LIFE-CYCLE OF " CYSTOBIA " lEHEGULARTS (mINCH.). 91 



{b) C. minchinii, p. 13. 



Probable mode of infection, p. 14. 



Relation of the parasites to tlie coelomic epithelium, p. 14. 

 Situation in which the parasites encyst, p. 17. 

 Conclusions, p. 17. 

 (t) Form, size, and general appearance. 

 (<■/) C. irregularis, p. 19. 

 {b) C. minchinii, p. 20. 

 {c) Diplocystis sell neideri, p. 22. 

 Triple association, p. 24. 

 (5) Minute structure. 



{a) Nature of the peripheral region and composition of the septal 

 plane, p. 24. 

 Loss of the power of movement, p. 26. 

 Consideration of D. sch neideri, p. 20. 

 The investing membrane, p. 27. 

 (/y) General cytology, p. 28. 

 The cytoplasm, p. 28. 

 The nucleus, p. 29. 

 {c) Formation and probable function of the karyosome, p. 31. 



Expulsion of karyosomatic material into the nucleoplasm, p. 32. 

 SigniQcance of the process, p. 33. 

 (G) Commencement of sporulation. 

 (fl) Encystment, p. 34. 

 C. irregularis, p. 34. 

 C. minchinii, p. 3G. 

 {b) Fragmentation of the karyosome, p. 37. 



Nuclear incorporation of the fragments, p. 39. 



(7) Nuclear multiplication. 



{(i) Nature of the early nuclear divisions, p. 40. 



{b) Distinction of the multiplying nuclei into two classes, somatic and 

 germinal, and their further history, p. 42. 



Nature and origin of the division-centres, p. 43. 



Indirect nuclear division, p. 45. 



Independent division of the centrosomes, p. 46. 



Disintegration of the sterile nuclei, p. 47. 



(8) Formation of gametes (sporoblasts) and conjugation, p. 48. 



Segregation of the sporoblasts, p. 49. 

 The gametes, p. 50. 

 Conjugation, p. 51. 



Absence of any movement, p. 52. , 

 The actual union, p. 53. 

 Abnormalities, p. 54. 



