NEMERTEANS 139 



laterally. Below the lateral margin it is quite narrow, and continues 

 ventrally as a thin line which joins the one from the other side just at 

 the posterior border of the mouth. This dark nuchal band is bordered 

 posteriorly by a distinct white band of about the same diameter (pi. 

 xiv, figs. 2-4). 



On the ground color of the body are four longitudinal white bands, 

 extending with more or less distinctness throughout the length of the 

 body. These are situated symmetrically, two very near the lateral 

 margins of body, and the other two dividing the dorsal surface into 

 three equal parts. The lines all terminate anteriorly in the first white 

 ring, situated just behind the dark nuchal band mentioned above. 

 Anteriorly the lines are narrow, but on the approach to the intestinal 

 region, broaden out very irregularly. Those on the dorsal surface en- 

 croach so greatly on the general brown ground color as to limit it to a 

 narrow, brown, median dorsal stripe, and two other narrow brown 

 stripes on lateral margins. The two lateral lines come to lie ventrally 

 to the lateral margins, and become so wide as to occupy almost the 

 whole ventral surface the brown color being largely replaced by the 

 brownish white of the longitudinal bands. This may be true of the 

 worms only at the time when the sexual products are mature, for the 

 pouches of reproductive elements are light in color and partially obscure 

 the brown color of body. At other seasons the white lines would 

 doubtless appear narrower, and the brown color of intestinal region 

 would be more pronounced. 



The body is divided transversely into unequal segments by a series 

 of narrow white rings, situated at irregular intervals from the head to 

 the posterior end of the body, as in C. sttperba. Most of these white 

 rings are very narrow, but are rendered more conspicuous by being 

 bordered, sometimes on both sides, and sometimes only on one, by fine 

 brown rings which are continuous with the general ground color, but 

 of a darker hue. These brown rings are often more conspicuous than 

 the narrow white ring beside them, so that some of the annular mark- 

 ings appear dark, rather than lighter in color (pi. xiv, figs. 2-4) . The 

 brown rings pass through and interrupt the longitudinal pale bands. 

 The color of the white markings, especially the longitudinal ones, ap- 

 pears to be superficial and applied in small, confluent spots, and not 

 homogeneously. 



The segment included between the first and second and that between 

 the second and third white rings are each fully twice as great as any 

 other segments. The rings are otherwise fairly regular in position, but 

 are often interrupted or wanting on ventral surface. Prof. C. B. Wilson, 



