Vou.2]  Hsterly—Copepoda of the San Diego Region. 201 
curving dorsally, (fig. 48), a shorter straight dorsal spine, 
and a very short spine directed toward median line. On the left 
side the thorax is about as in the female. Abdomen with five 
segments, genital segment in some cases slightly asymmetrical ; 
orifice on right side; middle segment as long as the first two, 
and longer than the last two. Anterior antennae reaching to 
base of furca; joints 16 and 17 about of equal length; teeth 
on joint 18 directed toward distal end of antenna, those on the 
next joint larger and straight (fig. 481). Fifth foot, fig. 48e, f. 
A 18, 19.21. 
Fig. 48.—Labidocera trispinosa, n. sp. (a) Male, dorsal, X18. (b) Lat- 
eral portion of last thoracic segment from right side X60. 
(c) Head of male, lateral, x60. (d) Abdomen of female, 
dorsal, X60. (e) Left fifth foot of male. (f) Right fifth 
foot of male. (g) Fifth foot of female. (h) Joints 17, 18, 
19 to 21, 22, of grasping antenna of male, 160. 
