io6 LEWIS : 



chambers were not very deep, not much over half the depth of 

 the body ; the lappets were not very large, and the conjoined, 

 external lobes did not rise much above the mouth line. It 

 was a symmetrical as well as transparent species. Once seen, 

 it could ever after be readil}' recognized. 



Whilst this species was under my observation, I had 

 removed a large and active individual by dipping it up with a 

 tumbler to bring it nearer to my eye. Along with it was a 

 small and disintegrating one, which happened to be taken up 

 also, and upon this specimen my attention was concentrated. 

 At the end of one of its broken and dissolving lines of flap- 

 pers appeared a spiral of motion, continuing for half an hour 

 or more, when it broke away and floated off, apparently a 

 complete organism, rotating on its own axis in a horizontal 

 direction and keeping up its constant, ciliary motion. Very 

 soon a second spiral, 7vithout cilia, floated off, and like the 

 other, apparently began an independent existence, but instead 

 of rotating on its own axis in a horizontal, it revolved in a 

 vertical direction, and was nearly twice as large as the cili- 

 ated body. In this smooth, plate-like spiral there were two 

 white specks, symmetrically placed one above, the other below 

 the point of union or umbone of the spiral. Of course I 

 cannot assert that these white specks were nerve masses. I 

 can only say they looked like it, and suggest further inquiry. 

 It may be conjectured that these spirals, which looked and 

 behaved like independent beings, were merely parts of a dis- 

 solving animal still retaining motile power. Parts which 

 break off do frecjuently present that phenomenon. But other 

 sjjirals, several in number, succeeded these already mentioned, 

 and from their appearance I am strongly inclined to believe 

 this an instance of genuine fissaporous multiplication, and 

 that the young in this species may be evolved from the same 

 tracts which in other species give rise to eggs. 



My attention was partly diverted from these extremely 

 interesting objects by discovering that the large individual in 

 the tunil)l(,'r iiitt-ndt'd to feed on the smaller and dissolving 



