78 ART. 3. S. IKEDA : CONTRIBUTIONS 



which was futher enlarged by fresh exudation. Embryonic 

 body stretched forward from this and was short compared 

 with the normal. Original ex-ovate on the middle point of 

 the secondary ex-ovate as before. 



Although the results are imperfect, the manner of the blasto- 

 pore closure and the location of the embryonic body are as in 

 Egg No. 6 of Groups I., and IV. 



Egg No. 7. 



Punctured close above the middle point of the dorsal 

 blastopore lip. Injury very slight. Ex-ovate very small. 

 Dorsal lip seems to have been able to overcome the injury 

 easily, for at 9:09 a.m., next day (April 29), it had already 

 cleared from the ex-ovate and grown downward to about 

 35° below the equator. Segmentation cavity grown moderately 

 small as also the blastopore circle which was not entirely 

 circular but somewhat oval, the dorsal lip being drawn up a 

 little toward the ex-ovate. Soon after this, ex-ovate became 

 detached, and therefore development proceeded entirely nor- 

 mally and the embryo formed was normal. 



This incidentally proves that, as remarked by Assheton 



('94<7,), an egg is able to recover sooner or later from a slight 



injury, and is able to develop in an entirely normal manner. 



Egg No. 8. 



April 28, 1:24 p.m.: — Punctured at both the upper and lower poles. 

 Lower injury much more severe, so much so that one hour after 

 the lower hemisphere was somewhat diminished in size and 

 there was a distinct space between the egg and the vitelline 

 membrane. 



April 29, 9:20 a.m. : — Blastopore area and area of the segmentation 

 cavity equally diminished in a moderate degree. Unfortunately 

 a new ex-ovate produced in front i.e. dorsad of the lower 

 puncture. Dorsal lip had, however, already grown over the 

 new obstacle and was nearer the original ex ovate than the 

 ventral lip. 



