INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 601 



forming an acute angle behind, anteriorly suddenly expanding into a 

 wide transverse frontal lobe, broadly rounded in front, with a slight 

 emargination in the middle, the lateral angles prominent and slightly 

 auriculate or recurved. Byes four, distant, the two pairs nearly parallel. 

 Proboscis small, smooth, rounded. Antennae slender, twice as long as 

 the breadth of the body. The branchiae are slender and ligulate an- 

 teriorly, and meet over the middle of the back ; but farther back they 

 gradually decrease in length, and disappear at about the anterior third. 

 The upper ramus of the feet consists of a broad, thin, foliaceous upper 

 ramus, rounded outwardly, connected, for most of its length, with the 

 brauchia, the upper end a little prominent ; and a broad cluster of setae, 

 consisting of a small upper fascicle of slender aciculae, scarcely as long 

 as the branchia, and a comb-like group of shorter and somewhat stouter 

 bent and acute setae. The lower ramus consists of a small, thin, rounded 

 process, bearing a transverse row of acute bent setae, and a ventral tuft 

 of longer and more slender ones. Posteriorly the slender setae in the 

 dorsal and ventral tufts are considerably longer ; and several stouter, 

 recurved, two-hooked, uncinate setae appear in the transverse rows of 

 acute setae, both in the upper and lower rami. Anal segment short, 

 truncate or suburceolate, somewhat bilobed ; the margin of the orifice 

 crenulated with small rounded lobes, and with four small conical papillae 

 on the upper side. Color olive-green or bright green, darker posteriorly ; 

 branchiae bright red; antennae light green, with a row of black specks. 



Length up to 100 mm ; breadth, 3 mm . 



Great Egg Harbor; New Haven; Watch Hill; Wood's Hole; burrow- 

 ing in sand, at low-water. 



Scolecolepis tenuis Yerrill, sp. nov. (p. 345.) 



Body very long and slender, depressed, especially anteriorly, gradually 

 tapering posteriorly. Head short and broad, slightly three-lobed in 

 front, the central lobe broadly rounded, the lateral ones also rounded, 

 somewhat smaller. Antennae long and slender. The branchiae are small, 

 ligulate, and exist only on the anterior segments. The setae of the dor- 

 sal fascicle are long and slender ; but those of the first three segments 

 are longer than the others, forming large fan-shaped fascicles directed 

 upward and forward ; those of the first segment longest, about twice as 

 long as the breadth of the head. Farther back the setae of the upper 

 ramus become shorter, the upper ones slender, capillary, the lower ones 

 stouter, somewhat bent, mostly acute, some uncinate. Those of the 

 lower ramus are shorter, setiform, forming large fascicles anteriorly. 

 Farther back the upper ones are partly stouter, somewhat bent, and 

 acute, and partly uncinate, while a small ventral fascicle of slender ones 

 still remains. Posteriorly the setigerous lobes of the feet become very 

 small. Color light green ; branchiae red, tinged with green ; antennae 

 whitish, with a red central line. 



Length, 80 mm ; breadth, 1.25 mm . 



Great Bgg Harbor, New Jersey; burrowing in sand, at low- water. 



