326 s. HATTA : 



right of fig. 13 wliicli represents the Anlage third in a younger 

 embryo. 



The Anlagen above referred to are connected with each other 

 by the solid connecting cords (figs. 21, 23, and 2;j, ed.), which 

 are found between these Anlagen just as described in the younger 

 stages. Of these connecting cords, that between the Anlagen 

 second and third (fig. 23, cd.) is the thickest, while that be- 

 tween the Anlagen third and fourth (fig. 25, cd.) is the weakest 

 in development, owning probably to its having been just established. 

 The cord between the Anlagen first and second (fig. 21, ed.), 

 however, is rather weaker as compared with that in the next 

 posterior intersomitic plane (fig. 23, ed.). Such a case is occa- 

 sionally met with ; but this is doubtless not normal ; in most 

 cases examined, the cord is thickest in anterior segment and de- 

 creases in thickness gradually posteriorly as seen in the last 

 example (see pp. 321-322 and figs. 9-11). 



The Anlage of the pronej)liros belonging to the eighth so- 

 mite and that of tlie ninth somite are not completely cut olf 

 from the myotome to which these respectively belong (figs. 28 

 and 30). They are, however, constricted already at the anterior 

 and posterior borders of the segment : fig. 27 shows the posterior 

 part of the Anlage fifth, and fig. 29 rej^resents tlie anterior 

 part of the Anlage sixth respectively. Such a case is observed in 

 the younger stage described in the foregoing pages (pp. 319-320). 

 Compare these two figures with the right half of Fig. 14 and the 

 description on p. 319 : here the phase of constriction is a little 

 more advanced than there. The anterior part of the Anlage fifth 

 and the posterior part of the Anlage sixth, the figures of which 

 are omitted, have features much like those seen in figs. 27 and 29. 

 In these two segments, the central portion of the Anlage is 



