W. It, Coe — New Palceonemer leans. 519 



Length, more than 250™"^. (Esophagal region about 6"^°^ in diam- 

 eter ; intestinal region 10""°^ wide by 4"^°^ in thickness. Color, bright 

 orange. The mucus secreted by the integument is excessively tena- 

 cious. 



Living in sand at low water. Wood's Holl, Mass., 1894. The 

 genital products are mature in August. 



This species, described from two incomplete specimens, presents 

 a very striking appearance on account of its large size and its 

 gorgeous orange color. A complete animal, judging from the 

 fragments obtained, would probably measure at least two feet in 

 length. 



Integument much as in Gerehratulus. The cutis is not provided 

 with an underlying layer of anastomosing radial fibres and, conse- 

 quently, its longitudinal muscles are not distinctly separated from the 

 outer longitudinal muscular layer of the body-wall into which the 

 tubular glands of the cutis extend. In the intestinal region the 

 cutis is thin, and the epithelial musculature is well developed. The 

 muscles of the body-wall consist of three principal layers, as in Gere- 

 hratulus, although the inner longitudinal layer exceeds the circular 

 layer in thickness. The dorso-ventral muscles are rather poorly 

 developed. 



The proboscis-sheath is provided with a strong muscular wall in the 

 anterior oesophagal region, but is thin and delicate farther back. 

 At the attachment of the proboscis, just in front of the brain, the 

 rhynchodseum makes a sharp turn and opens to the exterior on the 

 ventral side, near the tip of the head. The proboscis-sheath is pro- 

 vided with an inner layer of longitudinal, and an outer layer of circu- 

 lar muscles. The endothelium rests on a very thick basement mem- 

 brane of gelatinous connective tissue. 



The musculature of the proboscis at its anterior end is made up 

 almost entirely of longitudinal fibres. Farther back a circular layer 

 arises, which divides the longitudinal muscles into a thin outer and 

 a thick inner layer. The columnar, ciliated cells of the epithelium 

 are separated from the muscles by a thin basement membrane. The 

 epithelium is thrown up into slender papillae, more conspicuous 

 towards the posterior end of the proboscis. A layer of connective 

 tissue of considerable thickness lies between the outer endothelium 

 and the muscles. At a point about one-third the length of the pro- 

 boscis from its posterior end the muscular layers become very thin. 

 Back of this point the inner longitudinal layer disappears while the 



