. Fig. I. Piomachociiims kcrguelensis. aj_2, long and short cirri of a specimen with cirri of short segments, X 1-25. a3_4, the same of a specimen with cirri of long segments, x 1-25. b, distal segments of a short cirrus, X9. Strong, in the distal segments. All but the basal segments are compressed from side to side, the distal most strongly. The small apical cirrus of the same specimen, a,, is of 24 segments and 15 mm. long. The basal segments, the first two or three, are broader than long; the proximal are longer than broad but not nearly so much so as in the long cirri. The distal segments

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. Fig. I. Piomachociiims kcrguelensis. aj_2, long and short cirri of a specimen with cirri of short segments, X 1-25. a3_4, the same of a specimen with cirri of long segments, x 1-25. b, distal segments of a short cirrus, X9. Strong, in the distal segments. All but the basal segments are compressed from side to side, the distal most strongly. The small apical cirrus of the same specimen, a,, is of 24 segments and 15 mm. long. The basal segments, the first two or three, are broader than long; the proximal are longer than broad but not nearly so much so as in the long cirri. The distal segments are as broad as long and have the dorsal projection more strongly developed and more keel- like than do those of the larger cirri. The more elongated cirrus, from another specimen, shown in Fig. i (jg, is of 51 seg- ments and nearly 100 mm. long. The first two segments are broader than long, the third

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