coe: nemerteans of west and northwest coasts. 173 



Nephridial and blood systems. — Nephridia well developed, 

 extending through more than half the esophageal region, reaching 

 antei'iorly well toward the mouth, and sending large branches 

 among the esophageal lacunae. Usually with a single pair of large 

 efferent ducts situated somewhat anterior to middle of nephridial 

 region and a little in front of middle of esophageal region. 



JSTervovs system and sense organs show few deviations from those 

 of related species. Esophageal nerves unite in broad commissure 

 just in front of mouth. Cephahc furrows are very deep and long. 

 Frontal sense organs well developed ; situated in three well-marked 

 pits near proboscis pore. 



Habitat. — Common at Monterey, California, among kelp 'hold- 

 fasts' attached to stones on sandy or rocky bottom in 2 fms. ; Pacific 

 Grove, California, in crevices of rocks and under stones at low water. 

 Dredged in several localities off San Pedro, California, in 2-20 fms. 



Collected by Mr. A. Agassiz at Mendocino and at Crescent City, 

 California, in 1860. 



21. Lineus albolineatus Coe. 

 Harriman Alaska Expedition, 11, p. 193, PI. 17, fig. 2, 1904. 



PI. 2, fig. 27. 



This species somewhat resembles the variety of Lineus bilineatus 

 figured by Burger ('95, PI. 5, fig. 15) in regard to the markings on 

 the anterior poi'tions of the body, although it shows many anatomi- 

 cal differences, as noted below: — 



Body of moderate proportions for genus, rounded in esophageal 

 region, flattened posteriorly ; head short, broad, commonly a little 

 wider than neck, often slightly emarginate in front, moderately 

 flattened. Cephalic furrows deep, of moderate length, and, in most 

 states of contraction of head, \vell separated anteriorly; when 

 strongly contracted, however, reaching nearly to proboscis pore. 



C'o/or.— General color of body, both above and below, deep 

 chocolate brown or olive brown, Avith a very conspicuous, shar])ly 

 marked, white or very pale yelloAV median dorsal stri])e extending 

 whole length of body, and gradually enlarging on head to form a 

 broad, pear-shaped whitish marking, often two thirds to three fourths 

 as wide as head (PI. 2, fig. 27). jMarking is broadest, and often 

 slightly emarginate, near tip of snout, gradually becoming narrower 



