596 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



second, but well developed on the third. Set?e rather long and slender. 

 Color pale yellow, with red blood-vessels showing through anteriorly. 



Length, 50'"™ 5 breadth, 2""^. This species moves like a JS^ereis. 



Near New Haven light-house, in sand, at low-water mark. 



Ehynchobolus Americanus Yerrill. Plate X, figs. 45, 46. (p. 342.) 



Glycera Americana Leidy, op. cit., p. 15, PL 11, figs. 49,50, 1855; Ehlers, Borsten- 

 wurmer, vol. i, p. 668, PL 23, figs. 43-46, 1868. 



Charleston, South Carolina, to Long Island Sound and Vineyard 

 Sound. Low- water mark to 10 fathoms. 



I follow Claparede in adopting Bhynclioholus for those species of the 

 old genus Glycera which have the proboscis armed at the end with four 

 hooks or fangs. 



Ehynchobolus dibranchiatus Yerrill. Plate X, figs. 43, 44. (p, 

 341.) 



Glycera dihrancMata Ehlers, op. cit., pp. 670-702, PL 24, figs. 10-28, 1868. 



Great Egg Harbor, New Jersey, to Long Island Sound ; Vineyard 

 Sound ; and Massachusetts Bay. Low- water mark to 8 fathoms. 

 Ehlers has given a very full anatomical description of this species. 



EoNB GRACILIS Vcrrill, sp. nov. (p. 508.) 



Body very slender, terete ; surface iridescent. Head elongated,. acutely 

 conical, composed of eight distinct, rounded annulations, the basal one 

 with a pair of minute reddish eyes ; antennae four, slender. Feet prom- 

 inent, elongated, more than equal to half the diameter of the body ; they 

 are uniramous on about thirty-two segments of the anterior part of the 

 body, and bilobed, with a small obtuse dorsal cirrus ; the upper lobe 

 is prominent, more elongated than the lower one, both cylindrical,obtusely 

 pointed; setae compound, in two small fascicles^ long, the free part ex- 

 ceeding the entire length of the foot. On the posterior half of the body 

 there is a small, slightly elevated, mammilliform upper ramus, above 

 the base of the lower ramus, and entirely separate from it, containing 

 two or more small, acute, dark setae, which project but slightly ; the 

 lower ramus is deeply bilobed, the lobes elongated, round, the upper 

 one longest, the lower one acute; on the posterior side of the base of the 

 upper lobe there is a minute, rounded setigerous lobe, and at the junc- 

 tion of the two lobes, on the posterior face, there is another small setig- 

 erous lobe ; the setae are long and slender, acute, many of them curved, 

 arranged in small fascicles. 



Length, 20'"'" ; diameter less than 1'"'". 



Off" Gay Head, 19 fathoms, in soft mud. 



Aricia ornata Verrill, sp. nov. (p. 344.) 



Body rather stout, composed of numerous very short segments, much 

 depressed and flattened anteriorly, strongly convex beneath in the mid- 

 dle region, flattened above throughout; breadth nearly the same 



