NOTES ON COELOPLANA BOCKI n. sp. 



5*3 



takes to swimming much less frequently than before, but remains most 

 of the time on the bottom, where it begins to creep about, using the 

 above indicated pharyngeal surface as the sole. In still four or five 

 hours, most of the cilia of comb-plates become either bent or broken off 

 in the middle, and finally fall away altogether. The larva is then 

 entirely incapable of swimming, and the creeping by means of the sole 

 becomes the only way of locomotion. The pigments increase in the 

 parenchyme ; the tentacle- stem develops some ten branches ; the sole 

 flatly spreads out all around, while the inner end of the pharynx 

 develops a few folds on the wall (" pharyngeal folds "). 



Fig 5 



Fig. 5. A larva during metamorphosis, adhering to the substratum by the 

 thinly spread-out sole. The main body laid back and seen 

 on the transverse plane. x 170. 

 pli.f. Pharyngeal folds. Other letterings as in Fig. 4. 



After two or three hours more, the adherent larva is at an advanced 

 stige of metamorphosis. By that time the combs have completely fallen 

 off, and the sole has extensively enlarged in all directions, flattening 



