[607] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 313 
iridescent beneath; sides often with dark brown specks; anterior 
branchial cirri usually bright orange, with ared central line; lateral ones 
darker yellow or orange, generally with a central line of bright red, due 
to the blood-vessels showing through. 
Length up to 150"; diameter, 5™™ to 7"; length of branchial cirri, 
60™™ to 100™™. 
New Haven to Vineyard Sound; low-water to 6 fathoms, in sand and 
gravel; common. 
CIRRATULUS TENUIS Verrill, sp.nov. (p. 416.) 
Body slender, elongated, strongly annulated. Head conical, de- 
pressed, acute. The first four rings behind the mouth are longer than 
the rest, and destitute of appendages. The branchie and sete com- 
mence at the fifth segment; the branchie form a cluster on each side, 
and are long and filiform; farther back and on the middle region there 
is usually a pair of branchial cirri on each segment, but posteriorly they 
become distant and irregular. Set long and slender in each ramus, the 
upper ones exceeding in length the diameter of the body on the anterior 
and middle regions, but becoming much shorter posteriorly. In alcohol 
the integument is iridescent. No eyes were detected. 
Length, 40™™; diameter, 1.25°™. 
‘Vineyard Sound, 6 to 12 fathoms, among compound ascidians; 23 
fathoms off Martha’s Vineyard. 
CIRRHINEREIS FRAGILIS Quatrefages. (p. 397.) 
Histoire naturelle des Anuelés, vol. i, p. 464. Cirrhatulus fragilis Leidy, op. cit., 
p. 147 (15), Plate 11, figs. 39-43, 1855. : 
Point Judith, Rhode Island, under stones at low water (Leidy). 
Specimens, apparently of this species, were dredged in Vineyard Sound. 
NARAGANSETA CORALII Leidy. (p. 494.) 
Marine Invertebrate Fauna of Rhode Island and New Jersey, p. 12 (144), Pl. 
11, figs. 46-48, 1855; Quatrefages, op. cit., vol. i, p. 468. 
New Haven; Watch Hill; Point Judith; in Astrangia Dane. 
Our largest specimen had ten pairs of cirri; the first three pairs orig- 
inate from one segment, the lowest being stouter and lighter colored 
than the rest. 
DODECACEREA, species undetermined. (p. 422.) 
A species, belonging apparently to this genus, was dredged off New 
Haven Harbor, in shallow water, but the specimens are too young for 
accurate determination. 
CLYMENELLA Verrill, gen. nov. 
Body elongated, composed of about twenty-two segments exclusive of 
the cephalic and anal segments. All the segments, except the buccal 
and three anteanal, setigerous; they bear fascicles of slender sete above 
