BY J. J. FLETCHER, M.A., B.SC. ' 249 



fragments which were developing new heads by its larger cheese- 

 cutter-shaped portion, its more intensely pigmented upper surface, 

 and the two black patches just behind the head formed by the 

 fusion of the most anterior portions of the lateral stripes. The 

 autei'ior portion of the first specimen was wanting, and was pro- 

 bably one of the dead portions. Thus such of the fragments as 

 had not too recently separated, had acquired fairly well-developed 

 new cheese -cutter-shaped heads in about thirty days ; whether 

 in each case a new mouth and genital orifice had also formed was 

 not apparent. A third specimen kept for several weeks main- 

 tained its bodily integrity. 



