COMPLETE HARTMAN: POLYCHAETES FROM CALIFORNIA 81 



3. Composite setae f alcigerous ; subacicular simple hooks yellow 

 and distally bifid, falcigerous .... M. conferta 



4. Prostomium semicircular, with very short antennae; composite 

 setae falcigerous M. mortenseni 



4. Prostomium medially incised, provided with moderately long 

 antennae; composite setae spinigerous . . M. sanguinea 



Marphysa disjuncta, new species 

 Plate 10, figs. 1-3 



Collections. Hundreds of individuals come from many localities in 

 southern California, from Point Conception south to San Diego, chiefly 

 in depths of 50 to 100 meters, in sediments of fine green silt to sticky 

 mud. The type is selected from VELERO IV Sta. 2107. 



A larger individual measures 130 mm long, 5 mm wide and consists 

 of more than 100 segments. Branchiae are abruptly present on a short 

 anterior part of the body. The 5 prostomial antennae are smooth and 

 about twice as long as the prostomium (PI. 10, fig. 1). The prostomium 

 is trapezoidal in shape, widest in front, and its anterior margin is 

 slightly incised at the middle. Antennae are inserted in a straight trans- 

 verse line near the posterior margin of the prostomium. A pair of large, 

 oval-shaped spots behind the bases of the outer paired antennae may 

 represent eyes. The peristomium or first segment is a smooth ring 

 without parapodia or cirri, as typical of the genus. 



Branchiae are abruptly present from segment 13 or 14, and number 

 about 15 pairs; they have up to 20 filaments each, in pectinate arrange- 

 ment, and all of the filaments are about equally long and continue 

 distally to near the end of the rachis. The first and last branchial pairs 

 are only slightly smaller than the intermediate ones. 



Parapodia are lateral throughout. The ventral cirrus is at first broadly 

 conical and becomes thicker and shorter farther back but is never pad- 

 like. In postbranchial segments it is again slenderer and subconical, and 

 resembles those of anterior segments. 



Setae are of 4 kinds; throughout the body the simple setae occupy 

 the uppermost positions of the fascicle. Composite spinigers are in nearly 

 equally large bundles, but in more inferior positions. Prebranchial and 

 branchial parapodia have only simple, pointed and composite, spinigerous 

 setae, disposed in thick, spreading fascicles and accompanied by 2 nearly 

 equally thick acicula ; they are black along most of their length except 



