312 ANNELIDA FROM BERMUDA. 
Fam. NEREID. 
NEREIS Cuvier. 
NEREIS BAIRDII, n. sp. 
(Plate VIII, Figs. 22-28.) 
The head of this species (Fig. 22) is quite long, the anterior thirds 
set off from each other and bounded by lines curving inward; the pos- 
terior third with convex sides; posterior margin straight. 
Eyes not very large, circular, lateral. 
Antenne about one-half as long as the head, removed from each 
other, at origin, by less than their own diameter; inserted in slight 
depressions of the anterior margin of the head; bluntly conical. 
Palpi very long, not large, not tapering, with large terminal articles, 
which, in alcoholic specimens, are nearly spherical. 
The buccal segment, in contracted specimens, has the same length 
as the second segment; probably double that length in life. 
The maxillary ring of the proboscis is short (Figs. 224, 23); the parag- 
nathi are complete; mostly conical; arrangement, i, irregularly V- 
shaped; ii, double series, irregular; iii, two transverse, linear series; iv, 
numerous, irregular; v, sometimes wanting, sometimes one, two, or 
three, small; vi, on each side a single, narrow, elongated transverse 
denticle, ends rounded; situated on elevations (Fig. 22) which have 
straight inner margins; outer margins straight to near the anterior end, 
when they curve inward; vii and viii in two series, the anterior com- 
posed of a few large denticles, the posterior more numerous and smaller. 
Tentacular cirri with stout cylindrical basal articles; the cirri them- 
selves delicate; the posterior superior longest, reaching back to the 
- eighth segment; the others much shorter, as shown in the figure. 
Feet rather stout and short; on the anterior segments (Fig. 24) the 
lingule and rami are nearly of the same length, stout, conical. Dorsal 
cirrus arising from the upper margin of its lingula, stout, conical, not 
reaching quite to the end of the lingula. Ventral ramus bi-labiate; an- 
terior lip a little longer than the posterior. Ventral cirrus arising just 
within the base of its lingula, delicate, finger-shaped, nearly as long as 
the lingula. Further back the feet undergo some changes. The su- 
perior lingula is enlarged (Fig. 25), the dorsal cirrus moves nearer the 
apex of its lingula, and on the extreme posterior feet becomes a little 
more delicate (Fig.26.) The dorsalramus becomes smaller, more Sharply 
conical. The ventral ramus shortens, especially its anterior lip. The 
