130 University of California Publications. | ZOOLOGY 
Sub-fam. EUCALANINAE. 
Eucalanina Giesbrecht, 1892, p. 45. 
2 Body elongate, head for the most part much lengthened 
(figs. 6a, b) and seldom distinct from the first thoracic segment. 
Rostral filaments slender, abdomen usually with three segments, 
seldom with four; furea often fused with the anal segment. First 
and second and eighth and ninth joints of anterior antennae 
fused. The swimming feet, and especially the rami, are short in 
comparison with the length of the body; inner ramus of first pair 
1- or 2- jointed, 3-jointed in the following pairs. Terminal bristle 
of outer rami with smooth edge, that of the first pair as in the 
succeeding three pairs; fifth pair absent or uniramous; if present, 
with from three to five joints. 
4 Body, especially the head, shortened (fig. 6c); anterior 
antennae without reduction in number of joints; furea as in the 
female. The mouth parts may be stunted. Fifth pair of feet 
not well developed, left foot uni- or biramous, right uniramous 
or lacking. 
1. Genus Eucalanus Dana. 
Calanus Dana, 1848, p. 11; 1849, p. 278. 
Eucalanus Dana, 1852, p. 1047. 
Eucalanus (in part) Lubbock, 1856, p. 13; 1860, p. 160. 
Calanella Claus, 1863, p. 174; not Eucalanus Claus, 1881, p. 325. 
Eucalanus Brady, 1883, p. 37. 
Eucalanus Giesbrecht, 1888, p. 333; 1892, pp. 46, 131, 739; 1895, 
p. 246; 1898, p. 19. 
Eucalanus Wheeler, 1899, p. 166. 
Anal segment and furea fused, latter asymmetrical; head 
triangular, often elongate, fused with thorax; abdomen short, 
that of female with three or four segments, of the male with 5. 
Anterior antennae longer than body, 23-jointed in female, term- 
inal bristles plumose and colored. Outer ramus of mandible 7- 
or 8- jointed and shorter than inner. Mandible of female longer 
than maxilla; second basal of mandible makes with the outer 
ramus a eylindrieal body on which the inner ramus articulates 
proximally to the outer ramus (fig. 7¢). Inner ramus of posterior 
maxilliped with long bristles. Swimming feet short; outer rami 
3-jointed, inner ramus of first pair 2-jointed, of second to fourth 
pairs 3-jointed. Fifth pair absent in female; in male (fig. 6d) 
