COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 295 



Some are very pale yellow anteriorly with gray intestinal tract and 

 pale yellow brain ; others are pure white anteriorly with flesh col- 

 ored or pale orange intestinal canal ; in others intestinal canal is pale 

 brownish. Mature ova are pale rose, and their presence gives a cor- 

 responding tone to intestinal region of ripe females. Males are 

 whitish in a corresponding region. Intestinal caeca reach anteriorly 

 as far as brain. A tine line of dark pigment sometimes occurs be- 

 tween the ocelli of the same side. 



Ocelli. — In life anterior pair of ocelli are rather more widely 

 separated fi'om posterior pair than are the two ocelli of the same 

 side; of medium size; sometimes anterior pair is slightly the 

 larger, sometimes the posterior. They are often irregular in shape 

 with root-like processes of pigment extending on all sides, but this 

 is especially marked between the ocelli of the posterior pair (PI. 17, 

 fig. 104; PI. 22, fig. 145). After preservation the four ocelli all lie 

 anterior to the lateral grooves (PI. 22, fig. 146), but in life their 

 relative position as regards the grooves depends upon the state of 

 contraction of the parts. 



Proboscis. — Proboscis sheath does not reach posterior end of 

 body, but terminates in its posterior third. In this respect the 

 species differs from nearly all other described forms of the genus. 

 In one of several specimens sectioned, the proboscis sheath was bent 

 sharply on itself and terminated some distance anterior to its most 

 posterior portion. A section through this region in this particular 

 individual consequently shows two sections of the proboscis sheath 

 (PI. 9, fig. 62). 



Proboscis sheath corpuscles pale yellow. Proboscis of compara- 

 tively large size, with slender central stylet, and slender basis, usually 

 3 to 4 times as long as thick, and usually somewhat longer than 

 stylet itself (PL 17, fig. 105). Basis is sometimes symmetrical and 

 largest posteriorly, but more often somewhat irregular and larger a 

 short distance behind insertion of stylet (PI. 22, figs. 147-149) than 

 near the posterior end. Two lateral pouches each contain 2 to 4 

 (usually 8) slender accessory stylets. Basis of small size, as shown 

 by the following measurements : Length .04 to .055 mm. ; width 

 .012 to .02 mm. ; stylet .035 to .05 mm. long. Proboscis nerves are 

 ten in number as usual. 



Alimentary canal. — Intestinal caeca extend forward to posterior 

 side of dorsal brain lobes. The slender posterior portion of the 



