40 COE 



pairs of efferent ducts, all of which open in the immediate vicinity of 

 the lateral nerves. In one series of sections a small efferent duct from 

 one of the branches above the lateral nerve was followed only two sec- 

 tions farther back by a similar, though larger, duct from a branch below 

 the lateral nerve on the same side. The nephridia end posteriorly near 

 the point where the esophagus opens into the intestine. 



Sub-muscular glands of limited number lie between the muscula- 

 ture and the intestine and proboscis sheath. These glands are closely 

 packed together in the head in front of the brain ; back of this point 

 they become widely scattered, although they do not cease entirely until 

 back of the esophagal region. 



A short intestinal caecum with a few wide lateral diverticula extends 

 forward beneath the esophagus. This caecum is shorter than in most 

 species of the genus, and does not reach nearly to the brain. The 

 esophagus also is short and opens directly into the dorsal wall of the 

 intestine. 



A pair of large blood lacunae occupies the anterior portion of the head 

 as usual. 



The lateral nerves and longitudinal blood vessels join above the pos- 

 terior end of the alimentary canal, as in most species. 



Reproductive glands in both male and female are very numerous, 

 and are situated both above and below the intestine. They open di- 

 rectly to the surface, as could be determined from their rudimentary 

 ducts, although the sexual products were very immature in June and July. 

 Habitat. — This species is conspicuous because of its clear, rosy or 

 flesh-like color, which is all the more striking in contrast with the black 

 mud in which it is usually found. It occurs between tides in muddy 

 locations over a large portion of the southern Alaska coast. It was 

 collected at Taku Harbor, Sitka, Yakutat, Prince William Sound, and 

 Popof Island, although only a few were found at each locality. Usually 

 but one or two specimens were found in several hours' digging. 



AMPHIPORUS Ehrenberg. 

 Symbolae Physicae, Berlin, 1831. 



This is by far the most common genus on the Alaska coast, and to it 

 belong six of the thirty species of Nemerteans collected. 



The genus Afnphiporus includes mostly rather stout, solid, often 

 flattened forms, usually of considerable size, which are capable of an 

 almost incredible amount of extension and contraction. A few forms, 

 however, are long and cylindrical, even when contracted, but others 



