84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



front and tapers posteriorly. The prostomium is rounded as a semi- 

 circular lobe and divided into an anterior, broader part and a posterior, 

 much narrower though similar, part with 3 cirriform antennae. There 

 are no visible eyes. 



Parapodia are biramous and have the two rami wide apart. Notopodia 

 have a long, slender dorsal cirrus located at the inferior end of the 

 setal tuft. Branchiae are present from the fourth segment and continue 

 back through 7 segments. Acicula are yellow, straight, distally blunt and 

 subapically thickened. 



These specimens approach P. ambigua in having a rounded pros- 

 tomium and a greatly reduced caruncle. They differ in that branchiae 

 are present from the third, not fourth setigerous segment. P. ambigua 

 is previously known from the Pacific side of Panama in very shallow 

 ( 1 to 2 meters) depths. The present specimens are from East Cortes, 

 West Cortes, Velero and Long Basins, in depths of 899 to 1038 fms. 



Family EUPHROSINIDAE 



Genus EUPHROSINE Savigny, 1818 



Euphrosine paucibranchiata, new species 



(Plate 5, figs. 1, 2) 



Euphrosine sp. Hartman and Barnard, this volume, p. 52. 



A single specimen comes from Santa Cruz Basin (Sta. 3028). The 

 body is coiled like that of a pill-bug; it is ovigerous and estimated to 

 be about 8 mm long and 3.5 mm wide without, and 7 mm wide with, 

 setae. Segments number at least 15. The caruncle is a long, dark lobe; 

 it carries a short, pale, median antenna. Typical parapodia have slender 

 filamentous branchiae, each with single or at most 2 filaments, resembling 

 the long, slender dorsal cirrus; they are located at the upper, inner 

 end of notopodia. A ventral cirrus, similar in appearance, is located at 

 the lower end of neuropodia. 



The notopodium has transverse series of bifurcated setae in which 

 a much longer fang is ornamented with up to 15 serrations along its 

 inner edge; the much shorter fang is only about a third to a fourth as 

 long and smooth (Plate 5, fig. 1). These setae intergrade with others 

 in which serrations are almost lacking. Notopodial setae are much 

 coarser than neuropodial ones (Plate 5, fig. 2) but otherwise similar; 

 the shaft is more than twice as thick and the bifurcated tip is more 

 extensively serrated (Plate 5, fig. 1). 



