INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 605 



on the dorsal surface ; a row of elongated dark spots on each side be- 

 tween the fascicles of setae ; the setae dark gray. 



Length, 75 mm ; diameter, 3 mm . 



Off Buzzard's Bay, in 25 fathoms, mud; Bay of Fundy, 10 to 90 

 fathoms, mud ; near Saint George's Bank, 110 and 150 fathoms, mud. 



ScalibreGtMA. brevicauda Yerrill, sp. nov. (p. 416.) 



Body rather short, with a narrow, tapering anterior portion ; a swollen 

 middle region ; and a narrow, tapering caudal portion ; lower surface 

 with a very narrow, smooth median area, divided transversely into a 

 series of small rounded prominences by slight depressions. Head small, 

 transverse, truncate or slightly concave in front, the angles produced 

 and prominent. On the anterior region four segments bear short, tufted 

 branchiae, close to the base of the upper fascicles of setae, which are 

 rather long and slender; each of these segments also has a dorsal 

 transverse row of rather large and conspicuous blackish granules on its 

 posterior margin, and also a black spot on the sides below the branchiae. 

 The surface of all the anterior segments is regularly and rather finely 

 granulous, the granules in transverse rows. The middle region, com- 

 posed of about ten segments, is thicker, and sometimes much swollen, 

 and the feet are represented only by small fascicles of slender setae. 

 The caudal region is less than one-half the entire length in preserved 

 specimens, and is rather slender and tapering, composed of about sixteen 

 segments; -the rami of the feet consist of a prominent, obtuse papilla, 

 both above and below, with a blackish spot at the end, and bearing a 

 fascicle of slender setae, in length rather exceeding half the diameter of 

 this part of the body. Color, when living, dark brownish red, tinged 

 with yellow at both ends. 

 Length, 32 mm ; diameter, 2.5 mm . 

 Off New Haven, 4 to 6 fathoms, shelly bottom. 



Trophonia affinis Yerrill. PL XIV, fig. 75. (p. 507.) 



Siphonostomum affi,ne Leicly, op. cit., p. 16 (148), 1855. 



Body rather slender and elongated for the genus ; skin irregularly 

 rugose,, granulous, anteriorly covered with small papillae. The eight 

 branchiae are cylindrical, thick, blunt, unequal; two tentacles stouter 

 than the branchiae, sulcate beneath. On the four anterior segments the 

 upper and lower fascicles of setae are much elongated and directed for- 

 ward. On the fifth and following segments those in the upper fascicles 

 are capillary, divergent, six to ten in each fascicle ; in the lower fascicles 

 there are about three stout, slightly curved, acute, deep yellow setae. 

 On the third and fourth segments the setae of the upper fascicles are 

 longer and larger than those in the lower ones ; posteriorly the lower 

 setae become longer, stouter, and more curved at the tip, the lowest one 

 becoming hook-like. 



Length, 60 mra ; diameter, 3.5 mm . 



