coe: nemerteans of west and northwest coasts. 285 



Integument and body icalls. — Muscular layers as usual ; base- 

 ment layer well developed ; parenchyma of body cavity of moderate 

 extent. Situated just outside the basement layer of the body walls, 

 and at the very base of the integument, is a continuous layer of pecul- 

 iar cup-shaped structures which are evidently the bases of peculiar 

 integumental glands, and these extend throughout the whole length 

 of the body. They are packed as closely together as possible, and 

 form the same continuous layer from tip of snout to posterior end 

 of body. In sections stained with haematoxylin and orange, they 

 are intensely deep blue, and much darker than nuclei or any of the 

 ordinary glandular secretions. Seen in section each cup-shaped 

 body is seen to rest on the underlying basement layer (PI. 20, tig. 

 128). Each one is U-shaped in section, the free ends lying among 

 the granular integumental cells above. A small nucleus usually 

 appears in some portion of the cup. Seen in a section parallel to 

 the surface of the body, the ciips are circular or irregular in outline 

 and packed together as closely as possible. They are evidently 

 glandular structures of a peculiar nature, for similar glands are 

 found in Amphiporus rubellus and certain other species, but are 

 much less highly developed. 



Cephalic glands are but little developed, although a conspicuous 

 pit is present on the tip of the snout into which the ducts from the 

 glands open. 



Alimentary canal. — The digestive system presents few devia- 

 tions from that of typical species of the genus. The mouth is situ- 

 ated well back from the tip of the snout, and when proboscis is 

 everted in certain states of contraction opens separately from pro- 

 boscis pore. The esophagus is slender as far back as the brain, pos- 

 terior to which it enlarges greatly and enters the stomach, which 

 has its epithelium thrown up into large, irregular, longitudinal folds. 

 The intestinal caeca do not extend far forw^ard — not so far as the 

 nephridiopores. The wide stomach passes into a narrow posterior 

 chamber (pylorus), which extenlls back far beyond the most ante- 

 rior sexual glands before opening into the intestine. The intestinal 

 caecum which lies beneath the pylorus is itself narrow, but it sends 

 off a few pairs of larger diverticula which pass anteriorly in the 

 body parenchyma along the internal faces of the lateral nerves. 

 These diverticula also pass above and sometimes external to the 

 lateral nerves, — that is, nearer the lateral margins. Intestine opens 

 on dorsal side of posterior extremity of body. 



