128 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



sefiada, Mexico, shore (1) ; A 25-39 (2) ; A 30-39 (7) ; A 50-39 (1). 



Branchiae are first present usually from segments 28 to 40 to near 

 the posterior end; they attain to 6 or 7 filaments, subpalmately to sub- 

 pectinately arranged on the stem. Acicula are black, usually 3 (or only 

 2) in a parapodium. Subacicular hooks (pi. 8, fig. 182) are inconspicu- 

 ous, usually absent except for a short posterior region, occur singly in 

 parapodia; they are much slenderer than their respective acicula and 

 terminate distally in a bidentate tip. A typical posterior neuropodium is 

 provided with 3 black acicula (pi. 8, fig. 180), 5 coarsely pectinate setae 

 (pi. 8, figs. 181, 183), over 20 finely pectinate setae, about as many 

 limbate setae, and approximately 15 pointed, composite setae (pi. 8, fig. 

 179). 



I agree with Monro (1933, p. 69) that M. calif ornica Moore 

 (1909) is identical with M. sanguinea, and would suggest also that sev- 

 eral others, in the list above, are perhaps the same, including M. aran- 

 sensis, AI. brevitentaculata, M. languida, M. nobilis, M. acicularum and 

 its variety brevibranchiata, and M. viridis. A re-examination of types is 

 desirable. 



Distribution. — M. sanguinea is world wide in occurrence, especially 

 in warmer seas; it abounds in intertidal and littoral zones. It inhabits 

 especially shaly rocks or hard-packed clays. These records include locali- 

 ties in the gulfs of California and Mexico, and in the eastern Pacific 

 from southern California to Ensefiada, Mexico. 



Marphysa aenea (Blanchard) 

 Plate 8, Figs. 184-188 



M. corallina Ehlers, 1901, pp. 131-134, pi. 15, figs. 13-18. 

 Augener, 1923, pp. 64-65; Monro, 1933, pp. 67-68. 



Collections. — La Libertad, Ecuador, Jan. 20, 1933 (1) ; 4-33 (1) ; 

 380-35 (3) ; 391-35 (4) ; 634-37 (1) ; 782-38 (fragment) ; 831-38 (2) ; 

 844-38 (3). 



A large specimen (coll. 831-38) measures about 375 mm long (pre- 

 served). Branchiae are first present from segment 16 to 23, continued 

 posteriorly nearly to the end; the last 12 segments may be abranchiate. 

 The filaments number 7 to 10 where best developed; they are in pecti- 

 nate arrangement. Acicula are dark, number one or 2 in a parapodium; 

 subacicular hooks are pale brown, first present in about the fortieth seg- 

 ment, and are continued posteriorly to the end, number usually one or 2 

 in a parapodium; they are distally distinctly bidentate (pi. 8, fig. 186). 

 A typical neuropodium from a postmedian segment has approximately 



