1168 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
piece with tooth at apex and a second blunter tooth just behind this. “Guard” extending beyond 
teeth, finely serrated along its edge. One specimen of about 70 somites had a body length of 60 mm. 
and a greatest width of 4 mm. 
Another, a sexually mature individual, showed the following conditions on one side of the body: 
Somite vi, gill of 1 branch. 
Somite vii, gill of 2 branches. 
Somite viii, gill of 3 branches. 
Somite xi, gill of 4 branches. 
Somite xiii, gill of 3 branches. 
Somite xx, gill of 2 branches. 
Somite xxi, gill of 1 branch. 
About the middle of the body the gills disappeared to reappear toward the posterior end. 
Collected at stations 3834 and 3821 in surface hauls; 3850, 43-46 fathoms, on a bottom of coarse 
sand and broken shells; 3848, in essentially similar conditions as the last, and at 3940, 59-70 fathoms, 
on a bottom of white sand and broken shells. 
Type no. 5211, U. S. National Museum. A specimen 55 mm. long, but incomplete posteriorly, 
from station 3850. 
Eunice bilobata, new species. 
Prostomium deeply bilobed, though its precise form is difficult to determine owing to distortion 
produced by the protrusion of the pharynx and jaw apparatus. Body grayish in color, with a marked 
iridescence, all parapodia and gills light brown (in alcohol). Tip of dorsal cirrus white, with a sub- 
terminal band of dark brown. Tentacles and cirri show 
no trace of articulations. Median tentacle extends to 
eighth somite, though possibly not entire in the single 
specimen. Inner lateral about equal in length to median. 
Outer lateral arise close to inner lateral, about four-fifths 
the length of latter and more slender. Eyes difficult to 
see, situated between bases of outer and inner lateral ten- 
tacles. Tentacular cirri extend to anterior end of prosto- 
mium, their ends colored like dorsal cirri of parapodia. 
All cirri much wrinkled, but with no trace of articula- 
tions. 
Mandibles flattened and thin at their ends, united 
with one another by a very narrow crosspiece on the con- 
cave median edge. Maxillse flattened at their bases, their 
outer ends cylindrical, smooth, and uniformly curved. 
Right and left dental plates each with 5 teeth. Right 
lateral paired plate with 10 teeth, left lateral with 7. Left unpaired plate with 3 teeth. A single 
accessory plate with acute apex on either side. Dental apparatus brown in color, this being very dark 
in the maxillae and lighter in the other parts. Tips of teeth on lateral plates white. 
Branchiae begin on seventh parapodium, each with main axis and 9 lateral branches (fig. 47). 
On somite 34 there are 15 or 16 of these, one having bifurcated tips. On a somite from farther back 
in the body (taken from a fragment so that its precise position could not be determined) the main 
axis was much larger than the dorsal cirrus, and its diameter great in proportion to those of the 18 
small branches which were situated along its inner face. 
Parapodium with two large, black aciculse extending into the bases of the setse. A bundle of 
finer, sharp-pointed aciculse extend into the dorsal cirrus, and in somites behind the twentieth a third 
group protrudes from the surface just above the ventral cirrus. In one parapodium there was only 
one of these, in another there were three. Ventral cirrus with swollen base, forming a prominent 
swelling on ventral surface, and a smaller, rounded, terminal portion. 
Dorsal setse long, fine-pointed, curving gently toward the end. Ventral setse compound, basal 
portion broader at tip than at base. Terminal portion short, narrower than apex of basal, with a 
terminal and a subterminal tooth. “Guard” not continued around end, finely denticulated along 
the edge (fig. 48). Anteriorly each parapodium with a rounded lobe which projects beyond the 
bases of the setse. 
