. Bulletin - United States National Museum. Wissenschaft. Ruderfußkrebse DER WOODS HOLE REGION 385 Die metasome, 5-segmentiert in der weiblichen; genitale Segment vergrößert aber wenig; Abdomen konischen erheblich; kaudale Rami kurze, nar-Row, auseinander. Erste Antennen 6-segmentierten; zweite Antennen 3-segmentiert, mit großen terminal Krallen; maxillipeds im normalen Posi-tion hinter den anderen Mund Teile. Kami des ersten Beine 1 - segmentiert, der drei folgenden Paare 3 - segmentiert; fünfte Beine uniramose, 1 - segmentiert. Eine Art. ANCHISTROTOS OCCIDENTALIS Wilson Abbildung 237 Anchistrotos occidentalis Wilson, Proc. U

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. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 385 the metasome, 5-segmented in the female; genital segment enlarged but little; abdomen tapered considerably; caudal rami short, nar- row, divergent. First antennae 6-segmented; second antennae 3- segmented, with large terminal claws; maxillipeds in normal posi- tion behind the other mouth parts. Kami of first legs 1-segmented, of the three following pairs 3-segmented; fifth legs uniramose, 1- segmented. A single species. ANCHISTROTOS OCCIDENTALIS Wilson Figure 237 Anchistrotos occidentalis Wilson, Proc. U. S. Nat. Mus., vol. 64, art. 17, p. 6, pi. 2, figs. 10-18, 1924. Occurrence.—Taken from the gills of the orange file fish {Alutera schoepfii) at Woods Hole. Distribution.—Not found outside the present area. Color.—B o d y a uniform yellowish white, becoming tinged with brown in preservatives; eye invisible; eggs white. Female. — Cephalic segment strongly arched dorsally and reentrant ventrally; fifth segment widened through the bases of the fifth legs and considerably wider than the genital segment. Of the four abdominal segments the basal one is the longest and the third one is the shortest; the caudal rami are widely separated and divergent, each with two unequal apical setae. The corrugated area forms a fingerlike process on the outer margin of the end segment of the second an- tenna; the terminal claw of the max- illipeds is long, slender, and sickle- shaped; the fifth legs are spatulate, with four apical setae. Total length, 1.75 mm. Male.—Unknown. Remarks.—This parasite, like its host, is evidently a straggler from farther south, and will only be found in very limited numbers. Suborder NOTODELPHYOIDA Fifth thoracic segment forming in the male a movable articulation with the fourth, but firmly attached to the sixth. In the female there is usually no movable articulation, the segments of both metasome and urosome in this region being rigidly fused and sup- port

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• bookdecade1870
• booksubjectscience
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