522 F. W. GAMBLE. 



Section B. — Cotylea. 

 3. Anteriorly-placed marginal tentacles usually present. 

 Mouth just behind (rarely in front of) the brain. Penis with 

 a hard stylet .... Family Euryleptidae. 



a. Brightly coloured. Body thickened over the main 



gut. Tentacles large, moveable. Two small cephalic 

 eye-groups . . Genus Prosthecer^us. 



Species : — Pr. vittatus (body yellow, with longitu- 

 dinal thin black lines). Pr. argus (dorsal surface 

 orange-coloured; length up to 10 mm.). 



b. Dorsal surface usually papillose. Tentacles small. 



Peripheral gut-pores to the exterior 



Genus Cycloporus. 

 Species : — C. papillosus (a median gut-branch over 

 pharyngeal region). 



c. Intestine brightly coloured. Tentacles long. Mouth 



behind brain. Cephalic eye-groups extending far 

 behind brain . , . Genus Eurylepta. 



Species : — E. cornuta (eyes not quite extending back 

 to hinder edge of white pharyngeal region ; body 

 bright red). 



d. Tentacles long. Mouth in front of brain. Pharyn- 



geal sheath with a posterior caecum 



Genus Oligocladus. 



Species : — 0. saw^wiwoZen^MS (body whitish, intestine 



usually carmine; a short cephalic eye-group). 



0. auritus (eyes absent over the brain [Claparcde]). 



e. Tentacles rudimentary. Oral and male genital aper- 



tures united behind brain. A median gut-branch 

 absent over the pharyngeal region 



Genus Stylostomum. 

 Species : — S. variabile (intestinal branches brightly 

 coloured). 



