PLATE 2 



EXPLANATION OF FIGURES 



10 Same; sea water and acetic acid; one section of spindle showing lagging. 



11 A, B, C. Same;>sea water and acetic acid; chromosomes: 30 and 35. 



12 A,B. Hipponoe 9 X Toxopneustes c?. Longitudinal sections of anaphase 

 of first division; chromosomes: 22 and 29. 



13 Same ; chromosomes : 39 and 36. 



14 Same; chromosomes : 28 and 24. 



15 A, B. Same; chromosomes: 27 and 24. 



16 Same; single section showing lagging. 



17 A, B. Same; anaphase of third division; chromosomes: 30 and 25. 



18 A, B. Same; chromosomes: 31 and 32; those at center not counted. 



19 Same; single section showing lagging. 



20 A, B. Same; anaphase in one cell of sixteen cell stage; chromosomes: 16 

 and 16; two at center not counted. , 



28 



