COE: NEMERTEANS OF WEST AND NOKTHWEST COASTS. 165 



A most striking peculiarity of tlie color in esophageal region is 

 that it becomes purplish or bluish after preservation in formaUn. 

 The bluish color is not permanent, however, but disappears in a few 

 weeks. But when such specimens are cleared in cedar oil, a delicate 

 bluish or bluish green color reappears in esophageal region, while 

 intestinal region remains colorless or slightl}' brownish. 



Ocelli. — Two to four, or rarely as many as six to eight, ocelli on 

 each side, irregular in shape, very dark reddish or almost black in 

 color, are closely placed in a single row in whitish area on tip of 

 head. Anterior ocellus on each side usually the largest, but the 

 •ocelli are often irregularly joined together, appearing rather as a 

 row of scattered pigment masses on each side. In microscopic sec- 

 tions the eyes appear deep blue in color. 



(Jephalic glands extensive, reaching inward almost to the blood 

 lacunae in anterior portions of head ; not extending behind brain 

 except on ventral side, where they reach as far as posterior ends 

 of cerebral sense organs. 



Cutis glands remarkably well developed. Back of moiith they 

 sink gradually through the cutis and deeper into the external longi- 

 tudinal muscular layer. Farther back the glands reach inward to 

 the circular muscle except in the vicinity of the lateral nerves. 

 Throughout intestinal region they border the whole surface of the 

 circular muscles, except near the lateral nerves. 



Proboscis. — Proboscis sheath remarkably long for genus, extend- 

 ing nearly to posterior extremity of body. Circular and outer lon- 

 gitudinal musculature of proboscis of the usual proportions ; inner 

 longitudinal muscles represented only by two bands placed symmet- 

 rically on opposite sides of proboscis. These two longitudinal bands 

 are of considerable thickness anteriorly, but gradually disappear 

 farther back, allowing the internal epithelium to border the circu- 

 lar muscles without interruption except from the nervous layer. 

 Proboscis nerves well developed^ anteriorly, spreading out into a 

 plexus farther back. 



Esophagus presents well marked division into esophagus proper 

 and stomach. The former is lined with highly columnar, ciliated 

 epithelium and provided with an abundance of glands. The cili- 

 ated cells are situated superficially and their nuclei are not far 

 removed from the surface, while the glandular cells lie mainly at a 

 lower level and have their nuclei farther from the surface. The 



