ASEXUAL REPRODUCTION IN SAGARTIA 233 



GENERAL EXPLANATION OF TABLES 3 TO 8 



Mesenteric formulas of regenerated polyps are here represented in tabular 

 form, but in a manner which has to some extent the significance of a diagram. 

 In the first column of each table are given numbers designating different indi- 

 viduals or groups of related individuals. Letters in this column refer to different 

 regenerating animals derived from a single anemone by fission. In the columns 

 included under 'old mesenteries' are indicated the complete mesenteries and 

 incomplete bounding mesenteries of the old part which persist without obvious 

 change. Similarly, under 'new mesenteries' are represented mesenteries of the 

 region formed after division. In all cases where regeneration is sufficiently 

 advanced to give conclusive evidence of the final formula of the regenerated 

 region, this is given in detail, except that definitively incomplete mesenteries are 

 represented in the formulas only when they occur as bounding mesenteries. In 

 cases of earlier stages only the number of new mesenteries present is indicated. 

 The formula of each individual at the time it was killed is given between two 

 adjacent horizontal lines. With the exception of a few complicated cases, 

 specially explained in connection with table 5, the arrangement of complete 

 mesenteries in any specimen whose mesenteric formula is given in detail can be 

 readily pictured if, reading from left to right, one imagines the indicated mesen- 

 teries distributed in pairs around the body of the anemone with the last of the 

 new mesenteries adjacent to the first of the old ones. Thus figure 9 shows a 

 cross-section of a specimen having the same arrangement of complete mesenteries 

 (disregarding the distinction between old and recently regenerated parts) as 

 represented in the formula of no. 7b (table 3) after regeneration. Similarly, 

 figure 18 may serve to illustrate the arrangement of complete mesenteries of 

 no. 7a after regeneration, and figures 19 and 21 of no. 7 before division. 



In the following three columns are given respectively the number of mesen- 

 teries in the regenerated region actually reaching the esophagus at the time of 

 killing, the number of days during which regeneration had proceeded, and the 

 numbers of the illustrative figures. Specimens represented in tables 3 to 6 may 

 be fairly regarded as constituting a small random sample of the specimens found 

 near Woods Hole, Massachusetts (pp. 170,171). Those represented in tables 7 

 and 8 may not be so considered, but are useful as showing further instances of 

 regeneration following division of the types they represent. 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 28, NO. 



