436 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



similar iu size, length, aud beadiug to the median autenua. The dor- 

 sal cirri on the first body-segment are stouter and nearly twice as long 

 as the median antenna, which they resemble in form and the character 

 of the beading. On the succeeding segments the dorsal cirri -are similar 

 in structure, size, and appearance, but some are considerably shorter 

 than others, with some indications of alternation in length, which, how- 

 ever, does not appear to be regular; but the cirri of the second segment 

 appear to be one-third shorter than those of the first segment. The 

 ventral cirri are short, tapered, and scarcely exceed the setigerous lobe. 

 The setae are numerous, not very long, nor very slender, with a small 

 acute-triangular terminal article, which is minutely bideutate at tip. 

 Pharynx large, crooked, extending through about seven bady-segments, 

 armed near the anterior end by a single small, sharp, conical tooth. 

 Color yellowish white. Length about 25™™. 



Oft' Martha's Vineyard to Cape Hatteras, common aud often very 

 abundant among sponges and hydroids in 65 to 125 fathoms. 



Ophioglycera, gen. nov. 



Head large, ovate, obtuse, depressed' divided into two parts by a con- 

 striction in front of the eyes, the posterior portion with a raised middle 

 area. Antennae none. Eyes minute. Proboscis long, armed with a 

 ring of denticles, and a large jaw on each side having several teeth, 

 unequal in size ; and with a circle of soft papillae around the orifice. 

 Body large and stout, consisting of very numerous well-defined seg- 

 ments, and divided into two well marked regions; the anterior region is 

 shorter and more rounded than the posterior, and consists of shorter 

 segments, with verj^ ditierent parapodia, those of the anterior region 

 having prominent, elongated cirri, above and below, with a small, in- 

 termediate, three-parted, inferior setigerous lobe, bearing a small fasci- 

 cle of setae; upper setigerous lobe rudimentary. The posterior para- 

 podia arc much larger, and divided into two flattened, bilobed branches, 

 separated by a rounded space ; the lower ramus bears a ventral cirrus, 

 and each bears a large fascicle of setae. 



Ophioglycera gigantea Verrill, sp. nov. 



Verrill, Trans. Conn. Acad., vol. iv, pi. 15, figs. 1, la, lb; pi. 25, fig. 1, 1881. 

 Verrill, Report U. S. Fish Com. for 1833, pi. 42, figs. 185, 185a, 1885. 



Body large, very long, stout, anterior region subterete, narrower than 

 the posterior, which is broad and depressed. Head, in the living speci- 

 mens, ovate, longer than broad, narrowed, but obtusely rounded in 

 front, smooth, but with two slightly-marked longitudinal grooves, which 

 terminate in two small pits at the posterior dorsal border; four small 

 specks, which are probably rudimentary eyes, form a quadrangle on the 

 posterior segment of the head. In an alcoholic specimen, esiDcciall^' 

 when the proboscis is protruded, the head-lobe becomes much shorter 

 and subtriangular, with the tip obtuse. The buccal segment is similar 

 to the six succeeding ones. 



