. Bulletin - United States National Museum. iles S of Fredericktown,27 paratypes, L. Hubricht, Apr. 21, 1938 (USNM and slide mounts of 2 paratypesin JRH). Diagnosis.—Rather closely allied morphologically with bothS. alabamensis and S. tenuis but distinguished from these species byhaving a few more spine teeth on gnathopodal propods, more sijineson uropods 1 and 2, and by presence of lateral spines on the distinguished from the former by having more posteriormarginal setae on gnathopodal propods and straighter posteriormargins of pereopod bases; and from the latter by having more
. Bulletin - United States National Museum. iles S of Fredericktown,27 paratypes, L. Hubricht, Apr. 21, 1938 (USNM and slide mounts of 2 paratypesin JRH). Diagnosis.—Rather closely allied morphologically with bothS. alabamensis and S. tenuis but distinguished from these species byhaving a few more spine teeth on gnathopodal propods, more sijineson uropods 1 and 2, and by presence of lateral spines on the distinguished from the former by having more posteriormarginal setae on gnathopodal propods and straighter posteriormargins of pereopod bases; and from the latter by having more pos-terior marginal setae on propod of gnathopod 1. Largest males, mm; largest females, mm. Male.—Antenna 1 up to 85 percent as long as body and up to 60percent longer than antenna 2; primary flagellum with up to 37segments; accessory flagellum a Uttle longer than 1st segment ofprimary flagellum. Antenna 2 with up to 12 segments in similar to those of S. alabamensis. 88 NATIONAL MUSEUM BULLETIN 2 59. Figure 21.—Stygonedes barri, new species. Male ( mm), seep, mile E. of Green-ville, Mo.: a,b, gnathopods 1,2; c, telson; d, uropod 3; e,f, uropods 1,2; g, coxal plate ofperepood 3; h-j, pereopods 5,6,7; k, abdominal side plates; l,m, antennae 1,2. Female( mm), same locality: n, uropod 3; o, telson; p, pereopod 4; q,r, gnathopods 1,2. SUBTERRANEAN AMPHIPOD STYGONECTES 89 Gnathopod 1: propod palmar margin deeply concave, armed with adouble row of about 9 spine teeth; posterior angle with 1 large spineand 5 smaller spines on outside, 5 small spines on inside; posteriormargin with 5 sets of setae; lateral setae few in number, mostly singlyinserted. Gnathopod 2: propod palmar margin deeply concave,armed with a double row of about 8 spine teeth; posterior anglewith 1 large spine and 4 smaller spines on outside, 4 small and 2medium-size spines on inside; posterior margin with 5 or 6 sets ofsetae; superior lateral setae triply, doubly
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