COE : NEMERTEANS OF WEST AND NOETHWEST COASTS. 97 



Hetekonemertea. 



A. Proboscis musculature of two layers, of which the outer is circular ; 



muscular crosses absent in proboscis; cephalic glands usually very 



voluminous, extending posteriorly behind brain ; cephalic furrows 



absent Taeniosoma, p. 15-i. 



1. Body of very large size, sometimes 2 meters or more in length and 



18 mm. in diameter; color deep yellow, thickly sprinkled with 

 small, irregular, dark red dots . . T. princeps, p. 156. 



2. Body large, soft, flabby, -10 to 60 cm. in length; color deep red, 



mahogany, or reddish brown, sometimes covered with whitish 

 bloom; head with broad spot of darker color and terminal bor- 

 der of white; ventral surface of same general color, but paler, 

 except ventral side of head which is whitish. T. punnefti, p. 158. 



3. Body of modej-ate diameter, but of great length, often much exceed- 



ing a meter, somewhat flattened; color brown, with a great number 

 of narrow rings of whitish encircling the body. 



T. mexicana, p. 157. 



AA. Proboscis musculature of two or three layers, of which the outer 



is longitudinal; muscular crosses present in proboscis; cephalic 



glands usually but little developed, and not extending posterior to 



brain . . . . . . . . . . B. 



B. Without horizontal cephalic furrows on sides of head; caudal cirnis 

 present . . .... Zygeupolia, p. 160. 



1. Body slender, 5 to 10 cm. in length; head acutely pointed; 

 cephalic furrows absent, the canal from each cerebral sense 

 organ opening into a snuill pit on side of head; caudal cirrus 

 conspicuous, whitish in color; general color of body whitish 

 or flesh color, becoming yellowish, rosy, or pale brown in 

 intestinal region and pure white on head. Z. littoralis, p. 160. 

 BB. With conspicuous horizontal cephalic furrows on sides of head. C. 

 C. Caudal cirrus absent; proboscis sheath usually considerably shorter 

 than body . . . . . . . . . D. 



D. Body remarkably thick a^nd massive, usually nearly cylindrical 

 when fully extended, but very broad and much flattened in 

 intestinal region when strongly contracted; ocelli wanting; 

 muscular layers of body possess a reddish tinge. 



Euborlasia, p. 175. 

 1. Body of gigantic size for a worm, with a greater diameter 

 than in any other described species of nemertean, becom- 

 ing 45 mm. wide in intestinal region; color dark lirown, 

 perhaps with an olive tinge; head paler, with brown 

 mottlings . . . . . E. maxima, p. 175. 



