214 c - M - CHILD. 



7. Occasionally an cesophageal piece closes aborally by union 

 of the body-wall across the end of the oesophagus. In these 

 cases communication between the oesophagus and enteron is 

 established, the piece becomes fully distended, and regeneration 

 proceeds in the typical manner. 



8. The difference in regeneration between the " closed " and 

 "open" cesophageal pieces is undoubtedly due to the difference 

 in the degree of internal water-pressure. 



HULL ZOOLOGICAL LABORATORY, 



UNIVERSITY OF CHICAGO, November, 1903. 



BIBLIOGRAPHY. 

 Child, C. M. 



'02 Studies on Regulation, I. Fission and Regulation in Stenostoma. Arch. f. 

 Entwickelungsmech. , Bd. XV., H. 2, 1902. 



'03 Studies on Regulation, II. Experimental Control of Form- Regulation in 

 Zooids and Pieces of Stenostoma. Arch. f. Entwickelungsmech., Bd. XV., 

 H. 4, 1903. 



'033 Form-Regulation in Cerianthus, I. The Typical Course of Regeneration. 

 Biol. Bull., Vol. V., No. 5, 1903. 



'O3b Form-Regulation in Cerianthus, II. The Effect of Form, Position, Size, 

 and Other Factors upon Regeneration. Biol. Bull., Vol. V., No. 6, Vol. 

 VI., No. I, 1903. 



*O4a Form-Regulation in Cerianthus, III. The Initiation of Regeneration. 

 Biol. Bull., Vol. VI., No. 2, 1904. 



'O4b Form Regulation in Cerianthus, IV. The Role of Water- Pressure in 

 Regeneration. Biol. Bull., Vol. VI., No. 6, 1904. 



'040 Form-Regulation in Cerianthus, V. The Role of Water-Pressure in 

 Regeneration : Further Experiments. Biol. Bull., Vol. VII., No. 3, 1904. 



