38 PLA.NARIA PANNICULATA. 



so dark, as in some individuals to approach 

 to black ; and on accurate examination, it 

 proves to arise from short black lines in a 

 lighter ground. Many of these planariaa are 

 distinguished by one or more large irregu- 

 lar patches of white, either above or below, 

 and at times traversing the entire sub- 

 stance to both surfaces. This, however, is 

 not a universal characteristic, and when at 

 either extremity, may readily be taken, by 

 inexperienced observers, for regenerating 

 parts. A broad dark line below, apparent- 

 ly denoting the site of an intestine, pro- 

 ceeds from the origin of the head to the se- 

 cond ventral pore, which, as well as that 

 above it, is extremely conspicuous; but, as 

 has already been stated with respect to the 

 preceding species, neither orifice is equally 

 displayed at every season. The verge of 

 the anterior extremity is environed by a 

 row of most minute black specks, or eyes, 

 scarce discernible by a magnifier of mode- 

 rate power. One of the planariae having 

 pccurred with the patch so situated as to 



