POLYCHAETOUS ANNELIDS 



33 



those of the first two parapodia but are broader and pro- 

 trude farther from the surface. The natatory setae look 

 much like those of some compound setae of the nereids 

 (pi. I, fig. 9). The terminal joint is flattened and sharp- 

 pointed, and carries on one margin a row of sharp teeth 

 set well apart. 



The pygidium (pi. I, fig. 10) is bluntly rounded and 

 carries two pairs of blunt cirri. 



The type is no. 20080 in the United States National 

 Museum and was collected in 100 m at station 149. 

 Others were taken as indicated below. 



Sta- 

 tion 



50m 



100 m 



1000 m 



Sta- 

 tion 



50m 



100 m 



1000 m 



22 

 52 

 56 

 64 

 96 



99 

 100 

 136 

 137 

 149 



(See map 1, p. 56) 



Lopadorhynchus nans Chamberlin 



Lopadorhynchus nans Chamberlin, 1919, pp. 116-119, 

 pi. 17, figs. 1-5. 



Sta- 

 tion 



Sur- 

 face 



50 m 



100 m 



Sta- 

 tion 



Sur- 

 face 



50 m 



100 m 



20 

 28 

 29 

 35 

 39 

 45 

 47 

 50 

 63-64 

 82 

 90 



(See map 1, p. 56) 



Genus PELAGOBIA Greef 



Pelagobia viguieri Gravier 



Pelagobia viguieri Gravier, 1911, p. 62. 

 Pelagobia viguieri Chamberlin, 1919, pp. 122-125. 



These the author has identified from Chamberlin's 

 description. As indicated in the following list of sta- 

 tions, the species is widely distributed in both the Atlan- 

 tic and Pacific areas. 



Sta- 

 tion 



Sur- 

 face 



50 m 



100 m 



Sta- 

 tion 



Sur- 

 face 



50m 



100m 



39 

 40 

 41 

 42 

 43 

 44 

 45 

 47 

 49 

 52 

 55 

 56 

 58 

 61-62 

 64-65 

 64 

 65 

 66 

 67 

 68 

 69 

 70 

 71 

 72 

 73 

 74 

 75 

 76 

 77 



X 

 X 

 X 

 X 

 X 

 X 

 X 



X 



X 

 X 

 X 

 X 



98 

 99 

 100 

 103 

 104 

 105 

 106 

 107 

 108 

 109 

 110 

 111 

 112 

 113 

 114 

 115 

 117 

 120 

 128 

 137 

 139 

 147 

 149 

 151 

 152 

 153 

 154 

 156 

 157 



X 

 X 



X 

 X 

 X 

 X 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



X 

 X 

 X 



X 

 X 

 X 

 X 



X 



X 



X 



X 

 X 

 X 



X 

 X 

 X 

 X 



X 

 X 



X 



(See map 1, p. 56) 



FAMILY lOSPILIDAE 



Genus PHALACROPHORUS Greef 



Phalacrophorus niger n. sp. 



(Plate I, figure 15) 



In the type the body length is 4 mm and there are 

 twenty-five somites but it is not probable that the body 

 is entire, some of the posterior region having been lost. 

 The most noticeable feature is the surface pigmentation, 

 which, over the first two somites and prostomium, is in 

 irregular blotches but in later somites appears as large, 

 many-branched chromatophores (plate I, fig. 15). In one 

 specimen, in the anterior somites, there is one large 

 chromatophore on either side, dorsal to the parapodial 

 base, with irregular pigment patches on the dorsal sur- 

 face between them; in the sixth and seventh somites 

 there are two large patches on either side; in the eighth 

 there is a median one near the anterior somite border; 

 and in the ninth there are two of this latter type of patch- 

 es. In later somites there is a restriction of the large 

 chromatophores to one on either side, with a number of 

 smaller ones scattered between them on the dorsal sur- 

 face. Throughout the greater part of the body there is a 

 single chromatophore on the anterior face of each para- 

 podium and typically there is a transverse row of three 

 on the ventral face of each somite. 



The prostomium (pi. I, fig. 15) is rounded and car- 

 ries two lateral outgrowths which are probably to be re- 

 garded as palps. There are two round, brown eyes set 

 well apart on the prostomial surface. In the specimen 

 figured they are sunk under the surface and are some- 

 what obscured by surface pigment. Between, and a little 

 in front of them is a pigment spot which has a superfi- 



