268 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.83 



The maxillae are very dark. The carrier of the forceps is nearly 

 circular at its base and is attached to the forceps by narrow stems 

 (fig. 18, n). Each of the paired plates has three heavy teeth, the 

 unpaired one has four, the right distal has four, and the left distal 

 has three. The mandibles are dark brown and have slender stems 

 (fig. 18, o). The beveled portions are covered with a thin whitish 

 incrustation. 



Type.—V.S.'N.M. no. 20114 (Chen no. 25). 



Family NEREIDAE 



Genus NEREIS Cuvier 



NEREIS (NEANTHES) OXYPODA von Marenzeller 



Nereis (Alilta) oxypoda von Marenzeller, 1879, pp. 120-122, pi. 2, fig. 3. 



A single specimen (Chen no. 27) lacking the posterior region. The 

 pharynx was retracted, but so far as could be determined from 

 dissection the paragnath formula agrees better with von Marenzeller's 

 original description than with that of Fauvel, who reported it from 

 the Gulf of Pei Tcheu Ly (1933, p. 22). 



NEREIS (NEANTHES) LINEA, new species 



Body length of type, 180 mm; prostomial width, 2.5 mm; peristo- 

 mial width, 4.5 mm. At the sixth setigerous somite the body width 

 (counting the parapodia) is 8 mm. From the fourteenth setigerous 

 somite the body gradually narrows to the pygidium, which is 1 mm 

 wide and carries one pair of long anal cirri. 



The prostomium (fig. 19, a) is a little longer than its basal width 

 and widens slightly from its posterior border to just in front of the 

 anterior pair of eyes, where it narrows to about two-thirds of its basal 

 width. It is difficult, however, to determine the precise boundaries 

 of the prostomium, because it merges so gradually on either side into 

 the basal joint of the palp. The anterior end is rather narrow, and 

 the two conical tentacles are situated less tlian their own diameter 

 apart. In the type the palps are bent ventrally and so do not show 

 well in a dorsal view. The basal joint is heavy, the terminal one a 

 mere knob, the basal joint extending in front of the tentacles. The 

 posterior dorsal tentacular cirrus extends to the sixth setigerous somite, 

 the anterior dorsal to the second, and the posterior ventral to the 

 first, while the anterior ventral is shorter than the peristomium, all 

 being very slender. On its lateral margins the peristomium is about 

 two-thirds as long as the prostomium, while on the mid-dorsal line it 

 is about half as long as on the margins. Setigerous somites 1 to 4 are 

 about two-thirds as long as the mid-dorsal length of the peristomium, 

 while later ones increase to twice this length. This latter length is 

 continued throughout the greater part of the body. On the peristo- 



