Vou.2] EKsterly—Copepoda of the San Diego Region. 199 
eye strongly protruding (fig. 48c). Abdomen with from one 
to three segments, never symmetrical. Anterior antennae 16- 
to 24-jointed, at least two terminal joints fused, usually also a 
number of proximal joints. Posterior antennae with reduced 
number of terminal joints in outer ramus which is often more 
slender and thinner than the inner ramus. Mandible as a 
whole as in Centropages, blade with at least five teeth. Maxilla 
with relatively large proximal basal, second inner marginal lobe 
large, second basal, rami and first outer marginal lobe accord- 
ingly relatively smaller. Anterior maxilliped as in Centropages, 
with very strong hooked bristles; posterior maxilliped short, 
first basal with indented or folded inner margin, set with long, 
strong bristles; inner ramus 3- to 5-jointed, bristles short. Outer 
ramus of four anterior feet 3-jointed, inner ramus of second 
to fourth pairs or of all 2-jointed. Basal of fifth pair 2-jointed, 
inner and outer rami usually 1-jointed; outer ramus seldom 
2-jointed. 
& Sexual peculiarities in form of body, more often in eyes, 
anterior antennae and fifth foot. Last thoracic segment as a 
rule asymmetrical, right posterior angle more strongly de- 
veloped; abdomen with 5 segments, in cases with asymmetrical 
processes on right side. Right anterior antenna with broadened 
middie joints; beyond the geniculation either the nineteenth 
and twenty-first joints only are fused (besides the twenty-fourth 
and twenty-fifth) or also the twenty-second and twenty-third: 
fifth foot without inner ramus (perhaps a rudiment on left 
foot), four jointed on each side, the right foot with forceps. 
1. Genus Labidocera Lubbock. 
Pontella (part) Dana, 1846, p. 184; 1848, p. 26; 1849, p. 280. 
Pontellina (in part) Dana, 1852, p. 1135. 
Labidocera (sub-genus) Lubbock, 1853a, p. 25; 18530, p. 202. 
Pontella Claus, 1863, p. 207; 1893, p. 233. 
Pontella Brady, 1878, p. 73; 1883, p. 87. 
Pontella Thompson, 1887, p. 34. 
Labidocera Giesbrecht, 1889, p. 7; 1892, pp. 70, 444, 746; 1897, 
p- 254; 1898, p. 132. 
Labidocera T. Scott, 1893, p. 82. 
Labidocera Wheeler, 1899, p. 178. 
