144 VARIATION IN THE NUMBER OF STRIPES 



CONCLUSIONS. 



1. Longitudinal division is very common in Sagartia lucise and may take place in 

 a few hours. 



2. Multiplication by basal fragmentation is also probably common in nature. 



3. Pieces made by artificial cuts regenerate new individuals. A piece without 

 tentacles will produce a normal individual with tentacles in from five to seven days. 



4. The regenerated tissue is easily recognizable on account of its lighter color. 



5. By longitudinal division the stripes are apportioned to the two daughter 

 individuals. 



6. As a study of the frequency curve of the stripes shows (Fig. 15), 8-4 is a com- 

 mon apportionment of the stripes, as is likewise 5-7 and 9-3. 



7. The condition of 0, 1, or 2 stripes is much less common and is the result of 

 rapid and repeated division correlated with slow regeneration of stripes at least. 



8. Stripes are brought to the new individual on the old tissue and are produced 

 anew on the regenerated tissue. 



9. The old stripes are broader and are of a deep orange color. The new stripes 

 are narrower and are at first of a lemon-yellow color. 



10. When regeneration is most vigorous, the more numerous are the new stripes 

 produced. 



11. The new stripes may appear early in the regenerated tissue, and in such 

 numbers as to lie between each pair of mesenteries. 



12. The new stripes may delay appearance in the regenerated tissue until many 

 mesenteries are formed, and then they tend to develop between the primary mesen- 

 teries only. 



13. Twelve stripes and forty-eight mesenteries is the most common condition. 



14. When division is delayed for an unusual length of time more than forty-eight 

 mesenteries and twelve stripes occur, but this condition obtains only in a small pro- 

 portion of the individuals. 



15. Triglyphic forms occur and are apt to possess more than twelve stripes. 



16. Division may occur before the state of twelve stripes is attained. 



17. The individuals are always tending by means of regeneration in the direction 

 of twelve stripes and forty-eight mesenteries. 



18. By division of the twelve-striped condition or by division before the twelve- 

 striped condition is attained, the mass of the individuals fall short of twelve stripes. 



