COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 189 



eral margins. Head rather slender, very changeable in shape ; 

 cephalic furrows correspondingly long, extending as far as anterior 

 border of mouth ; ocelli w anting. Caudal cirrus remarkably long. 



Length up to 30 cm. when full grown ; width 3 to t mm. 



Color. — Esophageal region rosy, bright pinkish red, or dull red 

 with tinge of purplish ; head paler ; snout nearly white, shading 

 gradually into reddish color posteriorly; brain region deep pink. 

 Intestinal region deep flesh color or pale reddish, with deeper red 

 dorsal and ventral median longitudinal bands. When sexual prod- 

 ucts are mature intestinal region is yellowish, except in the 

 median line. Proboscis long and slender, cream colored. 



JBody walls. — Cephalic glands diffused and not well developed. 

 Cutis glands limited to a thin layer in the outer fourth of outer 

 longitudinal muscular layer in esophageal region, sinking deeper 

 into the musculature on the approach of th« intestinal region, but 

 little developed as compared with many related species. Accessory 

 buccal glands wanting. 



Inner longitudinal muscular layer remarkably thin, being scarcely 

 one sixth the thickness of outer longitudinal muscular layer in 

 esophageal region. 



Alimentary canal. — Mouth of large size when distended. There 

 is the usual division into esophagus proper and stomach. 



Nepliridkd and blood systems. — The median cephalic lacuna 

 which unites the lateral cephalic lacunae anteriorly is remarkably 

 limited in extent. Lateral vessels and esophageal lacunae as in 

 related species. 



Nephridia unusually extensive, reaching anteriorly into the 

 anterior fourth of esophageal region, and extending posteriorly 

 nearly to the stomach region. A single pair of large canals with 

 numerous branches extend the whole length of the nephridial 

 region and open posteriorly on the dorso-lateral surfaces of the 

 body as usual. 



Sexual products are fully mature in July at San Pedro. The 

 ripe eggs are beautifully clear and fine for study. They measure 

 about 0.125 mm. in diameter. Polar spindles were quickly formed 

 when the eggs were placed in sea-water, and would doubtless have 

 developed by artificial fertilization had any males been secured at 

 the same time as the females. 



Habitat. — Representatives of this species were found only at 



