72 COE 



in the intestinal region, though the natural color of the body has mostly 

 disappeared. A similar, though much less conspicuously marked, me- 

 dian stripe occurs on the dorsal surface. 



The second color variety had chestnut brown intestinal lobes, brown- 

 ish esophagal region, slightly paler below ; snout and margins of head 

 colorless ; brain red. The paler, ventral, median stripe was even more 

 conspicuous than in the other variety. 



Serial sections show that, while the cephalic furrows are unusually 

 long, yet they are not really as deep as in many related species. The 

 brain is very large ; the posterior end of each dorsal ganglion is bi- 

 lobed, the dorsal lobe ending freely, while the ventral lobe continues 

 directly into the cerebral sense organ. The canals from the sense 

 organs open into the very posterior ends of the cephalic furrows. The 

 buccal, or esophagal, nerves are larger than in most species. 



Accessory buccal glands. — On each side of the mouth, and extend- 

 ing a short distance into the esophagal region, is a series of peculiar 

 glands — accessory buccal glands, they may be called. These glands 

 are similar in their nature to, and apparently supplement, the ordinary 

 buccal glands which line the mouth cavity. In the present instance, 

 however, these accessoiy glands lie imbedded in the outer longitudinal 

 muscular layer ventral to the lateral nerves. Here they greatly en- 

 croach upon the domain of the muscles, and occupy a large portion of 

 the space between the circular muscular layer and the cutis (p1. xiii, 

 fig. i). The gland cells are large, and are distended with a clear, 

 granular secretion. These accessory glands appear to have originated 

 from ordinary buccal glands which have passed outward and taken up 

 a position outside the two inner muscular layers (p1. xiii, fig. i). 

 They are arranged in clusters, and discharge their contents by irregular 

 ducts leading through the two inner muscular layers to the epithelium 

 of the buccal cavity and adjacent esophagal wall. A short distance 

 back of the mouth the two lateral series of these accessory buccal 

 glands unite beneath the esophagus, and are not found further poste- 

 riorly. The ordinary buccal glands are present as in related species. 



Alimentary canal. — The esophagus is large in comparison with the 

 thickness of the body wall. The histological difference between the 

 epithelium lining its anterior portion and that of its posterior half is 

 much more marked than in most related species. The delicate layer 

 of circular and longitudinal muscular fibers which surrounds the epi- 

 thelial lining of the esophagus in most of the Heteronemerteans be- 

 comes remarkably developed in this species. At the very posterior 

 end of the esophagus — just anterior to the first intestinal pouches — 



