12 COE 



folymorfha in external appearance, but is more brightly colored, and 

 shows conspicuous peculiarities in its internal anatomy. The body is 

 even softer than that of C. folymorpha^ and more distensible ; and the 

 species is easily distinguished by the presence of enormously developed 

 cephalic glands, by having very highly specialized and sharply defined 

 cerebral sense organs (with ciliated canal, lined with glandular and 

 sensory cells), by the peculiarities in the nephridia, and by many other 

 details of structure. 



Head rounded in front, broader than parts immediately following, 

 from which it is marked off by lateral, transverse furrows. Proboscis 

 opening and mouth as in other species of the genus. Body variable in 

 thickness in its different portions according to state of contraction of 

 the particular part, but usually flattened below and rounded above, 

 with well-rounded lateral faces ; posterior portion of body much more 

 slender than anterior. 



The worms are very sluggish. When coiled together the turns of 

 the body are irregular and angular. 



Color. — This is the most brilliantly colored and unquestionably the 

 most striking Nemertean encountered on the expedition. The color of 

 the whole body was a deep, rich vermilion, becoming somewhat paler 

 and more yellowish towards the posterior end. In formalin or alcohol 

 the natural color quickly disappears, although a characteristic marking 

 still remains. This feature is peculiar to C. polymorpka as well. 

 About 25 to 40 mm. back from the tip of the head (in a large speci- 

 men) is a broad band of dark brown color reaching entirely around 

 the body. This band is commonly 10 to 30 mm. in width, is very 

 sharply marked off anteriorly, but fades out gradually behind. All 

 the rest of the body, both in front and behind, is yellowish or grayish. 

 This marking remains after imbedding in paraffin, and even after 

 sectioning and staining in hsematoxylin there is a sharp line of distinc- 

 tion at the anterior end of the dark band. A single section, cut 

 obliquely, shows the line of demarkation perfectly. The difference 

 lies wholly in the integument and does not affect any of the layers 

 beneath. In the integument the dark band is characterized not only 

 by the presence of an abundance of minute pigment granules, but by a 

 decided change in the staining qualities of the closely packed gland 

 cells. 



Size. — The body is very long, one specimen measuring — when sus- 

 pended by its middle portion, and therefore well extended — fully three 

 meters in length, and about 5 mm. in width. Most specimens, how- 

 ever, were not more than 5^ as long. 



