. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMF:RrCA. 319 the antorior portion with tlircc tuh(M-ck\s, tlic middle one rather hhmt and a little in advance of the others; a pointed tubercle with two lat- eral i-idges in front of the posterior notch; notch deej), with a small spine at the end. behind which is a pair of larger spines. Inner branch of the uropods flattened and not nearly reaching the tip of the caudal shield, the tip su})acute; outer branch very long, narrow, and incurved, extending consideral)ly behind the tip of the caudal shield and directed obliquely
. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMF:RrCA. 319 the antorior portion with tlircc tuh(M-ck\s, tlic middle one rather hhmt and a little in advance of the others; a pointed tubercle with two lat- eral i-idges in front of the posterior notch; notch deej), with a small spine at the end. behind which is a pair of larger spines. Inner branch of the uropods flattened and not nearly reaching the tip of the caudal shield, the tip su})acute; outer branch very long, narrow, and incurved, extending consideral)ly behind the tip of the caudal shield and directed obliquely upward. First antenna' a little shorter than the second, the first basal joint enlai'ged, oblong, and emarginat(> at the distal end at the insertion of the small, sulxpiadi'ate second joint; Hagelluiu longer than the peduncle and composed of nine to eleven joints. Second antenna^ scarcely reaching the middle of the thorax, the ])eduncle slender, the last two joints much longer than the pre- ceding ones; flagellum a little longer than the })eduncle. the joints furnislied with short sette. Thoracic legs increasing slightlv in leno-th posteriorly and furnished with short hairs; propodi armed below with spines: dactyls curved and ending in a spine with a strong spine behind the tip. "T\w ftMiiales are smaller than the males; the head, antenna', mouth parts, thoracic legs, and anterior segments are not distinguishable from those of the male, but the a])domen is markedly different. The caudal shield is relatively smaller and less sculptured; the notch at the ex- tremity is simple and shallow; there are three oblong tubercles on the anterior portion; the three tubercles on the next segment in front are smaller than in the male. The branches of the uropods are flattened and of subequal size; neither extends bej^ond the tip of the caudal ;—TToi>; CILIC^A CARINATA Richardson. (V/ic<r« cannata Richardson, American Naturalist, XXXIV, 1900, p. 224; Proc
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