132 University of California Publications. — [ZooLocy 
ond lobe of inner margin of maxilla present, third lobe with four, 
second basal with 5 bristles. First joint of inner ramus of pos- 
terior maxilliped with 3 bristles, second with 4. 
Fig. 6.—Eucalanus elongatus. (a) Female, dorsal, X15. (b) Female, 
lateral, X15. (¢) Head of male, dorsal, X37. (d) Fifth 
foot of male, X40; left foot at left of figure. 
4 Pronounced secondary sexual characters; right fifth foot 
present, left as long as the fourth foot exclusive of terminal 
bristle. 
Coloration: Very transparent, with a small though varying 
amount of red in the body, usually limited to a single oil-drop 
near the posterior end of the thorax. (See note also.) 
Length: Female, 4.4-7.5 mm.; male, 4 mm. 
Occurrence: A very common species, present in practically 
all hauls with the 000 net, both in winter and summer. 
The most numerous specimens belong to a variety of E. elongatus as in 
Giesbrecht’s monograph (1892), in which the last thoracic segment is 
rounded instead of pointed. But Giesbrecht, 1895, p. 246, calls attention to 
this difference. The typical form with pointed thoracic segment occurs in 
the San Diego region, and so far one specimen has been taken, a female, 
length 7144 mm. The bristles on the posterior maxillipeds and the maxilla 
are faintly orange, those on the feet a rich orange, as far as seen, the feet 
being badly broken. 
