Vot.2] Esterly—Copepoda of the San Diego Region. 161 
First outer marginal lobe of the maxilla (fig. 25f) with eight 
bristles, second basal with three, fused second and third joints 
of the inner ramus with four. Outer border of first joint of 
outer ramus of first foot concave; outer border of third joint of 
second pair and its outer bristles different than in the following 
pair. 
nor: S! 
let lth rsd 
Fig. 25.—Euchaeta media. Female. (a) Lateral, X18. (b) Head, lateral, 
X83. (c) Genital segment, dorsal, X45. (d) Genital seg- 
ment, from right side X45. (e) Second foot X83. (f) Max- 
illa X83. Le.1, first lobe of outer margin. Li.1, first lobe of 
inner margin. Ri.2, 3, fused second and third joints of inner 
ramus, bristles not shown. (g) Furea, dorsal, X45. Si., inner 
marginal bristle. 
4 Unknown. 
Coloration: Rather transparent; there is no pigment in the 
preserved specimens I have seen. 
Length: Females average about 3.3 mm. 
Occurrence: Forty or fifty females, many with eggs, were 
taken December 23, 1903, on the ‘‘Banks’’ with males of EL. 
