208 University of California Publications. [ ZooLocy 
ment, about three times as long as broad, outer marginal bristle 
about three times as long as the furea. Anterior antennae 
extend to the posterior border of the fourth abdominal seg- 
ment. Second basal of mandible with two hooked bristles; inner 
ramus of maxilla with a minute bristle. Outer ramus of first 
pair of feet (fig. 50d) with one outer marginal bristle on the 
first joint, one on the second and two on the third; outer ramus 
of the second and third pairs, with one on the first joint, none on 
the second and two on the third; of the fourth pair with none 
Fig. 50.—Oithona plumifera. (a) Female, dorsal, X40. Th.5, fifth 
thoracic segment. (b) Abdomen of male X140. (c) Outer 
ramus of third foot of male X83. (d) Outer ramus of first 
foot of female X265. Se., outer marginal bristles.  St.. 
terminal bristle. 
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