84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



Branchiae are first present from about segment 25, continue posteriorly 

 through a long region, and have up to 6 filaments in subpalmate ar- 

 rangement. The composite setae are falcigerous. 



M. mortenseni is known from the Pacific side of Panama and southern 

 California, in moderate depths, in rocky or rubbly sediments. 



Marphysa stylobranchiata Moore, 1909 



Moore, 1909, pp. 249-251, pi. 7, figs. 8-12. 

 Hartman, 1944a, pp. 127, 129. 



Collections. Numerous individuals come from central California in 

 intertidal depths; another was dredged off Long Point, Santa Catalina 

 Island (VELERO IV Sta. 2393), in 250-270 fms. 



This is a large, long species, measuring about 100 mm long. The 

 prostomium is about half as long as wide, and consists of 2 broadly 

 rounded lobes. The 5 antennae are smooth and short, with the median 

 or longest one about as long as the prostomium. Eyes are small and seen 

 by pushing the antennal bases apart. Branchiae are simple, tapering 

 filaments, first present from about segment 16 to 20, and gradually 

 increase in size so that by segment 22 they are about as long as the 

 accompanying dorsal cirrus. Branchiae are largest in median segments 

 and diminish in size posteriorly. Setae are of 3 kinds ; the most abundant 

 are the simple setae which are curved, slightly limbate and distally 

 pointed. Composite falcigers have a bifid tip and are distally hooded ; 

 they are most numerous in anterior segments. Comb setae are most con- 

 spicuous in posterior segments. Acicula number 3 to 5 in anterior para- 

 podia, are black at the base and have pale tips ; they taper distally. 



M. stylobranchiata is typically a northern species, ranging from Mon- 

 terey and northward, in intertidal rocky habitats. It has been recovered 

 only once from southern California, in slope depths from the leeward 

 side of Santa Catalina Island. 



Marphysa sanguinea (Montagu) 1815 



Marphysa califomica Moore, 1909, pp. 251-253, pi. 7, figs. 13-18, pi. 8, 



figs. 19, 20. 

 Hartman, 1944a, pp. 126-128, pi. 8, figs. 179-183. 



Collections. San Diego Bay, California, lower end, in clayey silt 

 flats. 



