586 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



tips, and in leugtli equal to half the diaoieter of the body ; posteriorly 

 they become somewhat wider, with acute, curved tips. Caudal cirri 

 small, narrow lanceolate, about as^loug as the posterior lateral lamelliP, 

 or brauchife. Color of preserved specimens pale greenish or bluish 

 gray, with narrow annulations of golden brown, and iridescent. Length 

 50™"', or more ; breadth about 1.25""". 

 Vineyard Sound, 4 to 12 fathoms, among ascidians. 



h- ,, .. r, i ^ ": ■ S " '\- 



EuLALiA GRACILIS Yerrill, sp. nov. 



Body very long and slender, with the segments deeply incised ; pos- 

 terior segments elongated. Head small, elongated, truncate behind ; 

 posterior angles not prominent, oblong, tapering but little toward the 

 front, which is obtusely rounded ; sides not swollen. Eyes of moderate 

 size, brown, situated close to the posterior margin of the head. The 

 four frontal antennre are more than half as large as the head, rather 

 stout, tapering, and the head is slightly constricted behind them ; odd 

 median one, small, slender, inconspicuous, about one-third the length of 

 the head, placed considerably in advance of the eyes. Tentacular cirri 

 rather stout, the two upper ones longest, rather more than twice as long 

 as the head } the posterior j^air, when extended backward, reaches the 

 fifth setigerous segment in preserved specimens ; the two lower ones 

 are considerably stouter and smaller, nearly equal, and are somewhat 

 longer than the head in alcoholic specimens. Branchia? of the anterior 

 segments short, oval, obtuse at ^he tip ; i)OSteriorly larger, elongated 

 oval, leaf-like. Color light greenish brown or olive, with a row of dark 

 brown spots along each side of the dorsal surface of the body. 



Length up to 65'""'; breadth about 1'"-^^ 



Vineyard Sound, G to 14 fathoms, among ascidians and hydroids. 



This species is very active in its motions. In general appearance it 

 resembles certain species of Phyllodoce, for which it might easily be 

 mistaken, owing to the small size and translucency of the odd median 

 antenna, which is not easily observed, especially with living specimens. 

 The position of the tentacular cirri is, however, sufficient to distinguish 

 the genus from Phyllodoce and Eumidia. The form of the head is quite 

 peculiar, but somewhat resembles that of I'hyllodoce gracilis, and also 

 the preceding species. 



One specimen of the Eidalia gracilis was found in which fissiparity 

 was apparently about to take place. In this, one of the segments was 

 larger than the rest, and had developed a distinct pair of eyes. The 

 specimen unfortunately died before the separation took place. 



/PhyllopocE GRACILIS Vcrrill, sp. nov. PI. XI, fig. 5G. (p. 494.) 



(?) Phyllodoce macitlata A. Agassiz, Aunals Lyceum New York, vol. viii, p. 333, 

 fig. 53, 1866 (non Miiller, nee Oersted). 



Body very long and slender. Head longer than broad, decidedly 

 cordate behind, with the posterior angles well rounded; the sides swell- 



