90 U.S. NATIONAL MUSEUM BULLETIN 2,5 8 



cystis holdfast, 3 m., rare. pt. dume: brown algal turf, 3rd most 

 abundant species (1450 per sq. m.) ; coralline algae, 3rd most abundant 

 species (1390 per sq. m.); Phragmatopoma mass, moderately abundant 

 (88 per sq. m.) ; on Amaroucium sp., abundant; loose rocks, moderately 

 abundant; Egregia holdfasts, scarce; on Anthopleura sp., rare; sandy 

 social tunicates, most abundant species, corona del mar: Phyllo- 

 s^acfe-coralline grid, 5th most abundant species (438 per sq. m.) ; loose 

 rocks, very abundant (166 per sq. m.) ; calcareous worm tubes, very 

 abundant; soft polychaete tubes, very abundant; Laminaria holdfast, 

 abundant; Phragmatopoma masses, very abundant; tunicates, very 

 abundant, la jolla: P hyllospadix-cor alline grid, moderately abundant 

 (408 per sq. m.) ; underrock grid, moderately abundant (60 per sq. 

 m.) ; red algal ridge, scarce (73 to 87 per sq. m.) ; sand-inundated algae 

 at high tide line, 3rd most abundant species (1910 per sq. m.) ; sponge, 

 rare; red algae, rare. 



Distribution. — Puget Sound, Washington to Bahia de San 

 Quintin, Baja California, 0-180 m.; Japan. One of the most abundant 

 amphipods, especially in the Phyllospadix-Tpelvetiid-coraWme zones; 

 occurring densely in many other sample sets and rarely in still others; 

 despite its ubiquity in the study area it should be considered a cold- 

 temperate species of the Oregonian province; it is somewhat eurybathic 

 in view of its occurrence on soft bottoms of the coastal shelf of southern 

 California to depths of 180 m. 



Lembos concavus Stout 



Lembos concavus Stout, 1913, pp. 651-653. — Shoemaker, 1941b, p. 187.— J. L. 

 Barnard, 1962a, pp. 7-9, fig. 2. 



Material. — goleta: Macrocystis holdfast, 3 m., abundant. 



Lembos ?macromanus (Shoemaker) 



IBemlos (Lembos) macromanus Shoemaker, 1925, pp. 36-41, figs. 10-13. 

 Lembos macromanus: J. L. Barnard, 1962a, p. 9, fig. 3. 



Specimens closely resembling those described by Shoemaker have 

 been collected at Bahia de Los Angeles, Baja California, and figured 

 in Barnard (1968). Individuals occurring along the coasts of 

 Baja California and California north of Bahia de San Quintin may 

 be referrable to this species but they are not as fully developed as those 

 described by Shoemaker. Adults reach a larger size than those from 

 the Gulf of California, but the male first gnathopod is retarded 

 morphologically. Possibly Lembos concavus Stout is a senior synonym 

 of this species, but J. L. Barnard (1962a) found a specimen matching 

 Stout's incomplete description. It appears to have a short cusp at the 

 posterior palmar edge of male gnathopod 1. The cusp fails to extend 

 to the palmar tangent. That specimen may be an aberrant member of 

 L. macromanus, but it differs from the latter in the setosity of article 



