coe: nemerteans of west and northwest coasts. 267 



of the whole length of the body of the worm when contracted. 

 When cleared in cedar oil or other clearing agent, the basis is dark 

 in color and distinctly visible to the unaided eye. In form it is 

 somewhat irregularly conical, and is three or four times as long 

 as its greatest width. It is broadest posteriorly, with a rounded or 

 somewhat truncated base, and tapers very gradually and fairly 

 evenly to the attachment of the stylet (Text-fig. 55). 



Central stylet very small in proportion to size of basis, being less 

 than one third its length, and sometimes little more than one fourth 

 as long, or about as long as the width of the basis. The stylet is 

 broad and conical, and is blunt rather than sharply pointed (PI. 24, 

 fig. 193; PI. 25, fig. 200). There are two pouches of accessory 

 stylets, each containing 1, 2 or 3 short, conical stylets, precisely simi- 

 lar in size and shape to the central stylet. The posterior third or 

 half of basis is dark and granular, while the anterior portion is clear 

 and homogeneous. 



Measurements of the armature of 3 specimens are as follows : 



Length of basis. AA^idtli of basis. Length of central stylet. 



1. 0.8.5 mm. 0.25 mm. 0.25 mm. 



2. O.SO nun. 0.20 mm. 0.25 mm. 

 :3. 1.02 mm. 0.30 mm. 0.28 mm. 



Nos. 1 and 2 are from Cape Smyth and No. 3 from Wainwright 

 Inlet, Alaska. Comparative sizes of two of these are shown in Text- 

 fig. 55. In one specimen, one of the two lateral pouches contained 

 but a single stylet, which was fully formed, but was no larger than 

 any of the three stylets in the other pouch. 



Ilahitat. — Collected by the Point Barrow Expedition in the 

 Autumn of 1882 in 2^ fms. near Cape Smyth, Alaska. This locality 

 is in Lat. 71° 10', and is far up in the Arctic Ocean, and near the 

 most northern point of laud in Alaska. Collected also at Wain- 

 wright Inlet (Lat. 70° 35'), Alaska, in 9 fms., gravel and sandy bot- 

 tom^, by W. H. Dall. 



The species resembles A. arcticus Punnett (: 01, p. 94 ) in the size 

 of proboscis and number of jjroboscidial nerves. It is impossible to 

 determine, however, the relationship of the two species because the 

 single specimen from Davis Strait on which Punnett bases his 

 description had the armature of the proboscis dissolved out before 

 the specimen came into his hands. 



