. Bulletin - United States National Museum. Science. 28(3 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. specimens have three strong pkimose sette and one that is feeble on the inner plate, and nine spines on the outer plate of the first maxillae. The terminal abdominal segment in Stebbing-\s specimens has the sides near the apex incurved. In the Florida specimens the sides are straight. The outer branch of the uropoda in xS. destructor has four teeth on the exterior margin, and a slight indication of a fifth in some speci- mens. There are never six teeth, and the fifth one is never well develope
. Bulletin - United States National Museum. Science. 28(3 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. specimens have three strong pkimose sette and one that is feeble on the inner plate, and nine spines on the outer plate of the first maxillae. The terminal abdominal segment in Stebbing-\s specimens has the sides near the apex incurved. In the Florida specimens the sides are straight. The outer branch of the uropoda in xS. destructor has four teeth on the exterior margin, and a slight indication of a fifth in some speci- mens. There are never six teeth, and the fifth one is never well developed and strong as the four, which are constant in size and luim- ber. Stebbing says that this number is also found in the Ceylon specimens, the precise number being immaterial, but later, in pointing- out the affinity of Sphxroma felix Lanchester, with the species in question, refers to the outer ramus in Sphcvroma felix as having eight small teeth on the outer margin, this being a character to be consid- ered in separating the species. The second, third, and fourth segments of Sj)hxronia destructor are each (crossed by a transverse ridge. In Stebbing's specimens onl}' the fourth segment has a transverse ridge. The apical tooth of the mandibles is sub-biliTl in the Florida specimens. SPHiEROMA PENTODON Richardson. Spharromapentodon Richardson, Harriman Alaska Exp. Crust., X, pp. 214-215; Proe. U. S. Nat. Mas., XXVII, 1904, pp. 659-660—Holmes, Proc. Cal. Acad. Sciences (3), III, 1904, pp. 323-324, pi. xxxvii, fig. 43. Localities.—Sausalito, San Francisco Bay, California. Found in mud flat. Body elliptical in outine; color dai'k brown; sur- face minutely but densely granular. Head situated transversely, with a prominent ridge on the anterior margin. Eyes placed post- laterally, and composed of many ocelli. First pair of antennfe extend to the posterior margin of the head; flagellum eight-jointed. Second pair of an- tenn;e reach the middle of the second thoracic seg- ment; flage
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