(from Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318)
This gigantic form possesses a body having a diameter far exceeding that of any described species of nemertean.
After preservation for 13 years in alcohol, the body in the intestinal region still measures nearly 45 mm in diameter and is about 10 mm in thickness. Length of body of the single preserved specimen, which is strongly contracted but perfectly complete, 29 cm. General shape of body, much as in E . elizabethae.
Esophageal region cylindrical after preservation, measuring in this specimen 15 mm in average diameter, considerably thicker and broader near the head than toward the intestinal region. Intestinal region strongly flattened, but with rounded edges, widest in its middle portions, narrower near esophageal region, and narrowing gradually towards posterior end, which is, however, remarkably thick and rather sharply truncated. Anal opening terminal, conspicuous, colorless. Intestinal region ringed with numerous deep constrictions. A rather conspicuous, but not sharply demarcated, rounded ridge extends in the median dorsal line along the whole length of intestinal region.
When contracted, as is the single specimen at hand, the intestinal region is much flattened dorso-ventrally, the ventral surface becoming strongly concave and the dorsal surface decidedly convex.
Head comparatively small, short, broad, pointed in front, not marked off from body; proboscis pore terminal. In single specimen specimen at hand the anterior portion of head, or snout, is sharply marked off from the posterior portion by an annular constriction, which is probably wanting in life. Cephalic furrows remarkably short and inconspicuous as compared with the great size of the worm, measuring but 3 mm in length, and extending posteriorly but little farther than the annular constriction which occurs in this specimen behind the snout; they are incompletely separated from the proboscis pore anteriorly. There is also a rather conspicuous vertical groove on the tip of the snout after preservation, so that when viewed directly from the tip of snout seems to be divided into four sections of equal size by the horizontal and vertical grooves, with the proboscis pore at their intersection.
Mouth is of large size, extending forward nearly as far as the posterior ends of the cephalic furrows and nearly to the annular constriction on head. Its length is 9 mm in the specimen.
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