TABLE 11 



This table shows the number of mesenteries reaching the esophagus in individuals 

 represented in tables 3 to 6 upon completion of the recorded regeneration. Speci- 

 mens are distributed according to the number of siphonoglyphs and the number 

 of complete mesenteries. The figures in the body of the table represent numbers 

 of specimens. Average numbers of mesenteries are given for each siphonoglyphic 

 class and for the whole. The triglyphic specimen with nineteen complete mesen- 

 teries had five directives, one lacking a mate. 



Monoglyphic 



Diglyphic 



Triglyphic. . . 

 Tetraglyphic 



Totals 



AVERAGE 

 MESENTERIES 



11.3 

 15.0 

 20.5 

 24 



15.8 



TABLE 12 



This table is taken, with some modification, from Carlgren's table ('09, p. 40) sum- 

 marizing the results of his study of regenerating anemones at stages when the order 

 of development of the mesenteries could be determined. 



Roman numerals at the head of different columns represent the types of arrange- 

 ment indicated by corresponding numerals in figiire 35. In the horizontal rows 

 are indicated the number of cases of each type found in regenerating pieces of 

 different kinds. 



Carlgren used, in this study, artifically cut pieces of Sagartia viduata; natural 

 fragments of Metridium dianthus, and pieces similar in character artificially 

 separated from the parent polyp; and naturally produced basal fragments of 

 Aiptasia diaphana. Some pieces of Sagartia and Metridium were cut in such 

 a way as to leave only basal tissue to form the new polyp. These are designated 

 as 'basal pieces.' 



In all of the ten cases of Type VIII in Sagartia the new directive plane is perpendicu- 

 lar to the plane passing through the middle of the piece before regeneration. In at 

 least some of these specimens (and I presume in all, since otherwise the relation 

 of the neiv directive plane to the old middle plane could probably not be determined) 

 some old tissue was present, on one side, between the mesenteries I have desig- 

 nated as c^ and c'. 



The single example of Type II in Aiptasia shows a second esophagus. 



Type VIII is the one found by Cary in three species of Aiptasia and in 'Cylista 

 leucolena' (?). 



Regenerating specimens of S. luciae, when old complete bounding mesenteries are 

 absent, are of Type III, V, or II. 



{Sagartia 

 Metridium, natural — 

 Metridium, artificial.. 

 Aiptasia 



T, , • fSagartia 



Basal pieces <,,° . ,. 



i^ Metridium 



242 



