TO THE EMBRYOLOGY OF AMPHIBIA. 69 



ward, and the circle complete ; ovate in shape, the pointed 

 extremity extending toward and reaching the right ex-ovate. 

 Place of the small left ex-ovate already grown over and now 

 outside the blastopore. 

 2:15 p.m. :— (Fig. d). Blastopore circle grown much smaller. But 

 quite unexpectedly a new short transverse ex-ovate was found 

 attached close to the ventral lip. Right ex-ovate now also 

 oustide the blastopore circle, hut a string-like prominence with 

 rough surface connecting it with the new transverse ex-ovate 

 (its nature not clear). We may suppose that a large new 

 obstacle appearing to hinder the progress of the ventral lip, 

 the right lip had time allowed it to overcome the right ex- 

 ovate and to grow down toward the ventral lip producing 

 somehow the string-like prominence in its track. If this new 

 obstacle had not appeared, the blastopore might have closed 

 much nearer the right ex-ovate. Neural plate not yet recog- 

 nizable, although usually seen at this stage. 

 April 25, 5:07 p.m.: — (Fig. e). General outline of the embryonic body 

 with partly closed neural groove and closely approximated 

 folds distinct. Embryo short and curved to the right. Right 

 ex-ovate attached to the right side of the embryonic head ; 

 left ex-ovate in the former position. Transverse ex-ovate at 

 the posterior end of the embryo. 



The actual point of the blastopore closure and the location 

 of the embryonic body were somewhat obscured in this egg. But 

 the former, we may suppose, was a little to the left of the yolk- 

 pole, and the embryonic body was directed from this point ob- 

 liquely toward the point which corresponded to the right edge of 

 the dorsal blastopore at its first appearance, as shown in Fig. 90. 

 The inclination of the embryonic axis to the former blastopore 

 meridian is about 4ô 



.TO 



Egg No. 5. 



April 23, 3:40 p.m.: — Taken out of another egg-mass. It was intended 

 to puncture the egg at the anti-blastoporic region as in the 



