128 COE 



tudinal and inner circular layer, with muscular crossings. 



Caudal cirrus present Zygeupolia. 



I. Rather slender, 5 to 8 cm. in length; head pure white, 

 acutely pointed ; esophageal region whitish, pale yellow 

 or flesh color ; intestinal region rose, pale yellow, light 

 brown or chocolate brown from color of intestinal canal. 

 Caudal cirrus slender, white. No retractor muscle to 



proboscis Z. littoralis, p. 177. 



AAA. Head with deep, horizontal furrows. Proboscis of three 

 muscular layers, outer longitudinal, circular, and inner 

 longitudinal layers, or of the two former only; muscular 

 crossings usually present. 



a. Caudal cirrus absent. Body long and slender, rounded or 

 flattened; very contractile Lineus. 



1. Slender, small, usually 10 to 15 mm. long. A single 



row of two to four (rarely six to eight) irregular 

 ocelli on each antero-lateral margin of head. Pink or 

 rosy flesh color, sometimes with tinge of blue ; deep 

 flesh color to purplish brown in intestinal region; 

 head white L. rubescens, p. 179. 



2. Up to 12 cm. in length; usually three to seven irregu- 



larly fragmented ocelli on each side of snout. Yellow, 

 sometimes with decided tinge of orange, deep ochre or 

 pale yellow L.flavescens, p. 184. 



3. Large, soft and flabby, up to 50 cm. in length ; cephalic 



furrows remarkably long. Ocelli wanting. Dark 

 brown of various shades of color, velvety ; a series of 

 narrow, pale yellow rings, expanded to diamond-shaped 

 spots on dorsal surface, usually encircle body, but may 

 be very inconspicuous. Dorsal surface usually corru- 

 gated longitudinally with series of very delicate, in- 

 conspicuous, longitudinal yellow lines. Tip of snout 

 white, usually with two small orange-colored spots 

 situated in an area of pale yellow on dorsal surface. 



L. pictifrons, p. 188. 



4. Length loto 15 cm. or more; head broad; ocelli want- 



ing. Dark brown with conspicuous median dorsal 

 white or light yellowish stripe which expands on head 

 to form a broad, pear-shaped marking. Usually a 

 faint reddish line extends along each lateral margin of 

 body Z. albolineatus, p. 193. 



