74 



E. A. ANDREWS. 



base of the left lobe as that inner spiral that runs within the 

 animals peristomal funnel to terminate at the cytostome. 



All the complex organizations having been accomplished in 

 usual order, there resulted at 10 P.M., Aug. 29 (Fig. 5) a creature 

 with great powers of extension and with the anterior third of the 

 body split into two very mobile and responsive arms bearing 

 the collecting membranells destined to produce in the water 

 outside the case such powerful currents as rotifers, bryozoa and 

 the close relatives of Folliculina, Stentors, make to bring food 

 particles within control of the selective mechanisms near the 

 mouth. As this individual with its newly formed feeding and 



FIG. 5. FIG. 6. 



FIG. 5. Same at 10 P.M. with fully differentiated lobes, mouth, and feeding 

 apparatus, but with lobes not fully expanded inside closed tube. 



FIG. 6. Same August 30, 6.45 A.M., now dedifferentiated into swimming stage 

 again, with two scars of former attachments to base of sac. 



responsive organs elongated for the first time, as is normal when 

 first reaching out of the tube it had made before possessing such 

 organs, it, in this case of closed up tube, came to a physical 

 resistance that it could not overcome. Very many trials were 

 made in attempts to complete the normal expansion from mouth 

 of tube; sometimes one lobe alone was thrust up into the closed 



