CLASSIFICATION OF POLYCLADIDA 



Classification of Polycladida. 





Family. 



PLANOCERIDAE. 

 With dorsal tentacles 

 Mouth sub-central. 



LEPTOPLANIDAE. 

 Without dorsal tenta- 

 cles. Penis directed 

 backwards. 



CESTOPLANIDAE. 

 No tentacles. Body 

 elongated. Penis 

 directed forwards. 



ENANTIIDAE. 

 No sucker. No tentacles. 

 Main-gut very short. 

 External apertures as 

 in Euryleptidae, 



ACOTYLEA. 



Genus. 



Planocera (Fig. 8, A). 

 Imagine. 

 Conoceros. 

 Stylochus. 



Stylochoplana(Fig.S,E). I 

 Diplonchus. \ 



Planctoplana. 



British Representatives. 



/ Planocera folium Grube. 

 Berwick-on-Tweed. 



-| Stylochoplana maculata 

 Quatref. Among brown 

 weeds in Laminarian zone. 



Discocelis. 

 Cryptocelis. 

 Leptoplana. 

 Trigonoporus. 

 iPolypostia (see p. 27). 



Cestoplana (Fig. , C). 

 In Mediterranean and 

 on French side of the 

 Channel. 



Enantia. 

 Adriatic Sea. 



f Leptoplana tremellans O. F. 



MOIL 



L.fallax Quatref. Plymouth. 

 L. drocbachensis Oe. Ply- 

 mouth Sound. 



L. atomata O. F. Mull. 

 L Doubtful species. 



No] 

 ;wo | 



COTYLEA. 



Anonymus (Fig. 8, D). 

 Naples (two specimens). 



ANONYMIDAE. 

 Mouth central, 

 tentacles. With two 

 rows of penes. 



PSEUDOCEKIDAE. 



Marginal tentacles , p , 

 folded. Mouth inl P **%" r S - 

 anterior half. I Yun 9- 



represented *>^ S2Zk 



sent and pointed, 

 represented by 



E^Eio 

 Pharynx cylindrical 



PROSTHIOSTOMATIDAE. 

 Tentacles absent. Body 



elongated. Pharynx | Prosthiostomum (Fig. 

 long, cylindrical. 

 Penis witli accessory 

 muscular vesicles. 



/ Prostheceraeus vittatus Mont. 



On west coast. 



| P. argus Quatref. Guernsey. 

 I Cycloporus papillosus Lang. 



On Ascidians in 2-30 fms. 



/ EuryleptacornutaO. F. Mull. 



, On sponges and shells, 



j 2-10 fms. 



I Oligocladus sanyuinolcntus 



Quatref. 



0. auritus Ckp. Doubtful. 

 N Stylostomum variaoile Lang. 





