240 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



Recurved cirri are directed outward. They are cirriform, present 

 from the third setigerous segment to the end of the pieces, and do not fill 

 the interramal space. Where best developed, at about the twenty-fifth seg- 

 ment, they extend distally to the neuropodium, but by the fiftieth segment 

 (pi. 42, fig. 106) they are much smaller. 



Parapodia are well developed, the rami of the first few segments ap- 

 proximately as far apart as those of the fifty-fifth segment, but those of 

 the latter are longer. The postsetal lobes are conspicuous, broad, folia- 

 ceous, extending distally nearly as far as the shorter postacicular setae. 

 They are slightly concave so as to partly envelop the fan-shaped postsetal 

 fascicles. The preacicular lobes are broadly oval, but comparatively short. 

 They conceal most of the acicular lobes except for their free ends where 

 the acicula emerge. 



Setae are burnt amber in color. The preacicular fascicle contains 15 to 

 20 slender, barred setae which are curved at their distal ends, the barred 

 area limited to the distal half of the free part of the seta. The postacicular 

 fascicle includes numerous, longer, serrated setae (pi. 42, fig. 109), coars- 

 er than the barred setae, and also fewer, almost smooth, though similar 

 setae in the dorsalmost and ventralmost parts of the notopodial and neu- 

 ropodial fascicles. No lyre setae have been observed. 



Nephthys panamensis has heretofore been known only through a 

 single, incomplete, macerated individual (Monro, 1928, p. 81). The 

 individuals described above are believed to be the same because of the 

 similarity in the parapodial lobes of the median segments, the presence of 

 a dark neural stripe, and the dark markings on the prostomium. 



Distribution. — Panama; Gulf of California. Intertidal, to 50 fms. 



Nephthys californiensis Hartman 



Nephthys californiensis Hartman, 1938, pp. 150-151, fig. 64. 



Collections.— 284-34, 871-38, 906-38, Ace. 587, Ace. 590. 12 speci- 

 mens. 



Distribution. — California ; Gulf of California. Intertidal, to 30 fms. 



Nephthys caecoides Hartman 



Nephthys caecoides Hartman, 1938, pp. 148-149, fig. 63. 



Collections.— 616-37, 876-38, 885-38, 886-38, 887-38, 888-38, 889- 

 38, 891-38, 892-38, 893-38, 894-38, 896-38, 897-38, 903-38, 905-38, 908- 

 38, 909-38, 913-39. Numerous specimens. 



Distribution. — California; Gulf of California. Intertidal, to 90 fms. 



