VoL.2] Esterly.—Copepoda of the San Diego Region. 185 
Papilla on front of head elongated but not ending in a point 
(figs. 380, c). Anterior antennae when at the sides of the body 
reach about to the end of the furea. Fourth lobe of the anterior 
maxillipeds (fig. 389) with two long, thick bristles and a shorter, 
thinner one, which is over half as long as the others; fifth lobe 
with two bristles of about equal length and thickness. On the end 
of the inner border of the first basal of the posterior maxilliped 
is a spine-like bristle, which is hardly one-eighth as long as the 
bristle in the middle of the margin, and the latter one is almost 
twice as long as the second basal (ef. fig. 37b). Hooks at the 
end of both outer rami of the fifth foot in the male relatively 
shorter than in spinifrons; the left little longer than the first 
and second joints of the outer ramus together. 
Coloration: As in spinifrons. 
Length: Female, 2.2 mm.; males slightly smaller. 
Occurrence: A few specimens of both sexes were taken during 
May and June, 1904. 
3. Heterorhabdus clausi Giesbrecht. 
Heterochacta claus Giesbrecht, 1889, p. 2; 1892, pp. 372, 382, pl. 
20, fig. 2, 28, 37, 38. 
Heterorhabdus clausi Giesbrecht, 1898, p. 115. 
Fig. 39.—Heterorhabdus clausi. Fifth foot, male, 82. 
