POLYCHAETOUS ANNELIDS FROM PHILIPPINE SEAS. 



593 



Family PHYLLODOCIDAE. 



Genus PHYLLODOCE Savigny. 



PHYLLODOCE DUPLEX Mcintosh. 



Pliyllodoce duplex McIntosh, 1885, p. 1G7, pi. 27, fig. 8; pi. 32, fig. 9; pi. 

 15o, fig. 1. 



Collected at station D5113, Sombrero Island, Balayan Bay, 159 

 fathoms, dark green mud bottom. 



Genus MYSTA Malmgren. 



MYSTA MACULATA, new species. 



A single specimen, with a length «of approximately 60 mm. Width 

 of head between tentacles, 0.5 mm. ; width at somite 20, 1.5 mm. 

 There were about 146 somites 

 present, the posterior end having 

 been lost. Anteriorly the propor- 

 tion of length of somite to breadth 

 is as 1 to 8, and the dorsal cirri are 

 inconspicuous. Beginning with 

 approximately the fortieth somite 

 there is a gradual change in the 

 proportion of length to breadth, 

 and toward the posterior end this 

 proportion is about as 1 to 2. An- 

 teriorly the dorsal cirri are very 

 inconspicuous, and while they 

 overlap one another to a certain 

 extent they cover no part of the 

 somite surface. Posteriorly these 

 cirri become much more promi- 

 nent, but still do not overlap the 

 body. Each dorsal cirrus is 

 marked with a median dark spot, 

 rather faint anteriorly but very 

 prominent posteriorly. The gen- 

 eral body color (in alcohol) is a 

 very light brown, marked on the 

 dorsal surface with dark spots, 

 which in the anterior somites show 

 a tendency to arrange themselves in a transverse row near the 

 anterior border of the somite. Ventrally the body has a broad 

 median dark band, spotted with white. 



The prostomium (fig. 1) is, roughly speaking, lens-shaped, with 

 the long diameter transverse, this long diameter being about one- 

 fourth longer than the antero-posterior one. About one-quarter of 



Figs. 1-4. — Mysta maculata, 1, Head X 

 20 ; 2, 15th parapodium X 45 ; 3, Com- 

 pound seta X 295 ; 4, Parapodium 

 from middle region X 45. 



