A. E. Verrill — Marine N'emerteuns of Nero England, etc. 391 



oblong mass ; the posterior end is often the broadest part, but 

 frequently in extension the breadth is nearly uniform throughout 

 most of the length ; posterior end obtuse. Head usually more or 

 less distinctly delined, often broader than the neck, oblong or ovate 

 in form, rounded or obtuse in front, nearly always with a conspicu- 

 ous, pale, angular spot on each side. Ocelli numerous, arranged in 

 two frontal clusters on the white marginal area, and in two dorsal 

 groups ; each of the anterior or frontal ones consists of numerous 

 small ocelli arranged in two or more close rows forming an oblong 

 or crescent shaped cluster close to the antero-lateral margin of the 

 head ; in some cases each of these clusters is double, consisting of a 

 larger, outer or lower group and an upper, smaller one ; but these 

 subordinate clusters are usually more or less blended ; the dorsal 

 groups are smaller and of fewer ocelli, rounded, and situated at the 

 postero-dorsal part of the head, close to the ganglions, and usually 

 on, or just in front of, a narrow whitish line across the neck which 

 marks the position of the transverse fossje. Proboscis large, covered 

 with small papillae. Color of body, above, and middle of head 

 usually deep pui'ple, madder-brown, or purplish brown, sometimes 

 plum-color, chocolate-brown, reddish brown, and orange-brown ; 

 sides and lower surface much paler brown, often flesh-color or 

 pinkish. The head is whitish in front and is almost always con- 

 spicuously marked with two large angular spots or patches of whitisli 

 or flesh-color on the sides above ; most frequently these spots are 

 broad, triangular or trapezoidal, with the apices directed toward the 

 median line above, but separated by a wide dorsal stripe of dark 

 color like that of the body ; in other cases the apices of these spots 

 are more truncated, giving a broad, somewhat squarish form, the 

 shape varying with the extension of the head; a little back of the 

 sjjots a narrow angulated white line, corresponding to the transverse 

 foss;e, crosses the neck, but it is sometimes absent ; in front of the 

 angular spots there is usually another, more conspicuous, white line 

 or narrow band across the dark pigment of the head, but this is 

 sometimes interrupted dorsally and is then represented by a narrow 

 triangular spot of white on each side of the head ; proboscis, when 

 protruded, reddish. 



Length up to 100 to loO"""' ; diameter G to 8'"" or more. 



Massachusetts Bay to Gulf of St. Lawrence, Labrador, Cumber- 

 land Gulf, and Greenland, Very common and of large size at 

 low-water mark, under stones, at Eastport, Me., and Grand Meuan, 

 N. B. I have also dredged it in numerous localities ofi^ Nova Scotia ; 

 in the Bay of Fundy ; off the coast of Maine ; Casco Bay ; off Cape 



