122 University of California Publications. | ZooLoGy 
Fam. CALANIDAE. 
Dana (subfamily), 1852. 
Claus, 1868, p. 166. 
Giesbrecht, 1892, p. 41; 1898, p. 12. 
First antennae of male symmetrical or nearly so, not genicu- 
late; aesthetasks more numerous than in female. Fifth feet of 
female either like the preceding ones or in various stages of 
degeneration, often resulting in complete loss. The males vary 
from the females in the segmentation and form of abdomen, in 
structure, number of joints, and appendages of the anterior 
antennae, and in the form of the fifth foot. Head usually dis- 
tinct from thorax; the two last thoracic segments usually fused. 
Rostrum with one or two joints, sometimes lacking. Abdomen 
of female usually with 4 (fig. la), seldom with 3 or 2 segments; 
that of the male with 5, often with very short anal segment. 
Anterior antennae of female, 16- to 25-jointed. Outer ramus of 
second antennae one-half to four times as long as the inner, 5- to 
8-jointed, middle joints short, end ones usually elongate. Six 
to eight teeth on blade of mandible, outer ramus 5-, inner ramus 
2-jointed. Maxilla with at least two lobes on inner margin and 
one on outer; outer ramus always present, inner 1- to 3-jointed, 
seldom fused with second basal. Proximal and distal curved 
bristles of first maxilliped usually equal in length, the former 
sometimes modified into delicate saclike appendages (fig. 300). 
Second maxilliped elongate, terminal portion (inner ramus) 5- 
jointed, from one-third to one and one-half times the length of the 
second basal. Outer rami of first to fourth feet 3-jointed (that 
of first foot occasionally 2-jointed) ; inner ramus of first and 
second pairs 1- to 3-jointed, of third and fourth 3-jointed; term- 
inal bristle of outer rami at times with smooth border (fig. 1d), 
not serrate. Inner rami of fifth pair of male rarely 3-jointed, 
mostly rudimentary or lacking; the outer ramus forms hooks 
or shears; occasionally the entire appendage of one side may be 
absent. 
Sub-fam. CALANINAE. 
Calanina Giesbrecht, 1892, p. 44. 
Fifth pair of feet in the female in all respects like the pre- 
ceding pairs; in both sexes all five pairs are provided with 3- 
