58 ART. 3. S. IKEDA : CONTRIBUTIONS 



Egg No. 7. (Figs. 73 «-/, Fig. 82). 



(Cf. Egg No. 3). 



May 5, 12:50 p.m. : — (Fig. a). Punctured closely above the approximate 

 middle point of the dorsal lip. 



4:19 p.m. : — (Fig. b). Dorsal lip slightly grown downward ; its 

 middle point bent and drawn upward toward the ex-ovate 

 with which it is in direct contact. (Cf. Fig. 69 b). 

 May 6, 8:35 a.m. : — (Fig. c). Area of the segmentation-cavity un- 

 usually small. Blastopore circle still large and acuminated 

 toward the ex-ovate. (Cf. Figs. 69 c and d). 



4:32 p.m. : — (Fig. d). Segmentation-cavity no longer visible. 

 Blastopore circle small, and somewhat triangular in shape, 

 with the apex touching the ex-ovate. Neural plate faintly 

 recognizable. 

 May 7, 9:24 a.m. : — (Fig. c). Blastopore closed ; ex-ovate attached to 

 the point of its closure. Yolk-plug withdrawn. Neural plate 

 distinct. 



4:25 p.m. : — (Fig. /). Medullary groove ready to be closed. Ex- 

 ovate attached to the posterior end of the right medullary fold. 



The results as represented in Fig. 82 are very much as in 



Egg No. 3, as well as in Egg No. 6. 



Egg No. 8. 



Failure. 



Egg No. 9. (Figs. 74 a-f Fig. S3). 



May 5, 1:15 p.m. : — (Fig. a). Punctured at the approximate animal 

 pole, somewhat heavily, as the fluid contents of the segmenta- 

 tion cavity were forcibly ejected at the time. 

 4:23 p.m. :— (Fig. b). Segmentation cavity collapsed ; even a small 

 quantity of yolk substance had been protruded. Dorsal blasto- 

 pore lip growing downward normally. 



May 6, 8:44 a.m. : — (Fig. c). Shrinkage of the upper hemisphere re- 

 covered ; area of the segmentation-cavity disproportionately 



