l8 COE 



enlarged to form a small oval spot. The second transverse marking is 

 situated some 20 to 30 mm. (in large individuals) from the first, and 

 completely encircles the body. This ring is always sharp and con- 

 spicuous, and in alcoholic specimens is still more distinct in that it 

 separates a paler anterior portion from the much darker succeeding 

 parts. The third transverse ring is also complete, and is commonly 

 separated from the second by about half the distance that this is separated 

 from the first. The fourth and fifth rings are sometimes interrupted 

 below, but are more usually complete, and are much nearer together 

 than the second and third. Back of the fourth or fifth ring we find a 

 regular succession of complete rings to the end of the body. It is 

 common to find as many as 200 such rings arranged at fairly regular 

 intervals and separated from each other, when the worm is contracted, 

 by an average distance of about the diameter of the body. Some of 

 the rings are wider than others, but nearly all are as narrow as fine 

 threads ; a few are more or less interrupted. 



The anterior and lateral margins of the head are bordered by a nar- 

 row band of light color, as in several other species, but this is mainly 

 visible from the ventral surface. 



The 'side organs' are indicated by a pair of small pits situated in 

 the third transverse white ring and just dorsal to the position of the 

 lateral lines. Their position is about the same, therefore, as in C. 

 super ba. 



In alcoholic specimens the arrangement of the white longitudinal 

 and circular lines is still distinguishable, except near the anterior 

 end of the body, which, back to the second transverse marking 

 (first complete ring), is pale or grayish brown. Back of this the 

 color abruptly changes to very dark brown or black, which reaches 

 posteriorly 50 to 75 mm. (in large individuals) and then gradually 

 fades out into light brown, which continues to the end of the body. 

 The color is usually paler on the ventral than on the dorsal sur- 

 face. 



Habitat. This species was found in abundance under stones near 

 low-water mark at Orca and Virgin Bay in Prince William Sound, but 

 was not met with elsewhere. The worms lived in long, fragile, gray- 

 ish, paper-like tubes of about the same diameter as the body. These 

 tubes were usually twisted about horizontally beneath the stones under 

 which the animals live. They were also frequently occupied by a 

 species of polychaetous annelid {Nereis), which was often associated 

 with the Nemertean. The worms are sluggish in their movements, 

 and break up posteriorly if roughly handled. 



