E. A. ANDREWS. 



the string out at right angles to the tube (Fig. 9), now parallel 

 to the tube length. Within the tube the string was also pulled 

 out long (Fig. 9) but did not break loose either from the dead 

 swollen foot mass nor from the swimming part. It is to be 

 remarked that the ragged base of the free animal had by 10 A.M., 

 that is, in about an hour's time healed over so that it was no 

 longer ragged, oblique, provided with projections and attached 



FIG. ii. FIG 12. 



FIG. ii. Same at 10.40. The strand wound about the tube brings base of 

 swimming part against tube and the swimming form contracts to take on the 

 sedentary phase. 



FIG. 12. Same at 11.40. The free-swimming stage having terminated, the 

 anterior part has secreted a sac attached to old tube; while the posterior part 

 is disintegrated and being eaten by scavengers within the tube. 



by one corner only to the string, but was smoothly finished as a 

 cone with its central part passing smoothly forth (Fig. 9) as the 

 cylindrical slender string of protoplasm which would not break. 

 With the elongation of this strong filament of firm protoplasm, 

 the free animal had more and more wide excursions bound by this 



