{629] INVERTEBRAT! ANIMALS OF VINEYARD SOUND, ETC. 30D 
most commonly dark olive-green er blackish green above, and somewhat 
lighter below, the head margined with lighter ; frequently the color is 
dark liver-brown or reddish brown, and the back is usually crossed by 
faint pale lines, placed at unequal distances. 
Bazzard’s Bay and Vineyard Sound, under stones, between tides, and 
in 4 to 6 fathoms, rocky bottoms, very common; Casco Bay and Bay of 
Fundy; and northward to Labrador and Greenland. Aliso on the north- 
ern coasts of Earope to Great Britain. Abundant under stones between 
tides, and in shallow water. 
The specimens referred to on page 324 as probably belonging to Cere- 
bratulus, were most likely identical with this species. 
NEMERTES (?) species undetermined (a). (p. 498.) 
Body elongated, moderately stout; head not distinct from the body. 
Color uniform bright brownish red. 
Length, 25™™. 
Oif Watch Hill, Rhode Island, among rocks, in 4 to 6 fathoms. A 
species, apparently the same, also occurred in 25 fathoms off Buzzard’s 
Bay. 
This was red with two dark red spots anteriorly. No ocelli were 
detected. 
NEMERTES, (?), species undetermined (0). 
Body slender, sub-terete ; head not distinct from body. Ocelli incon- 
Spicuous, apparently about three in a row on each side of front of head. 
Color of head and body, above, brownish red, with a whitish ring around 
the neck, which recedes in the middle, above. 
Length, 8™". 
Off Watch Hill, with the preceding. 
This is, perhaps, a species of Cosmocephala. 
NEMERTES, species undetermined (c). 
Body slender; head not separated by a constriction. Ocelli very 
numerous, arranged in a long cluster on each side of the head. Color 
uniform olive-green above and below. 
Hength, 3o™™; breadth, 1.32" to.2™™. 
New Haven Harbor, on the piles of a wharf, in brackish water. 
TETRASTEMMA ARENICOLA Verrill, sp. nov. Plate XIX, fig. 98. (p. 
351.) 
Body sub-terete, long, slender, slightly depressed, of nearly uniform 
width; the head is very versatile, usually sub-conical or lanceolate, 
flattened, occasionally becoming partially distinct from the body by a 
slight constriction at the neck. QOcelli four, those in the anterior pair 
nearer together. The lateral fossie are long and deep slits on the sides 
of the head ; mouth or ventral pore small, often sub-triangular, situated 
just back of the posterior ends of the lateral fossze. Body deep flesh- 
color or pale purplish. Length, about 100™, in extension. 
