134 University of California Publications. [ ZOOLOGY 
3. Eucalanus crassus Giesbrecht. 
Eucalanus crassus Giesbrecht, 1888, p. 333; 1892, pp. 132, 151; 
pl. 11, figs. 8, 10, 17, 21, 22, 38; pl. 35, figs. 4, 20, 26-28; 
1898, p. 22. 
Fig. 8.—Eucalanus crassus. (a) Fourth foot of female X83. (b) Head 
of female, lateral, X18. (c) Head of female, dorsal, X18. 
(d) Abdomen of female, ventral, 83. 
2 Genital segment (fig. 8d) much broader than long, onion- 
shaped ; between it and anal segment but one free segment. Fore- 
head (fig. 8c) flatly rounded, furea and second terminal bristle 
slightly asymmetrical. First two joints of outer ramus of poste- 
rior antennae fused, first joint of inner ramus shorter than 
second and about twice as long as broad. Inner ramus of man- 
dible reaches the distal margin of second basal; first joint of 
inner ramus with two bristles, second joint with four. Second 
lobe on inner margin of maxilla absent, third lobe with three, 
second basal with 4 bristles; first and second joints of inner 
ramus of posterior maxilliped with 3 bristles. 
& Secondary sexual characters not pronounced; right foot of 
fifth pair absent. 
Coloration: Transparent; there was no pigment in my speci- 
men. 
Length: Female, 3 mm. 
Occurrence: San Diego, June 16, 1904, one female. 
