; 50. Transverse, and 51. Longitudinal fission ; 52. 

 Contracted prior to encysting ; 53, 54. Cysts ; in 54 an embryo developed ; 55. Appa- 

 rently laminated cyst discharging its contents; 56, 57. An empty cyst, with the aperture 

 tln'ough which its contents have escaped remaining ; 58. A cyst containing a parent animal 

 and an embryo ; 59. A liberated embryo, equivalent to Cyclidimn Glaucoma (Ehr.). 

 (26-69, Stein.) 



PLATE XXX. (Protozoa, after Stein). 



Figures 1-4. Opercularia articulata: 2. A highly magnified view of the head; 3, 4. 

 Supposed Acinet^e of this species ; an embryo shown in fig. 4. 5-8. Ophrydium versatile: 

 In 5 the animal is seen extended, and in 6 contracted ; 7. Encysted animal ; 8. Its sup- 

 posed Acineta. 9, 10. Carchesium polypinum : 10. A liighly magnified view of its stem. 

 11. Epistylis crassicollis. 12. Cothurnia curva. 13, 14. C. Sieboldii : 14. A side view. 

 15, 16. C. Astaci : 16. Animal contracted. 17-26. Spirochona gemmipara, and its develop- 

 ment: 17 exhibits a gemma; 18-20. Progressive development of the spiral head in a 

 gemma ; 21. Encysted gemma ; 22. Supposed Acineta (the Dendrocometes) in its early stage; 

 23. As fully developed ; 24. Embryo (seen in 23) set free ; 25. A Dendrocometes, without 

 arms, but with a contained embryo ; 26. A free embryo revolving on its long axis. 27, 28. 

 Spirochona Scheutenii ; 28. After the action of spirit of wine. 29-36. Lagenophrys 

 Vaginicola, its structure and development : In 29 a gemma is seen in the act of fission ; in 

 30 the animalcule has its rotatory apparatus retracted ; 31 shows the detachment of the 

 head of the animal from the mouth of its sheath, to allow escape of a gemma ; 32. Act of 

 fission ; 33. Formation of a gemma at posterior extremity ; 34. Several gemmae enclosed ; 

 35, 36. Act of fission ; complete in fig. 35, where the parent segment is detached from the 

 orifice of the sheath, leaving a portion of its interior extremity. 37. Opercularia micro- 

 stoma: A, extended; b, contracted. 



PLATE XXXI. (Protozoa). 



Figures 1-4. Bursaria leucas, and the position and structure of the trichocysts found 

 in its integument : 1. X 90 ; 2. Diagram of the margin, to show position of trichocysts in 

 the dermal layer ; 3. Trichocysts projected from the surface after the application of acetic 

 acid ; 4. Detached spiral trichocysts in the second stage of evolution from elongated oval 

 corpuscles (Allman). 5-6. Coretliria Sertulariae : in 5 the two sorts of processes are both 



