PLANARIA FELINA. 73 



terior angle formed by the body, or rather 

 between the bodies of the other, was more 

 acute. The relation of the generating 

 parts, nevertheless, always gained greater 

 uniformity with the general outline and fi- 

 gure of a planaria in the natural state. As 

 their dimensions continued to enlarge, their 

 action became more lively and distinct, and 

 soon corresponded with the external pro- 

 perties of an entire unmutilated animal. 



A head thus protruding from the left side 

 of a planaria artificially rendered monstrous, 

 is represented, according to its real incre- 

 ment on the tenth of December, or about 

 six weeks after the operation, Fig. 10. Its 

 growth, it is true, continued long after- 

 wards, and until very nearly equalling the 

 size of its fellow ; but the apprehension of 

 accident, to which the tender substance of 

 such creatures is so much exposed, induced 

 me to obtain this premature delineation. 



It is therefore proved beyond controver- 

 sy, that an incision in the side of the plana- 

 ria felina, executed in a particular manner, 



