Manchester Memoirs, Vol. xlviii. (1903), No. 4. ii 



y. Prostate absent. Plancioplana ('92). 



b. No nuchal tentacles, no marginal eye-spots. Penis 

 small conical. 



1. Vesicula seminalis normal. Leptoplana}' 



2. Vesicula seminalis paired, prostate reduced. 



Phylloplana (:03^). 



B. Pharynx sub-central, no tentacles, marginal eye-spots 



present. Penis and prostate very large. Cryptocelis. 



C. Pharynx behind the centre of the body, a penis sheath 



present, no tentacle eye-groups. Penis small. 



a. Body very long, no accessory vesicle. Cestoplana. 



b. Body- rounded, accessory vesicle present, dorsal surface 



with numerous papillae. Ommatoplana (:03). 



Dorsal surface smooth (penis sheath ?). 



Microcelis ('99). 

 III. No internal prostate glands. 



A. Pharynx sub-central, no nuchal tentacles, marginal eyes 



present, penis large, blunt and without a stylet. 



1. External prostatic glands developed on the walls of 



the antrum masculinum. 



a. A common genital atrium. Discocelis. 



b. Genital apertures distinct. Thalamoplanc^ . 



2. No external prostatic glands, a common genital 



, atrium. Semonia ('96). 



B. Pharynx in the anterior half of the body, no nuchal 



tentacles, no marginal eye-spots. The penis which 

 lies close behind the pharynx is a rounded vesicular 

 body, opening through a minute antrum to the 

 exterior. 

 I. Pharynx large, folded, a vesicula seminalis present, 

 four uterine openings into the vagina. 



Enantia ('89). 



2,, Pharynx of a very simple type, no vesicula seminalis 



present, only one pair of uterine openings into 



the vagina. Haplopland (:03^). 



^ See note D. 



^ See footnote, p. 5, 



" See note E. 



