218 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Body extremely long and filiform, being more slender than in any 

 other species of nemertean found on the coast except Cephalo- 

 THRix. Body commonly 10 to 15 cm. or more in length, and 

 usually less than 1 mm. in breadth ; head slightly broader than 

 body, which is somewhat flattened dorso-ventrally, but of nearly 

 equal width throughout its length. 



Color. — Dorsal surface dull whitish with a tinge of brown, or 

 sometimes decidedly brownish, with two narrow longitudinal bands 

 of deep brown extending throughout the length of the body. Each 

 of these brown bands is perhaps one eighth as broad as the body. 

 They lie near the median dorsal line, and are separated from each 

 other by about twice the width of either band. On the head they 

 lie just internal to the eyes, and do not extend quite to the tip of 

 snout (PL 11, tig. 7o). They are sharply marked off from the much 

 paler color between them, but show a tendency to shade off laterally 

 into the general pale brownish color of the dorsal surface. Toward 

 the lateral margins the brownish color becomes very pale and grad- 

 ually shades off into the whitish, grayish, or pale Hesh color which 

 characterizes the ventral surface. 



Ocelli. — Four eyes of large size are arranged to form the corners 

 of a square (PI. 11, fig. 73). 



Cephalic glands.— Enormously developed cephalic glands occupy 

 the greater portion of the head and stretch far back into body, 

 extending even as far back as the most anterior sexual pouches. In 

 the esophageal region these glands often occupy more space than the 

 prol)Oscis sheath and esoi)hagus together, and fill up the space 

 usually taken by the body parenchyma, Avliich in this species is very 

 much reduced. 



Proboscis. — Proboscis sheath not much more than one third as 

 long as body ; proboscis provided with eight large nerves which 

 reach back to the stylet a])paratus ; the muscular and epithelial 

 layers are as in Amfhiporus. Central stylet of proboscis slender, 

 provided with an elongated, slender basis, measuring about 0.12 

 mm. in length by 0.02 mm. in average diameter. Basis is peculiar 

 in being of nearly the same diameter throughout, and not swollen 

 posteriorly (PI. 11, fig. 74). Shape of basis alone will readily serve 

 to distinguish the })resent species from N'. peronea., which has a 

 short, conical basis. Each of the two lateral pouches usually con- 

 tains from four to six slender stylets. In the specimens preserved 



