256 F. W. GAMBLE, B.SC. 



Species: — M. striatum (pigment carmine, reticular; muscles 

 grouped in longifcidinal bundles). 

 8. With two genital apertures, two germaria, and two vitellaria. 

 An otolith present .... Family Monotidse. 



a. Female genital pore in front of the male - Genus Monotus. 

 Species : — M. lineatus (an eye present in front of the otolith ; 



copulatory organ a soft papilla). M. fuscus (copulatory 

 organ a chitinous tube). M. albus (penis, a boat-shaped, 

 chitinous copulatory organ with a pair of lateral teeth near 

 the "bows"). 



b. Female genital pore behind the male aperture 



Genus Automolos. 

 Species: — A. ophiocephalus (an eye usually present in front 

 of the otolith ; head expanded). A. unipunctatus (an eye 

 absent ; penis a spinous tube). A. horridus (head slightly 

 marked off from the body ; rhabdites giving a spinous 

 appearance to the animal ; penis soft, muscular). 



II. TRICLADIDA, 



A single (rarely double) genital aperture behind the mouth. Pharynx 

 central or post-central ----- Family Planariidae. 



a. Penis directed dorso-ventrally. Uterus opens into genital 



atrium. Head truncate. Eyes wide apart Genus Gunda. 

 Species: — G. ulvce (the angles of the anterior margin produced 

 into "lappets"). 



b. Head produced in the centre. Eyes approximated 



Genus Fovia. 

 Species : — F. affinis (pharynx behind the middle). 



III. POLYCLADIDA. 



Section A. — Acotylea. 



1, Dorsal contractile tentacles present. Tentacular, cephalic, and 



marginal groups of eyes - - - Family Planoceridae. 



a. Body leaf-like. Marginal eyes absent - Genus Planocera. 



Species : — PL folium (tentacles placed behind commencement 



of second quarter of length ; body yellow-brown). 



