POLYCHAETE WORMS, PART 1 205 



Nephtys longosetosa Hartman, 1944a, p. 339, pi. 15, fig. 7. — Pettibone, 1954, p. 

 268, fig. 30/; 1956a, p. 558. 



Description. — -Length up to 170 mm., width up to 6 mm., segments 

 up to 120. Tentacular segment with dorsal and ventral tentacular 

 cirri subequal. Parapodia with acicular lobes slightly bilobed to 

 rounded. Anterior lamellae rudimentary. Notopodial posterior lam- 

 ellae in anterior region rather large, rounded, bilobed; in middle 

 (fig. 47a) and posterior regions the notopodial posterior lamellae 

 extend slightly beyond or about same length as acicular lobes. Neuro- 

 podial posterior lamellae larger than acicular lobes in anterior region; 

 they extend well beyond the acicular lobes in the middle and posterior 

 regions, bilobed or irregularly sinuous. Preacicular setae short, 

 barred; postacicular setae long, flowing, finely spinous. Ventral 

 cirri conical; dorsal cirri long, digitiform. Branchiae cirriform, sickle 

 shaped, begin on setigers 3-4, continuing to near posterior end. 



Biology. — Dredged on bottoms of sand, sandy mud, gravel, stones 

 and mud. May be found in clean sand on moderately exposed 

 beaches (Southward). 



Material examined. — Massachusetts (south Martha's Vineyard 

 Lightship, 16 fathoms). 



Distribution. — Widely distributed in the Arctic. Also Iceland, 

 Faroes, Norway to France, Hudson Bay, Labrador to Massachusetts, 

 Alaska to Lower California and Panama, north Japan Sea, Straits of 

 Magellan. Low water to 528 fathoms. 



Family Sphaerodoridae 



Body short, oval or elongate, cylindrical. Prostomium and tentac- 

 ular segment indistinct, covered with papillae, some of which are 

 larger, resembling antennae and tentacular cirri. Eyes usually 2 or 

 4, under integument. Anterior end may be invaginated. Integu- 

 ment covered with small glandular papillae and two or more rows of 

 segmentally arranged large spherical glandular capsules. The cap- 

 sules just dorsal to the parapodia are sometimes referred to as dorsal 

 cirri; they differ from the usual type of dorsal cirri, however, in that 

 they are immovable, un jointed and glandular, rather than sensory. 

 Segnientation indistinct except as marked by the parapodia. Para- 

 podia uniramous, covered with papillae, some of which may be longer. 

 Setae simple or compound. Pygidium bears a median papilla and 

 a pair of globular capsules. Eggs are large, granular cells with tough, 

 smooth or papillose shells. Proboscis eversible, unarmed, smooth 

 globular or cylindrical. 



