304 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [598] 
mence on the twenty-sixth setigerous segment as minute papille; on 
the twenty-eighth they become prominent and acute-conical; farther 
back they become long, lanceolate, thin, foliaceous, as long as the diame- 
ter of the body. 
On the twenty-three anterior setigerous segments the “ feet” are rep- 
resented by two short, dense, fan-shaped fascicles of sete on each side: 
On the twenty-fourth segment a small papilliform lobe, or ventral cirrus, 
appears below the lower ramus, which rapidly becomes larger on the 
succeeding seginents, becoming quite conspicuous on the twenty-ninth 
segment; at about the twenty-eighth it becomes broader, and divided 
into three small lobes, the lowest broadest and thinnest, and a bilobed 
setigerous lobe is developed. At the thirtieth the ventral lobe becomes 
broader, somewhat foliaceous, with a rounded outline; farther back 
this becomes still larger and more foliaceous, with a broadly-rounded 
flexuous outer border, and the upper branch of the setigerous lobe be- 
comes an elongated ligulate process, directed upward, and similar in 
form to the branchiz, though smaller and more slender, but the lower 
branch remains small and rounded; a small fascicle of long, slender 
sete arises from between them. On the twenty-seventh segment an 
upper cirrus appears on both the upper and lower rami, in the form of 
a small papilla, which becomes somewhat elongated and tapering at the 
twenty-ninth; that of the lower ramus continues small throughout, and 
much shorter than the setigerous or ventral lobes, but that of the upper 
ramus becomes rapidly larger, longer, and more ligulate, corresponding 
nearly with the branchiz in size, form, and rate of increase. On the 
middle and posterior regions the upper ramus consists of this long, 
thin, lanceolate cirrus and a fascicle of long, slender set, arising from 
the anterior face of its base, and in length considerably exceeding the 
cirrus; the setz are pale yellow. Those of the upper ramus are short 
anteriorly, and become decidedly longer at the twenty-eighth segment, 
and on the thirty-second and subsequent segments they form a long, 
divergent, fan-shaped fascicle; color, when living, ocher-yellow, orange- 
yellow, to yellowish brown, generally brighter yellow posteriorly. Usu- 
ally there are two rows of brown spots along the back, and posteriorly 
there is a dorsal red or reddish brown line; branchizx blood-red. 
Length of large specimens up to 375™™ or more; breadth, 10™; ordi- 
nary specimens are about 300™™ long and 7™™ broad. Owing to the 
facility with which it breaks up when disturbed, it is difficult to obtain 
entire specimens of large size. 
Great Egg Harbor, New Jersey; New Haven; Wood’s Hole; in sand, 
at low-water. 
ANTHOSTOMA FRAGILE Verrill, sp. nov. (p. 344.) 
Body long and slender, composed of very numerous segments, very 
fragile, and prone to divide spontaneously when disturbed; thickest 
and sub-cylindrical anteriorly, tapering rapidly to the head; posterior part 
