COE: NEMERTEANS OF WEST AND NORTHWEST COASTS. 211 



and is but a little wider posteriorly than near attachment of stylet 

 (fig. 107). Length of basis in two individuals 0.15 mm. and 0.165 

 ram. Stylets are sharp and acutely pointed, but are rather broad at 

 the base (fig. 108). They are a trifie shorter than the basis. The 

 proboscis is provided with 16 nerves. 



Cephalic glands are voluminous, filling up a large portion of the 

 tissues of the snout. Submuscular glands well developed and of 

 large size. They extend back through esophageal region, where 

 they are situated mainly ventral to lateral margins of body, and 

 extend inward practically through the whole layer of longitudinal 

 muscles to the connective tissue about the lateral nerves and blood 

 vessels. 



Alimentary canal. — A pair of very narrow diverticula of the 

 intestinal caecum extend forward well toward brain region. They 

 lie above lateral borders of esophagus. A considerable distance 

 posteriorly they become united into the broad, unpaired caecum 

 which lies beneath the esophagus, as in E. bilrgeri. 



Blood and nephridtal si/stenis. — The l)lood vessels of the head 

 are peculiar in that they do not appear as thin-walled lacunae, but 

 always show distinct fibrous walls, and exhibit in a striking manner 

 the epithelial cells Avith which the vessels are lined. Their arrange- 

 ment is as in related species. 



Nephridial tubules are voluminous and are limited to a short dis- 

 tance immediately behind brain. 



Cerebral sense organs are, as in E. btlrgeri, remarkably large for 

 genus. They are much elongated and extend fiom a point well 

 towards the tip of snout back nearly to brain region. 



Habitat. — Adakh Island (Aleutian group), Alaska, two complete 

 specimens fully 25 cm. in length. Collected by the Albatross, July 

 2, 1893. 



In general appearance, shape of body, color, and in many points 

 of internal anatomy, the species resembles E. bilrgeri from southern 

 Alaska and Puget Sound. In other anatomical features, and notably 

 in armature of proboscis and in number of proboscis nerves, the two 

 species differ widely. E. bilrgeri has both stylets and basis of cen- 

 tral stylet much swollen and has only 11 proboscidial nerves, while 

 the present species has fluted stylets, not swollen at base, basis of 

 stylet is not swollen posteriorly, and there are 16 proboscidial 

 nerves. 



