goe: nemerteans of west and noethwest coasts. 275 



posteriorly than near anterior end (PL 1, figs. 11, 12) ; much like A. 

 angulatus in shape. Length 25 mm. or more, ^\ddth at least 3 mm. 

 After preservation body is usually swollen and truncate anteriorly ; 

 smaller and more flattened in intestinal region. 



Color. — Deep llesh color, pale orange, or pale red ; much paler 

 and usually grayish beneath (PI. 1, figs. 11, 12). 



Ocelli. — Two groups of oceUi on each side, situated deep among 

 the cephalic tissues and arranged such as in A. angulatus ; usually 

 6 to 10 moderately large ocelli in each group. 



Proboscis of very large size, provided with 14 nerves; armature 

 was unfortunately destroyed by preserving fluid liefore examination. 



Cephalic glands voluminous. A few submuscular glands lie near 

 lateral margins of body in brain region, but do not extend far poste- 

 riorl3^ 



Basement layer very thick. A large amount of parenchyma lies 

 between the bundles of longitudinal muscles and separates the body 

 organs mdely. Few other species have a greater development of 

 the body parenchyma. Peculiar cup-shaped glands are present in 

 basal portion of integument, as in Drepanophorus ritteri (p. 285). 



Alimentary canal. — Esophagus presents two distinct chambers 

 well differentiated anatomically and histologically, and situated one 

 above the other, much as is described above for A. occidentalis 

 (p. 272). The ventral branch — esophageal caecum — is directly 

 continuous ^nth esophagus, and is Uned with typical esophageal epi- 

 thelium. It continues as a narroAv tube as far as the posterior end 

 of the nephridial region, where it ends blindly. A similar structure 

 occurs also in A. bimacidatus, A. marmoratus, and A. arcticns (see 

 p. 274). The broad dorsal chamber, or stomach, opens from the 

 dorsal wall of esophagus a short distance behind the brain, and 

 passes backward directly beneath the proboscis sheath and above 

 the esophageal caecum. Posterior to the end of this latter, the 

 stomach continues above and between the intestinal caeca as a 

 much narrower tul>e, or pylorus, which much farther back opens 

 into dorsal wall of intestine as usual. The stomach is lined with 

 comparatively short, ciliated and glandular cells, which are charac- 

 teristic of this organ in other species of the genus. 



The most anterior diverticula of the intestinal caeciim do not 

 extend forward quite so far as to reach the posterior end of the 

 esophageal caecum. In this respect the present species differs from 



