[603] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 309 



SPIO ROBTJSTA Verrill, sp. nov. (p. 345.) 



Body stout, broadest anteriorly, tapering posteriorly, but little de 

 pressed except anteriorly, very convex beneath, flattened above. Head 

 broad., somewbat angular 5 the median lobe truncated and slightty emar- 

 ginate in front ; lateral lobes a little shorter, wide, obtuse in front, 

 slightly augulated laterally ; a small median, conical elevation on the 

 posterior part of the head. Antennae long, rather stout. Branchiae 

 long, narrow, tapering. Upper rani us of the feet with a small, obtuse 

 setigerous lobe, bearing a small fascicle of short setae, considerably 

 shorter than the branchiae, even on the anterior segments, and a foli 

 aceous process arising behind the setrgerous lobe, broadly rounded on 

 its thin outer edge ; the upper end free and obtusely pointed ; farther 

 back the setae are shorter and the foliaceous process smaller and less 

 prominent. The lower ram us on the anterior segments has a small, 

 prominent, semicircular foliaceous process and a small, dense fascicle of 

 short seta3, crowded in several transverse rows ; on the eighth and sub 

 sequent segments the foliaceous processes become larger and wider, and 

 the setae more numerous, crowded, and partly unemate ; still farther 

 back the setae are nearly all uncinate, except a very small ventral tuft 

 of slender ones, and form long, double, transverse rows, projecting but 

 little beyond the surface. Color greenish. 



Length, 50 mm , or more ; breadth, 3 mm to 3.5 mm . 



Wood s Hole and Naushon Island 5 in sand, at low-water mark. 



POLYDORA CILIATUM Claparede(?). Plate XIY, fig. 78. (p. 345.) 



A. Agassiz, On the Young Stages of a Few Annelids, in Annals Lyceum Nat. Hist, 

 of New York, vol. viii, pp. 323-330, figs. 26-38, 1866 (embryology). 



Naushon Island and Massachusetts Bay; in muddy sand, at about half- 

 tide (A. Agassiz). 



The adults of this species were not found by us. The young were 

 frequently taken in the towing-uets. 



A young Polydora, belonging perhaps to a different species, was 

 dredged off New Haven, in 4 to 6 fathoms, shelly bottom. It was about 

 12 mm long. The color was pale yellow, with small black spots along 

 the sides between the fascicles of setae ; a red dorsal vessel ; antennae 

 white. 



OPHELIA SIMPLEX Leidy. (p. 319.) 



Marine Invert. Fauna of Rhode Island and New Jersey, p. 16, 1855. 

 Body short, smooth, iridescent, well rounded above, flat below ; 

 usually found coiled up, so that the extremities meet, or nearly so, and 

 resembling in &quot;general form the larvae of certain beetles and flies. Head 

 very acute conical 5 the buccal segment suddenly enlarges ; mouth be 

 neath, with thick evertile lips, the lower one generally protruded as a 

 large rounded lobe. Posterior end terminated by about ten unequal, 

 round, blunt, fleshy, simple papillae, of which the two ventral ones 



