12 Laidlaw, Classification of the Polydad Turbellaria. 



I propose to group the Acotylean genera included in 

 the above table into families as follows : — 



I. Planocerid^. 

 Planocera. 

 Paraplanocera. 

 Disparoplana. 



II. Stylochid^. 

 Stylochinae. 

 Stylochus. 

 Idioplana. 

 Woodworthia. 

 {Eustyloclms). 

 ( Planoceropsis^ . 

 {Shelf or dia ?). 



Stylochocestinse. 



StylocJiocestus. 

 Trigonoporinae. 



Trio^onoporus. 



III. LATOCESTID/E. 



Ace lis. 

 Latocestus. 



IV. Leptoplanid^. 



Stylochoplana. 



Notoplana. 



A lloioplana. 



Plagiotata. 



Hoploplana. 



Planctoplana. 



Leptoplana. 



Phylloplana. 



V. Cryptocelid^. 

 Cryptocelis. 



VI. Cestoplanid^. 

 Cestoplana. 

 Omm.atoplana. 



VII. DlSCOCELID^. 

 Discoceiis. 

 Thalamoplana. 

 Semonia. 



VIII. EnantiiD/E. 

 Enantia. 

 Haploplana 



COTYLEA. 



A sucker behind the female gonopore. Tentacles or 

 tentacle eye-groups, if present, marginal. Vagina without 

 accessory vesicle. 



I. Pharynx sub-central. 



A. Marginal eye-spots present. 



a. Penes numerous, radial, no tentacles. Anonymidce. 



