270 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



The first parapodium is uniFamous and has a large ovate dorsal lip 

 and a long, slender dorsal cirrus. An acicula comes to the surface at 

 the apex of the conical posterior lip of the setal lobe. There are two 

 subequal, rounded anterior lips. The tenth parapodium (fig. 19, b) 

 has well-developed notopodia and neuropodia, the notopodium being 

 essentially similar to the first parapodium. The neuropodium has 

 practically no posterior lip to the setal lobe, but there are two promi- 

 nent anterior ones. The ventral cirrus is very slender, extending 

 about halfway to the tips of the setal lips. A later parapodium (fig. 

 19, c) has on the notopodium a conical dorsal, and on the neuropodium 

 a ventral, lip. The dorsal cirrus is very small, and just inside it is a 

 prominent pigment patch. The ventral cirrus is also very small. 

 Two kinds of setae are found throughout the body. The first (fig. 

 19, d) have long pointed terminal joints, which carry hairlike processes 

 along one margin. The others (fig. 19, e) have much shorter terminal 

 joints, which, however, have the same arrangement of hairlike proc- 

 esses. The end of the terminal joint is bluntly rounded and appears 

 to be slightly twisted. In some cases it seemed as if there were setae 

 having short denticulations instead of the hairs, but probably these 

 were broken. 



The paragnath arrangement is as follows: I, 4, in a group, 1 larger 

 in front and 3 smaller behind; II, arcs of irregularly arranged 2 rows, 

 the 4 nearest the middle in each row being larger than the others; III, 

 a roughly circular diffuse patch of paragnaths ; IV, 2 rows, the parag- 

 naths slightly larger than in III ; V, 3 in a longitudinal row; VI, 2 or 3 

 large paragnaths, transversely arranged; VII and VIII, a double 

 continuous row. 



Type.— U.S.N. M. no. 20115 (Chen no. 29). 



NEREIS (NEANTHES) ORIENTALIS, new species 



The single specimen is incomplete, but since the diameter at the 

 posterior end is only 4 mm it seems probable that not much of the 

 body has been lost. What remains is 76 mm long and has a prostomial 

 width of 3.5 mm. 



The prostomial width is about equal to its length, and its posterior 

 margin has rounded ends and a slight emargination in the mid-dorsal 

 line. The diameter of the posterior margin is retained as far as just 

 in front of the anterior eyes, where it narrows by about the diameters 

 of the two eyes. From here the lateral margins extend nearly straight 

 forward to the broadly rounded anterior lateral angles (fig. 19,/). In 

 the middle of the dorsal surface is a slitHke longitudinal depression, 

 which may have been caused by the preservation methods. The eyes 

 are nearly equal in size, one pair located as mentioned above, the other 

 near the posterior margin, the lenses of the posterior pair looking 

 dorsally, those of the anterior anterolaterally. The tentacles are not 



