80 TURBELLARIA. 



Tribe I. Cryptoccela. 



Eurylepta (Ehrenb.). No frontal notch; no 

 warts on the body ; one sessile group of eyes on 

 the neck ; two frontal tentacles. 



E. vittata. Fig. 124 ; n. s. 

 cornuta. 



Leptoplana (Ehr.). No notch, warts, nor ten- 

 tacles ; eyes in four groups. 



L. tremellaris. Fig. 125 ; n. s., and head magnified. 

 atomata. 



Tribe IT. Dendroccela. 



Planaria (Mtiller). Body oblong; two eyes or 

 series of many eyes near the front ; branches of 

 intestines undivided, egg-shaped ; mouth opening 

 at or a little behind the middle. 



P. flexilis. Fig. 126 ; n. s. 

 1 stagnalis. 

 ? hirudo. 



Tribe III. Rhabdoccela. 

 Convoluta (Oersted.) Body oblong-ovate, obtuse 



