260 Papers from the Department of Marine Biology. 



ventral cirrus of the fifteenth is similar to that of the second. There is a 

 single row of veiy stout setae and there are aciculae in both noto- and neuro- 

 podia. This general form of parapodium is continued to the end of the body, 

 though the anterior and posterior lips of the parapodia become more nearly 

 equal, so that the organ when viewed from above has a bifurcated appearance. 

 The nephridial papillae are cylindrical and very prominent. 



The setae are essentially alike throughout the body, differing only in the 

 relative size of the different parts. Each has a stout shaft (plate 1, figs. 15 

 and 16), widening toward the end but narrowing to a pointed apex and with 

 a sharp subterminal tooth. On their dorsally directed surfaces each has a 

 series of alternately arranged plates with their free ends finely toothed. The 

 setae of the dorsal part of the setae bundle have more numerous plates than 

 ventrally, the middle ones being intermediate as regards this character. 



One of the two specimens showed an indication of a brown color over the 

 head and bases of the antennae. Somites 2 and 3 were uncolored. From 

 somite 5 to somite 20 the dorsum has a brown band, due to transverse markings 

 in each somite; these are shorter than the somite diameter, so that the margins 

 of the somites above the parapodia appear uncolored, but somites 6, 8, 12, 14, 

 and 20 are uncolored, thus forming interruptions in this band. Behind 

 somite 20 the markings occur only in the elytra-bearing somites. 



Collected in the Dry Tortugas in 1914. 



Type and cotype in the American Museum of Natural History. 



Harmothoe variegata n. sp. 



The type specimen was collected at the Dry Tortugas in 1909. I also have 

 specimens collected at St. Augustine, Florida, and loaned to me by Professor 

 Verrill. 



The type is 26 mm. long and 5 mm. wide in its widest part, near the middle; 

 from here it tapers toward both ends, but more noticeably so posteriorly than 

 anteriorly. There are 39 somites, and 15 pairs of elytra. 



The most striking part of the coloration of the alcoholic specimens is formed 

 by the marking of the elytra. The inner and posterior margin of each elytron 

 is marked with a dark line, which in the inner posterior quadrant is continued 

 as a pigment patch, of a slightly lighter shade than the margin, to reach the 

 elytrophore attachment (plate 1, fig. 17). When the elytra are in place the 

 general effect is that of a broad median dark band on each elytron, the lateral 

 posterior quadrant of each lighter-colored, but surrounded by a narrow mar- 

 ginal band. The remainder of the dorsal surface is uncolored, except that at 

 the beginning of the posterior quadrant prominent black spots appear on the 

 base and apex of some parapodia, usually only on elytra-bearing somites. 

 Approximately the last 10 somites have a median dorsal pigment patch and 

 6 are uncovered by elytra. 



Ventrally the margins of the mouth are pigmented, the pigmentation con- 

 tinuing on eithe ' side as a single patch at the base of each parapodium, toward 

 the posterior end extending so as to cover a large part of the ventral surface. 



The head is only slightly rounded, a little longer than broad, the anterior 

 notch very narrow (plate 1, fig. 18). Peaks of head very slightly marked off 

 from the ceratophores of the lateral tentacles, the latter about one-quarter 

 as long as the head and densely pigmented. The terminal joint of the tentacle 

 is slender, its entire length not more than twice that of the ceratophore, its 

 tip filiform. The basal half of this temiinal joint is pigmented, the terminal 

 half being also colored, but not so deeply as the basal; apex uncolored. The 

 median tentacle had been lost, but its ceratophore is large, overlapping the 

 lateral ones, pigmented at its end. Palps rather stout, about 3 times as long 



