"Vol. 3] Esterljj. — Copepod Fauna. 63 



Occurrence: Two males, Coll. 1030. Type in the collection 

 •of the University of California. 



These animals are distinct from any males of the genus hith- 

 erto described, and may belong to some species described from 

 the female. I prefer to consider them new, especially since no 

 females were taken in Coll. 1030 that even remotely suggest a 

 relationship, although the shape of the head is like that of E. 

 tenuis. That species, however, was obtained in Coll. 1045. Pos- 

 sibly additional material will make it clear to what species the 

 animals belong. It is certainly as safe to make new species of 

 unknown males as to guess at relationships, in view of the sexual 

 dimorphism which extends to other structures than the fifth pair 

 of feet. 



Euchaeta dubia n. sp. 



PL 9, fig. 7; pi. 11, fig. 36; pi. 13, fig. 66; pi. 14, figs. 84, 85. 



]\rale : Head regularly rounded (PI. 9, fig. 7), without emi- 

 nence. Last thoracic segment roiuided laterally. Genital and 

 anal segments of equal lengths, second segment as long as the last 

 two : the genital segment has a low, rounded projection on the 

 dorsal border as seen in side view (PL 11, fig. 36). Anterior an- 

 tennae as long as the cephalothorax ; first foot with 3-jointed 

 outer ramus, first joint without outer marginal.- Third joint of 

 outer ramus of second foot with concave outer border between 

 second and third outer marginals; first outer marginal not reach- 

 ing base of second. Outer margin of the joint from base of second 

 marginal to base of third, two and one-half times as long as the 

 length of the former spine (PI. 13, fig. 66). Fifth feet (PI. 14, 

 figs. 84, 85) of the usual form, inner ramus of left foot very small, 

 about one-seventh the length of the first joint of the outer ramus. 

 The toothed projection at the end of the second joint is bifid at 

 the distal end, and the portion on the inner margin carries small 

 denticulations. 



Length : Male, 7.8 mm. 



Coloration : Without pigment, but furcal bristles are irides- 

 cent. 



Occurrence : Two males. Coll. 1030, two on the winter trip 

 to San Clemente. Type in the collection of the University of 

 California. 



