ALTERNATE PHASES IN FOLLICULINA. 73 



This oblique cone-base then elongated down one side of the 

 cone like a candle that is gutted down one side, but meanwhile 

 the edges of the soft base rose up more and more as walls like 

 the edges of end of a burning candle. The elevated walls were 

 irregular and fantastic at times, with castellated edges. One 

 side was greater than the other and for long one of the lobes 

 which is the left, was greater than the other. But it is not the 

 elongation of the edges of the cone base that makes the lobes, 

 so much, but the actual splitting down of the base internally into 

 right and left halves. That is, the soft end divides more and 

 more to form a deep groove between the tips of the lobes and 

 so the bases of the lobes are produced more and more down into 

 the interior till finally the two lobes are nothing more or less 

 than the right and left halves of the basal third, or more, of the 

 original cone separated from one another by a deep median 

 space. The new adoral zone that is to follow the edges of the 

 arms arises at an early stage and seems to have no connection 

 with any previous formation but to be differentiated de novo 

 from the softened and disorganized terminal and lateral areas. 

 The adoral band starting at one end from within the minor or 

 right arm rudiment, or papilla that is to be its tip, sweeps in a 

 circular arc dorsally and then along the left side central to the 

 rudimental tip of the larger left arm to then pass down the 

 ventral face of the animal where it extends very far toward the 

 apex of the cone. As the animal becomes twisted spirally and 

 has the habit of rotating and of changing the direction of rotation 

 from time to time, it becomes difficult to ascertain how the band 

 is completed, but it is evident that the tip of the band nearest 

 the foot burrows inward into the protoplasm as the future spiral 

 within the peristomal funnel and ultimately acquires a mouth 

 or cytostome at its innermost termination; but in proportion 

 as the two lobes are separated from one another as halves of the 

 animal's body, the two lateral sides of the hypostome curve 

 (Fig. 5) are pulled out as lateral loops that run up and down each 

 arm till the ultimate course of the membranell band is that of 

 two long inverted Us or tuning fork curves connected dorsally 

 by a short dorsal part of the curve, beginning abruptly on the 

 inner face of the base of the right lobe and ending at the opposite 



