NEMERTEANS 131 



I 



On the anterior third of body these longitudinal lines are situated 

 directly in the yellow ground color, but in the intestinal region the 

 median line is separated from the rose-colored ground color of the 

 mature females by an irregular border of sage green thickly flecked 

 with whitish dots. This sage green color probably represents the gen- 

 eral ground color of the worms when the sexual products are absent ; 

 while the rose color, which seems to make up the general color of the 

 dorsal surface of intestinal region, is due to the thickly-placed sacs of 

 ova, which are of a pale rose color. In some regions these rose-colored 

 spots are separated by a continuous green ground color, as shown in 

 fig. 5, pi. xv. 



The transverse markings are very numerous and are of various 

 widths from the first two bands, which are more than half as wide as 

 the body, down to the finest possible lines. Many are extremely fine, 

 and many others incomplete. As a rule, the wider bands are separated 

 by one or two much finer ones, and seldom, or never, are two of the 

 wider bands immediately adjoining. The first transverse marking 

 borders the extreme tip of head and is narrow and barely visible both 

 on ventral and on dorsal surface. It extends laterally from end of 

 median longitudinal line about halfway to the posterior border of head. 

 The second transverse marking occurs on the neck just back of the 

 lateral furrows which separate the head from the body. This mark- 

 ing is broad and shield-shaped on dorsal surface, but is narrower 

 laterally, while on the ventral surface it is interrupted by the mouth, 

 which lies exactly in the region which would be occupied by the band 

 if it were continued. The first band is about half as wide as body. 

 The second is separated from the first by a distance about equal to 

 twice the diameter of body, and is a little broader than the first on the 

 dorsal surface. It forms a continuous band around the whole body, 

 but on ventral surface it is not much more than half as broad as on 

 median dorsal surface. The third band is separated from the second 

 by a distance less than that between the first and second, and is some- 

 what narrower than either of these. The fourth is separated from the 

 third by a greater distance than in any other case ; it is as broad as the 

 second, and is as wide ventrally as on the dorsal surface. The fifth is 

 very narrow, the sixth broad, seventh narrow, eighth broad. Then 

 come two imperfect narrow bands, and then a fairly broad one, and so 

 on, through the remainder of the body, with a broad band usually fol- 

 lowed by one or two narrow or imperfect ones. An individual meas- 

 uring 50 cm. in length shows from seventy to one hundred of these 

 transverse bands. In general the bands decrease in width toward the 



