{619] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 325 
anteriorly, narrowing to the end. Collar broad, with a nearly even 
margin, often somewhat sinuous at the sides, divided above and below, 
the lobes rounded at the angles. The collar is a little broader below 
than above. Branchiz long, slender, recurved in expansion, connected 
by a broad and very thin membrane, continued as thin borders of the 
branchie to their tips, which are destitute of pinnw for some distance. 
Body pale flesh-color, with a darker median line, reddish anteriorly, 
darker greenish or brownish, posteriorly; branchiz pale yellowish or 
greenish, each with a flake-white spot near the base outside. Other 
specimens were greenish gray, with green branchiz. Some were flesh, 
color, with a bright-red dorsal vessel; the branchix flesh-color, without 
the white spots at the base. 
Length, in extension, about 20™™; diameter of body, 1.o™™. 
Deep water off the mouth of Vineyard Sound; off Martha’s Vineyard, 
in 21 and 23 fathoms; off Block Island, in 29 fathoms, sandy mud, 
abundant. Cosco Bay, 7 to 20 fathoms. 
This species makes slender tubes, covered with fine sand. 
FABRICIA LEIDYI Verrill, sp. nov. (p.323.) 
Body very small and slender, tapering a little to both ends, in exten- 
sion considerably exsert from the slender tube; eleven segments bear 
fascicles of sete; the segments are about as long as broad, slightly con- 
stricted at the articulations, with the anterior margin a little promi- 
nent; anal segment small, tapered to a blunt point, bearing two small, 
dark ocelli. Branchiz six, subequal, forming three symmetrical pairs, each 
one with five to seven slender pinnz on each side; the basal pinne are 
about as long as the main stem, the others successively shorter, so that 
all reach to about the same level. Tentacles short, thick, bluntly rounded 
at the end, strongly ciliated. At the base of the branchiz, on each side, 
is a red, pulsating vesicle, the pulsations alternating in the two; just 
back of these, on the first segment, are two brown ocelli; a little farther 
back, and near together, on the dorsal side, are two auditory vesicles, 
each with a round central corpuscle. The fourth and eleven succeeding 
segments bear small fascicles of acute, bent sete, about as long as halt 
the diameter of the body; on the middle segment there are about four 
or five sete ina fascicle; on the ninth, three; on the tenth, two; on the 
eleventh, one or two, in the specimens examined. Intestine rather 
wide, but narrowed at the eighth setigerous segment, and after that 
slender, bordered by a red blood-vessel on each side. In the fourth 
setigerous segment there are three globular granulated organs. color, 
yellowish white, tinged with red by the circulating fluid. 
Length about 3™"; diameter about 0.25™"; expanse of branchie, 
0,8=", The specimens measured may be immature. 
New Haven to Vineyard Sound, common at and below low-water 
mark; Cisco Bay. 
