EXPERIMENTAL FISH EMBRYOLOGY 



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Fig. 

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1. Dorsal and lateral views of a Kundulus after hiatchlng revealing the shortening 



of the head with orbital formation following ablation of the eye at stages 

 21-23. 



2. Stage 27 embryo showing the recovery and healing of an embryo after the removal 



of the eye in Stage 22. Indications of the future mouth and Iiead asymmetry 

 are already evident. 



3. The healing after operation at Stage 22 shows a puckering of the opercular 



region following the removal of fin tissue. The embryo Is slightly bent toward 

 the side of operation. 



4. The removal of the fin in Stages 20-22 gives rise always to the t>Tpe of animal 



here shown at the time of hatching. 



5. The ear was removed in its early vesicle stage, Stage 20. At the time of opera- 



tion slight damage was done to the right half of the brain which is reduced in 

 size. The C curvature is .characteristic of the posture of the earless forms. 



The operation performed at Stage 17 Involved a slight injury to the mld-braln 

 and the constrictions made by the pipette are still evident at Stage 25 anterior 

 and posterior to the original site of Injury. 



The result obtained by an injury to the anterior part of the medulla; the circu- 

 lar region shows a deficit extending to the notocord which was slightly en- 

 larged. There is no reconst itution. Operation performed at Stage 18. 



Development without repair after injury to the left side of the brain. Opera- 

 tion performed at Stage 18. 

 9. The free portion of the tall bud of a stage 20-embryo was removed. The wound 

 healed and was covered with epidermis. The rounded eminence is a notochordal 

 projection covered with epithelium. Embryo Stage 25. 



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^From Nicholaa & Oppenheimer 19i;2 : Jour. Exp. Zool. 90:127) 



