34 



THE AMPHIOXUS. 



SECOND NIGHT. 



FIRST SEIUKS. 



SECOND SERIES. 



THIRD SKRIES. 



o CLOCK 



7.0. 5 Mesoblastic 

 Somites. 



8.0. 5-6 Meso- 

 blastic So- 

 mites. 



9.0. 6 Mesoblastic 



Somites. 



10.0. 7 Mesoblastic 

 Somites. 



11.30. 8 Mesoblastic 

 Somites. 



12.0. 8 Mesoblastic 

 Somites. 



1.0. 8-9 Meso- 

 blastic So- 

 mites. 



2.0. 8-9 Meso- 

 blastic So- 

 mites. 



3.0. 8-9 Meso- 

 blastic So- 

 mites. 



4.0. 9-10 Meso- 

 blastic So- 

 mites. 



5.0 9-10 Meso- 

 blastic So- 

 mites. 



O CLOCK 



O'CLOCK 



7.0 G-7 Meso- 

 blastic So- 

 mites. 



8.30. 8 Mesoblastic 



Somites. 



10.0. 9 Mesoblastic 

 Somites. 



12.0. 10 Mesoblastic 

 Somites. 



2.0. 14 Mesoblastic 

 Somites 

 (weak mus- 

 cular move- 

 ments.) 



4.30. 12-13 Meso- 

 blastic So- 

 mites. 



6.0. 12-13 Meso- 

 blastic So- 

 mites. 



