170 University of California Publications. [ ZooLoGy 
6. Scolecithrix similis T. Scott. 
Amallophora dubia var. similis Scott, T., 1893, p. 56, pl. 4, figs. 
19-23. 
Scolecithrix similis Giesbrecht, 1898, p. 46. 
S. similis (?) Wolfenden, 1904, p. 119, pl. 9, figs. 5, 6. 
Fig. 31.—Scolecithriz similis. (a) Male, lateral, X31. (b) Fifth foot, 
male, X45. 
4 First abdominal segment short, second long, twice the 
length of the third, which is shorter than the fourth. Right 
anterior antenna 18-jointed, left 23-jointed (Scott). Last two 
thoracic segments fused. First basal of fourth foot with a 
plumose inner marginal bristle; both feet of fifth pair biramous 
(fig. 310). 
Length: Male, 2.6 mm. 
Occurrence: San Diego, June 23, 1904. 
The antennae of the single specimen were broken, but the 
| 
rd 
form of the abdomen and fifth feet warrant one in identifying 
it with Scott’s species, at least provisionally. 
Fam. CENTROPAGIDAE. 
Centropagidae Giesbrecht, 1892, p. 58; 1898, p. 52. 
2 Head always distinct from thorax; rostrum with two, usu- 
ally soft, filaments, sometimes plumose. Anterior antennae as 
in the Calanidae, but the second joint is more often divided into 
two parts, never less than twenty-three joints. Outer ramus of 
posterior antennae at least 24 as long as the inner. The suc- 
ceeding four pairs of appendages as in Calanus and like forms. 
In the three anterior ones are found peculiarities (in the Hete- 
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