. Bulletin - United States National Museum. Science. GAMMARIDEAN AMPHIPODA 189. Figure 49.—Lysianassa macromerus (Shoemaker), female, mm., station 39-K^i: a, pereopod 2; b, uropod 1; c, uropod 2; d, uropod 3; e, telson. dimensions (not shortened as in Arugella heterodonta Pirlot); gnathopod 2 chelate; a large striated spine present on posterodistal end of article 6 of pereopods 1-2; pereopods 3-5 rather short, second articles un- usually asymmetrical and broad, fourth articles broad, each with long posterior process nearly reaching end of article 5; article 5 about half as long as article
. Bulletin - United States National Museum. Science. GAMMARIDEAN AMPHIPODA 189. Figure 49.—Lysianassa macromerus (Shoemaker), female, mm., station 39-K^i: a, pereopod 2; b, uropod 1; c, uropod 2; d, uropod 3; e, telson. dimensions (not shortened as in Arugella heterodonta Pirlot); gnathopod 2 chelate; a large striated spine present on posterodistal end of article 6 of pereopods 1-2; pereopods 3-5 rather short, second articles un- usually asymmetrical and broad, fourth articles broad, each with long posterior process nearly reaching end of article 5; article 5 about half as long as article 6; pleonal epimera 1-2 each with small tooth at posteroventral corner, third epimeron slightly convex posteriorly, rounded-quadrate at ventral corner, epimeron not prolonged posteri- orly as in Aruga oculata Holmes; inner ramus of uropod 2 with marginal constriction; uropod 3 short, peduncle scarcely lamelliform, outer ramus equal to peduncle in length, uniarticulate, inner ramus about two thirds as long as outer ramus; telson entire, slightly convex apically. Material.—cayucos: Phyllospadix-peivetiid grid, rare (6 per sq. m.). hazard canyon: algal turf on platform, rare (6 per sq. m.). goleta: Phyllospadix-peivetiid grid, second most abundant species (1588 per sq. m.). pt. dume: short brown algae, fourth most abundant species (1020 per sq. m.); coralline algae, fifth most abundant species (1285 per sq. m.); pelvetiids, scarce (18 per sq. m.); short greenish brown algae, fourth most abundant species (176 per sq. m.); Phrag- matopoma masses, scarce (73 per sq. m.); loose rocks, most abundant species; Egregia holdfasts, second most abundant species; in bed of Aiithopleura elegantissima, very abundant, corona del mar: Phyl- lospadix-cor&Hine grid, scarce (28 per sq. m.); loose rocks, moderately abundant, la jolla: sand-inundated algae at high tide line, fifth most abundant species (367 per sq. m.). Distribution.—Cayucos, California, to La Jolla, especially abun- dant in
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