468 MORGAN, 



EXPLANATION OF PLATE XXIIL 



{JUtenolabrus^ 



Figs. 1-12. Zeiss 2 D. Abbe camera. 



Figs. 1-6, 9-12. From eggs fertilized June 9, at 7 P.M. 

 Fig. I, A. Blastoderm at 9 a.m., June 10, 14 hrs. old. 



Side view of last. 



Blastoderm at 11 a.m., 16 hours old. 



Side view of same. 



Blastoderm at i.io p.m., 18 hrs. old. 



Side view of same. 



Egg and embryo (side view) at 3 P.M., 20 hrs. old. 



Surface view of embryo of same. 



Optical section, side view, of embryo at 5.30 p.m., 22^ hrs. old. 



Posterior end of embryo and germ-ring of same. 



Posterior end of embryo. 



Optical section, side view, of embryo at 7.05 p.m., 24 hrs. old 

 (June id). 



Surface view of embryo of same in 3 pieces. 



Germ-ring of same and posterior end of embryo. 



Embryo killed in Perenyi, corresponding to 5, A, optical section, 

 side view. 



Head of same, surface view. 



Posterior end of same, surface view. 



Embryo killed in Perenyi, corresponding to 6, A, optical sec- 

 tion, side view. 



Head of same, surface view. 



Posterior end of same, seen from inside. 



Cross-section embryo, 7th section, at 2.10 P.M. 

 " same, 13th section. 



" " 20th 



" embryo, 7th " at 3 p.m. 



" same, 20th " 



" same age, middle of embryo. 



" embryo, 20th section, at 5.30 P.M. 



" same, 31st section, in front of posterior end. 



" embryo, 26th " at 7.05 P.M. 



" same, 32d " 



" same age, 35th section, in front of posterior end. 



" " " 13th " " " " 



