114 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Distribution. — E. 7nutilata was originally described from Bermuda, 

 later reported from West Indian localities (Treadwell, 1921). The 

 present collections extend its known range into the eastern Pacific, from 

 Costa Rica, south to Colombia, and west to the Galapagos Islands. It 

 occurs in a bathymetric range of shore to 18 fms. 



?Eunice tridentata Ehlers 



Plate 7, Figs. 145-150 



Ehlers, 1905, p. 288, pi. 9, figs. 3-10; Augener, 1924, pp. 402-404, fig. 8. 

 ? Monro, 1933, pp. 63-64, fig. 26. 



? Leodice valens Chamberlin, 1918, p. 176; 1919, pp. 257-258, pi. 1, figs. 

 6-8. 



Collections.— 211 -Z^ (1) ; 245-34 (1) ; 444-35 (2) ; 970-39 (1). 



The surface epithelium has pale punctate spots over a darker, reddish 

 ground. Prostomial antennae are slightly, more or less regularly, articu- 

 lated, and short, about twice as long as the peristomium, or longer (coll. 

 217-34). Peristomial cirri taper, are similarly ringed with about 6 articu- 

 lations, and are about as long as the peristomium, or longer. Anterior 

 dorsal cirri are marked with about 3 rings. 



Branchiae are heavy, present from about the fourth parapodium with 

 7 filaments (coll. 217-34) ; by the fifth parapodium there are 8 filaments 

 and by the eleventh there are 10 filaments. Between parapodia 10 to 15, 

 where branchiae are best developed, there may be up to 13 (but in coll. 

 444-35, a tenth parapodium has a branchia of only 4, pi. 7, fig. 150) 

 filaments. At parapodium 38 there are only 5, and at the fifty-seventh 

 about 2 branches; from the seventy-second only single filaments occur, 

 and they are absent from about parapodium 84. 



Composite hooks are unique in that the distal fang is slender, tapers, 

 and the secondary tooth is small so as to appear almost absent (pi. 7, figs. 

 148, 149). A weakly developed guard, when worn away, gives the ap- 

 pearance of a tridentate condition. When the guard is unworn (pi. 7, 

 fig. 149), its point of attachment can be seen to accord with what resem- 

 bles a third tooth in others. In hooks that are much worn, secondary 

 teeth arc seemingly absent (pi. 7, fig. 148). Pectinate setae, at least 2 in 

 a fascicle, are present from at least the tenth parapodium, in the superior 

 part of the fascicle; they have a larger tooth at one end, but the dentate 

 edge is nearly straight. Acicula are black, taper distally, and are slightly 

 bent (pi. 7, fig. 145) ; setae and hooks are pale amber colored. Subacicu- 

 lar hooks are dark, heavy, distally bifurcated, but the secondary tooth is 

 smaller than the distalmost (pi. 7, figs. 147, 146) ; they occur singly in 

 parapodia, where present. 



