E. A. AND.REWS. 



In making lobes the old adoral band of membranells sank down 

 into the interior and was apparently entirely melted away during 

 a remarkable loss of organization of all the terminal region of the 

 body accompanied by especial internal circulation of the now very 

 fluid endoplasm, rapid currents passing dorsally from the foot 

 end up to the peristomal end, across that end and down again to 

 the foot ventrally to complete a circuit. The appearances sug- 



FIG. 3. FIG. 4. 



FIG. 3. Same at 12.30 swimming in vain attempts to get out. 



FIG. 4. Same at 4 P.M. again attached by new base inside case and with new 

 lobes differentiating. A stage like that in Fig. i but going toward differentiation 

 and not the reverse. 



gest that the usually well organized and rather rigid anterior end 

 of the animal as well as much of the interior rather suddenly 

 breaks down into a fluid state as if a solid were melted, or a 

 gell changed to sol, and then this begins to rotate violently from 

 unknown causes. The animal now is a cone of stiffer ectosarc 

 with ciliated lengthwise bands and subjacent myonemes attached 

 at end, which is tip of cone, while the base of cone is oblique and 

 liquid out to a mere superficial pellicle, apparently (Fig. 4). 

 This oblique soft face has lost all myonemes and cilia as well as 

 the former rigid adoral band of membranells and the pigment 

 patch. 



