II NINETEENTH REPORT. 



A furtlier i)oint of interest is that we have liere a meristic variation 

 occurring in a non-metameric animal belonging to the group which by 

 common consent is regarded as ancestral to the metameric worms. 



Zoological Laboratory, 



^lichigan State Normal College, Ypsilanti. 



LEGENDS. 



Plate I. Figure 1. Photomicrograph of the anterior end of a |)laMarian with 



supernumerary ocellus. 



Figure 2. Drawing explanatory of Fig.l. (X 60.) 



