GLYCERA PROFUNDI. 351 



The body is widest at about the eighteenth setigerous segment from where 

 it narrows continuously caudad. The body is nearly cylindrical, a little less 

 convex ventrally than dorsally. The greatest width of the type, exclusive of 

 parapodia, is 4.5 mm.; including parapodia and setae, 8.5 mm. 



The prostomium consists of the usual broad basal portion, which is strongly 

 transversely wrinkled, and the slender subcorneal smooth portion. The basal 

 portion is proportionately short. The conical process is somewhat compressed 

 dorsoventrally, is marked by a distinct median longitudinal furrow both above and 

 below, and is divided transversely into eight or nine rings. (Plate 64, fig. 2). 



All segments are very short, and the anterior ones especially are closely 

 crowded at widest region, being eight or nine times wider than long. All seg- 

 ments are conspicuously triannulate. The annuH are all equal in length, or, 

 in the anterior region, the median, parapodia-bearing, one of each somite is 

 somewhat wider laterally than the others. 



The notocirri are inserted on the sides of the body above bases of the para- 

 podia. They are very small, whitish, cyUndrical papillae, which are absent from 

 the first two setigerous segments. The first two parapodia, or properly, the 

 neuropodia, are situated high on the body at the sides of the mouth. They 

 are small. The first two parapodia lack neurocirri; they are small and sub- 

 conical, presenting a flattened, distally rounded, apical lip, which is slightly 

 notched but not divided. The immediately succeeding parapodia show a sUght, 

 rounded postsetal hp and a large presetal lip divided into a much stouter and 

 shorter, basally thick, ventral division acuminate at tip, and a more slender, 

 pointed dorsal lobe. The neurocirrus, attached to the middle of the ventral 

 surface and not reaching .the end of the neuropodium by a considerable distance, 

 is present and is thick at base and strongly pointed distally. (Plate 64, fig. 3). 

 In proceeding caudad the parapodia become longer and proportionately more 

 slender and cylindrical. The dorsal presetal lobe becomes transformed into an 

 unbranched gill, being thin and elongate, with the foliaceous base reduced in 

 relative size, but not or but little exceeding the ventral division, which becomes 

 of more uniform width and not especially thickened proximally. The dorsal 

 ligulate gill is attached on the dorsal surface near the distal end of the para- 

 podium, and is suberect. The neurocirrus is developed into a ventral gill similar 

 in structure, appearance, and size to the dorsal one, which does not reach the 

 tip of the postsetal lobe. (Plate 64, fig. 4, 6). 



Acicula pale yellowish, transparent, two in number, of which the ventral 

 is much the stouter. The setae of the parapodia, excepting first two, as usual, 



