COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 163 



body. Cerebral sense organs paler but easily distinguished in life, 

 with conspicuous canals leading to the posterior ends of the cephalic 

 slits. 



Habitat. — Under stones at low water New Metlakahtla, Annette 

 Island, Alaska (Coe, : 01, p. 65). This species, besides being. found 

 in Alaska, is widely distributed in northern waters. On the east 

 coast of America it occurs from Long Island Sound to Greenland, 

 and is found on nearly all the coasts of northern Europe. It has 

 also been recorded from the Mediterranean, though it is there com- 

 paratively rare. It is usually found under stones in muddy situa- 

 tions between tides. 



16. Lineus torquatus Coe. 



Proc. Wash. Acad. Sci., 3, p. 66, PI. 5, figs. 8, 9, 1901 ; Harriman 

 Alaska Expedition, 11, p. 66, 1904. 



PI. 3, fig. 28. 



The following brief diagnosis will serve to distinguish this species, 

 of which a detailed anatomical description appears in the paper 

 cited above : — Body rather stout for genus ; head short, pointed in 

 front, slightly demarcated from body ; cephalic furrows rather short ; 

 ocelli absent ; length commonly 10 to 20 or, rarely, 40 cm. in exten- 

 sion, width 3 to 5 mm. 



Color. — Usually dark reddish brown, chocolate or purj:)le above, 

 sometimes flecked Avith minute, inconspicuous whitish specks ; paler 

 and commonly more reddish beneath (PI. 3, fig. 28) ; a narrow 

 transverse band of white passes across dorsal surface at posterior 

 ends of cephalic furrows ; a white spot is situated on tip of snout 

 and is usually, though not always, connected with transverse white 

 band by w^hite borders to cephaUc furrows. Color of body is 

 retained for many years in alcohol. 



Internal anatomy. — Proboscis slender, of medium size, colorless, 

 internal longitudinal muscles practically wanting ; cephalic glands 

 well developed ; esophageal nerves remarkably large, connected at 

 intervals with the lateral nerve cords ; dorso-median nerve corre- 

 spondingly highly developed ; nephridial canals extend through 

 anterior half of esophageal region, of remarkably large size, some- 

 times equal to lateral nerve cords in diameter, with a single pair of 



