186 TJ.S. NATIONAL ]\rQSEUM BULLETIN 227 



a ciliated groove along the body. Middle parapodium (fig. 46c) with 

 elongate notopodiiim with shorter rounded postsetal lip and unequally 

 bilobed presetal lip, the upper part short, rounded and the lower part 

 longer, papilliform, extending diagonally ventrally, with a fan-shaped 

 bundle of slender notosetae. Notosetae (fig. 4:Qd) simple, slender, 

 finely spinous along slightly limbate border, tapering to fine tips. 

 Dorsal cirri short, digitiform, emerging midway dorsally on notopodia. 



Neuropodia slightly longer than notopodia, similar in shape except 

 upper part of presetal lip is larger, subtriangular. With a fan-shaped 

 group of neurosetae, few lower ones simple, shorter, similar to noto- 

 setae; rest of neurosetae (fig. 46, g,/) longer, compound spinigerous 

 with stem heterogomph, spinous or frayed terminally, with blade long, 

 tapering to capillary tips, finely spinous along one side. Ventral cirri 

 cylindrical, extending distally to end of neuropodial lobe. Anal end 

 without cirri (?) . Colorless or with scattered brownish spots. 



Biology.— -Dredged on bottoms of mud, mud with sand, gravel, and 

 broken shells. 



Material examined. — Off Massachusetts (Albatross Station 2242, 

 40°15' N., 70° 27' W., 58 fathoms, 1884; Station 2248, 40°07' N., 

 69°07' W., 67 fathoms, 1884). 



Distribution. — Mediterranean, Atlantic ofT Morocco, off Massa- 

 chusetts, Yellow Sea, off Southern California. In 27 to 1,030 fathoms. 



Family Nephtyidae (=Nephthy(lidae) 



Body elongated, linear, subtetragonal in cross section, with nu- 

 merous short segments, tapered slightly anteriorly and more so 

 posteriorly. Prostomium (fig. 49,a,c,f/) small, somewhat flattened, 

 angidate (subpentagonal, subrectangular, subquadrate). Four short, 

 conical antennae present, an anterior pair at the anterior angles of the 

 prostomium and a more posterior and slightly ventral pair (latter may 

 be hidden as viewed dorsally; may be considered as ventral palps). 

 A pair of nuchal organs at the posterolateral margins (inconspicuous 

 ciliated sacs when inverted, appearing as a pair of papillae if everted). 

 With or without eyes (often small, deeply buried, inconspicuous; 

 according to Clark, 1956a, 1957, nearly all species of N'ejjhtys possess 

 a pair of eyes, each consisting of a pair of inverted single-celled 

 photoreceptors which lie in pigment cups on the side of the brain; 

 they are deeply embedded in the ganglion and, except in the small 

 species, are not visible from the exterior; only the small species 

 were able to orient themselves in a light beam). 



First or tentacular segment extending lateral and ventral to 

 prostomium, with reduced notopodia and neuropodia with setae, 

 with a pair of ventral tentacular cirri lateral to the neuropodia, similar 

 to the antennae, with or without a pair of dorsal tentacular cirri. 



