INVERTEBRATE 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 G 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 i^robably belonging to Cere- 

 hratiihis, 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""". 



Off Watch Hill, Rhode Island, among rocks, in 4 to 6 fathoms. A 

 species, apparently the same, also occurred in 25 fathoms oft* Buzzard's 

 Bay. 



This was red with two dark red spots anteriorly. No ocelli were 

 detected. 



Nemeetes, (?), species undetermined (b). 



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 W^atch Hill, with the preceding. 



This is, perhaps, a species of CosmoceplmJa. 



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 2""". 



New Haven Harbor, on the piles of a wharf, in brackish water. 



Tetrastemma arenicola Yerrill, sp. no v. 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 fosste 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 fossjie. Body deep flesh- 

 color or pale purplish. Length, about 100""", in extension. 



