234 BUNTING. 
EXPLANATION OF PLATE II. 
[Figs. 22-44 X 94. 45-47 X 31. All drawn from life, with exception of Figs. 
30 and 45.] 
Fic. 22. Unsegmented eggs, showing the formation of the polar globules. 
Fic. 23. Extrusion of one polar globule, division of the other one. 
Fic. 24. Two-celled stage in process of formation. Protoplasmic band at 
one pole. Primary blastomeres, 4, B. (50 min.) 
Fic. 25. View of same ovum. Beginning of second cleavage; cleavage 
centrifugal. (1 hr.) 
Fic. 26. View of same ovum. Second cleavage almost completed; proto- 
plasmic bands. Fainter lines represent the points of contact of cells at the 
opposite pole. (1 hr. 1o min.) 
Fic. 27. Commencement of third cleavage, movement of blastomeres. (1 hr. 
20 min.) 
Fic. 28. The same egg as in Fig. 26; eight-celled stage. (1 hr. 30 min.) 
Fic. 29. The same egg as in Fig. 27 ; sixteen-celled stage. (1 hr. 35 min.) 
Fic. 30. Embryo consisting of a spherical mass of cells. (About 2 hr. 
30 min. Drawing from preparation.) 
Fic. 31. Planula oval in shape. (10-11 hrs.) 
Fic. 32. Ciliated planula. (16-17 hrs.) 
Fic. 33. Movement of blastomeres; unusual segmentation; beginning of 
second cleavage. 
Fic. 34. Same egg five minutes later ; completion of second cleavage. 
Fic. 35. Same egg seventeen minutes later; beginning of third cleavage. 
Fic. 36. Abnormal planula. 
Fic. 37. Two blastomeres of one ovum ; separated by cutting. 
Fic. 38. Same two blastomeres five minutes later. 
FIG. 39. Blastomere of an ovum shaken apart when two-celled ; beginning of 
first cleavage (properly second cleavage). 
Fic. 40. Same half embryo fifteen minutes later. 
Fic. 41. Same half embryo fifteen minutes later than in 4o. 
Fic. 42. Same half embryo twenty minutes later than 4I. 
Fic. 43. Half planula. (About 18 hrs.) 
Fic. 44. Half planula, ciliated. (About three days.) 
Fic. 45. Longitudinal section of young blastostyle before formation of gono-. 
phore. Glands, g, in gastral region ; ova, ov, in germinal region. 
Fic. 46. Outline drawing of male blastostyle with gonophores. 
Fic. 47. Outline drawing of female blastostyle with gonophores. 
