Vou.2]  Esterly—Copepoda of the San Diego Region. 129 
5. Calanus robustior Giesbrecht. 
Calanus robustior Giesbrecht, 1888, p. 332; 1892, pp. 91, 129; 
pl. 7, figs. 15, 19, 25, 30; pl. 8, fig. 34; 1898, p. 18. 
Calanus comptus Scott, T., 1893, p. 26, pl. 5, figs. 46-50; pl. 6, 
figs. 1-5. 
b 
b2. Sj rid. 
Fig. 5.—Calanus robustior. (a) Female, lateral, X36. (b) Outer mar- 
gin of first basal of anterior maxilliped of female >< 140. 
(c) Genital segment of female, lateral, X83. (d) Inner 
ramus of second foot of female 185. B.2, second basal 
of foot. Ri.1, first joint of inner ramus. Si., inner mar- 
ginal bristle. 
Allied to C. gracilis, but in the female the ventral surface of 
the genital segment is much more convex (ef. figs. 4a and 5c), 
and the first basal of the anterior maxilliped has a bulging 
protrusion on the outer border (ef. figs. 4b and 5d). 
4 Bristles on anterior maxilliped longer than in C. gracilis, 
inner ramus of left fifth foot stylet-like, jointed and without 
bristles, outer ramus much elongated. 
Coloration: As in C. gracilis. 
Length: Female, 3.17 mm. 
Occurrence: San Diego, July 14, 1903, one female; December 
21, 1904, December 29, 1904, one female each day. 
