PLANARIA GRAMINEA. 123 



Soon after, the sexual union took place, 

 during which the two animals, adhering by 

 their tails to the upper part of the glass, 

 performed a singular conjoint revolution, 

 resembling the spokes of a wheel. Similar 

 gyrations are occasionally exhibited by them 

 singly in the water. The eggs, now visi- 

 ble by the naked eye, appeared in various 

 stages of maturity, and in greater number; 

 they were still ranged on one side of the 

 smaller planaria, and some which had re- 

 cently been near the opposite extremity, 

 rose so high as to approach within a third 

 of the snout. 



Subsequent remarks established, that the 

 animal, in assuming different positions, can 

 bring other eggs than those at first most 

 conspicuous into view ; and it even seems 

 endowed with the faculty of altering their 

 place in its body. Instead of the regular 

 arrangement preserved in an early stage, 

 they gradually became more confused, se- 

 parating, as it were, into detached groups 

 and clusters ; and on the eighteenth of Oc- 



