INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 629 



most commoDly 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 Yiueyard 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 iDrobably belonging to Cere- 

 hratuliis, were most likely identical with this species. 



Kemertes (!) 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, Bhode 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. 



JTe]mertes, (?), 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 Watch Hill, with the preceding. 



This is, perhaps, a species of Gosmocepliala. 



Kemertes, 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. 



Tetrastem:ha arenicola Yerrill, 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 fossre 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 fossiie. Body deep flesh- 

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



