INVEKTEBEATE ANIMALS OF VINEYARD SOUND, ETC. 629 



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. 



Buzzard'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. 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- 

 bratulas, were most likely identical with this species. 



Nemeetes (!) species undetermined (a), (p. 498.) 



Body elongated, moderately stout ; head not distinct from the body. 

 Color uniform bright brownish red. 



Length, 25 mm . 



Off Watch Hill, Rhode Island, among rocks, in 4 to C 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 (&). 



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 mm . 



Off Watch Hill, with the preceding. 



This is, perhaps, a species of Gosmocepliala. 



Nemertes, species undetermined (<?). 



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 mm ; breadth, 1.3 mm to 2 mm . 



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. Ocelli four, those in the anterior pair 

 nearer together. The lateral fossae 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 fossa?. Body deep flesh - 

 color or pale purplish. Length, about 100™ m , in extension. 



