Vol. IV. December, 1902. No. i. 



BIOLOGICAL BULLETIN. 



NOTES ON THE REGENERATION OF GONIONEMA. 



G. T. HARGITT. 



The experiments of which this paper presents a resume were 

 conducted at the Marine Biological Laboratory during the sum- 

 mer of 1901. The purpose in view was such a review of pre- 

 vious work done by C. W. Hargitt '97,* '99, 2 and by Morgan '99, 3 

 as would confirm or correct, or possibly extend, the conclusions 

 then announced. 



The work was suggested by and the experiments carried on 

 under the direction of C. W. Hargitt, whose advice and over- 

 sight has been largely instrumental in making possible the 

 preparation of this paper. 



By way of introduction it may be stated that three general 

 series of experiments were projected : 



I. Experiments upon the regeneration of the marginal organs 

 of the medusae. 



II. Experiments on the regeneration of the manubrium. 



III. Experiments upon the regeneration of the radial canals. 

 Under each of these series several sets of experiments were 



conducted, and under each set a sufficient number of specimens 

 operated upon to insure reasonable precautions against failure or 

 unwarranted conclusions from limited observations. In other 

 words the repeated experiments operated as controls or checks 

 against exceptional results in either direction. 



In general the methods followed were similar to those of 

 previous experiments. The medusas were operated upon very 

 soon after being brought into the laboratory, being cut into 

 desired forms by means of clean scissors as the animals were 



1 Zoological Bulletin, Vol. I., p. 27. 



2 BIOLOGICAL BULLETIN, Vol. I., p. 35. 



3 The American Naturalist, Vol. XXXIII., p. 939. 



I 



