438 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM [1885. 



large as the ventral, with the setigerous lobe and the superior ligula 

 nearly equal in size and both lanceolate ; the ventral ligula is shorter, 

 more flattened, and lanceolate in form, with a tapering tij). The dorsal 

 fascicle of sette becomes very small and inconspicuous, posteriorly. 

 The parapodia on the segments close to the end become much smaller. 

 The last segment is small, rounded, papilliform, and has a small, central 

 orifice ; in the living specimens it bore two small caudal cirri. 



The proboscis is large and clavate when exserted, with the surface 

 nearly smooth, but showing minute granules under a lens. Around the 

 orifice there is a circle of a larger, soft, blunt papillae ; within these is 

 a ring of minute, black denticles, mostly two-lobed at the tip, and a 

 much larger jaw on each side, terminating in five sharp, recurved, un- 

 equal denticles. These jaws are surrounded at the base by a special 

 circle of soft papillae. 



Color of the specimens, in alcohol, dark brownish olive, becoming 

 somewhat glaucous blue on the segments, and with a somewhat lustrous 

 surface. The lower surface is more yellowish, with the median groove 

 and transverse lines, corresponding to the segments and intervals be- 

 tween them, glaucous blue. In life the surface has a brilliant metallic 

 luster. 



The first and much the largest specimen was taken in the evening in 

 the harbor of Newport, R. I., swimming at the surface, by Master 

 Willie trray, August, 1880. This specimen was 20 inches in length and 

 nearly one-half an inch in greatest breadth. 



Polydora tubifex Verrill, sp. nov. 



Tentacles very long and slender, of nearly uniform breadth through- 

 out, but slightly tapered, the edges crenulated. Head with the central 

 lobe narrow, i>rominent, in the usual state emarginate or bilobed an- 

 teriorly, with the lobes short and rounded ; posteriorly extending back 

 on the first segment to a blunt point. Eyes four, nearly in a transverse 

 line, the outer ones a little farther forward, often with an additional 

 small black spot on each side. Lateral lobes of the head (or buccal seg- 

 ment) large, thick, and swollen, laterally and beneath. Four anterior 

 segments with short appendages and i^apilliform dorsal cirri, and with 

 long capillary setse; fifth segment with a small upper fascicle of slender, 

 capillary setse and a lower one of rather small and slender spines ; 

 sixth segment with short appendages; on the seventh, the branchiae com- 

 mence as short, flat, blunt, rounded organs, strongly ciliated; farther 

 back they become longer, ligulate, scarcely tapered, or sometimes even 

 broadest distally, in length equal to about half the breadth of the body ; 

 they extend to near the tail. Caudal appendage small, consisting of 

 four short, blunt lobes ; the lower ones slightly prolonged ventrally. 



Color pale yellow or salmon, with bright red vessels ; on the anterior 

 five or six segments there are often, on each side, greenish black, linear, 

 transverse marks on the anterior side of the parapodia or between the 

 segments. Antennae, pale greenish. 



