84 THE ANNELIDA POLYCHAETA. 



The dorsum is matted with much entangled foreign matter which wholly 

 conceals the surface, the foreign material including even fragments of coral 

 in addition to the finer material. The ventral surface presents numerous minute 

 tubercles or points. 



The parapodia are long and cylindroconical, the narrowing distad being 

 very gradual. (Plate 10, fig. 8). 



The ventral setae are dark brown in color. They are long, projecting 

 between two and three millimeters beyond the tip of the parapodia. The 

 principal setae curve decidedly toward their distal ends. Each is distally 

 bifurcate as in such forms as P. chrysocoma (Claparede) and P. sericoma Ehlers, 

 though differing in detail of form. The principal branch is curved with its 

 concavity toward the minor branch or tooth and in a direction opposite to the 

 principal curvature of the seta. The lesser tooth is straight and projects at a 

 wide angle. The most ventral in the series are much more slender than the 

 most dorsal ones. In addition to these there are in some of the more anterior 

 neuropodia numerous much finer setae. These are paler in color. They vary 

 much in stoutness among themselves in each fascicle. They may be curved 

 much as those of the principal type above described; but instead of a single 

 subapical tooth they present a series of small teeth below a naked tip. The 

 series of teeth may be short, much as in the ventral setae prevaiUng throughout 

 in P. maggiae Augener, except that the teeth in that form are fewer and shorter; 

 but more commonly a series of teeth may extend on both sides of the setae to 

 the middle or below, or the series on one side may be longer than on the other. 

 Thus these setae are typically bipectinate. (Plate 10, fig. 3-7; Plate 11, fig. 2). 



The dorsal setae are arranged as usual and are numerous and conspicuous. 

 They vary in length, the shorter ones curving close to the dorsum and by their 

 uncinate tips aiding the finer dorsal hairs in holding much foreign material. 

 The setae in general increase much in length caudally, some of those on the 

 posterior somites being ten millimeters in length. They all widen from the 

 base distad to the middle region and then narrow into a long, slenderly acuminate, 

 distal region which is apically conspicuously curved or uncinate. Each seta 

 appears more or less flattened and grooved along one side. The edges are wholly 

 smooth. The dorsal hairs are fine and smooth. 



Locality. Gulf of Mexico: Sta. 2370 (lat. 29° 18' 15" N., long. 85° 32' 

 W.). Depth 25 fms. Bottom of coarse gray sand and broken shell. 7 Febru- 

 ary, 1885. Two specimens. 



The specimens had unfortunately been at some time dry, the hardening 



