(629] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 335 
most commonly dark olive-green or 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 
Fandy; and northward to Labrador and Greenland. Also on the north- 
ern coasts of Europe 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 distinet from the body. 
Color uniform bright brownish red. 
Length, 25™™. 
Off 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 (d). 
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. 
Length, 35™"; breadth, 1.3™™ to 20. 
‘ New Haven Harbor, on the piles of a wharf, in brackish water. 
TETRASTEMMA ARENICOLA Verrill, sp. nov. Plate XIX, fig. 98. (p. 
301.) 
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. Ocelli four, those in the anterior pair 
nearer together. The lateral fosse 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. 
