PLATE 3 



EXPLANATION OF FIGURES 



12 Section of a specimen (no. 66, table 6) which showed one prominent and 

 one faint white bar, the latter lying in a sector of new tissue constituting one- 

 fourth of the bulk of the animal. A fold of the oral disc (or of the column) 

 appears on the side of the section occupied by the new mesenteries. As in the 

 individual represented in figure 11, less than the typical number of regenerating 

 mesenteries is present on the side of the incomplete bounding mesentery, (I). 

 X45. 



13 Part of a more aboral section of no. 66. Size relations indicate the order 

 of development of the new mesenteries, c- and c^ are usually more nearly equal 

 in size. The new incomplete bounding mesentery (7) appears here though 

 lacking farther orally (fig. 12). X 45. 



14 Section of a triglyphic specimen (no. 63, table 6). Externally there were 

 seen, not quite opposite each other on the oral disc, two white bars lying within 

 the limits of a darker zone forming the greater part of the specimen. On one 

 side was a small lighter colored (newer) sector. There were apparently ten 

 orange stripes of two ages in the older part and beginnings of orange stripes in 

 the newer zone. The most recently formed part, between c and c, shows a typical 

 regeneration following division in two complete endocoels. Two mesenteries on 

 the left of the section between the old bounding mesentery, c, and the pair of 

 directives show a peculiar condition strongly suggesting the position of an old 

 division plane. An anomalous set of four mesenteries is seen at A' (p 205). X 25. 



24S 



