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6 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
copepodid chalimus I chalimus IT chalimus IIT 
leg seg. exo. end, ezo. end. exo. end. exo. end. 
1 Ht 1:0 0:0 1:0 0:0 1:0 0:0 1:0 0:0 
2 Vid 3 IV:3 3 LVi33 3 Waste 3 
2 1 Meal 0:1 ial O:1 leit 0:1 Weil On 
2 IV:5 7 IV:5 8 IV:6 8 IV:6 8 
3 1 1:0 0:1 itaal 0:1 es Ost Hleentt 0:1 
2 IIl:4 4 IV:5 5 Ves 5 6 IV:5 6 
4 1 VERS O31 EO 0:1 Jia (eal Jigal 0:1 
2 3 EVis5 4 LVS Is IV:5 5 
Leg 5 (fig. 22) consists of single stout spine and three short plumose 
setae at notch in margin of genital segment (an increase of one seta 
over previous stage). Leg 6 a short spinelike process with plumose 
seta near junction of abdomen and genital segment. 
The lengths in mm of each of the free body segments for the last 
five developmental stages of the male are as follows (specimens 
measured along mid-dorsal, anterior-posterior axis): 
chalimus chalimus chalimus 
I II IIT 
copepodid adult 
cephalon 2.4 2. 6 SH 3. 6 5. 3 
first free thoracic segment 9 .6 G a) .9 
second free thoracic segment 7 .6 8 8 12 
third free thoracic segment 9 .8 9 209) 1.3 
genital segment 1.3 1.4 Ieee 2.3 3. 8 
abdomen 3 .3 5 1.0 1.4 
caudal ramus 1 .6 8 At) 2.0 
total body length 6. 6 6. 6 8167) 084 15.9 
CHALIMUS III, MALE.—Body form as in figure 23. Total length 10.4 
mm, greatest width 4.9 mm (measurements based on single specimen). 
This form is ornamented in all respects like chalimus JI. There is 
a general increase in size and further elongation of genital segment. 
Cephalic appendages show elongation of terminal segments when 
compared with previous stage (claw of second antenna, maxilliped 
and terminal segment of first antenna are proportionally longer). 
Other than subtle changes in proportions, appendages are the same 
as in chalimus IJ. For comparison of legs 1-4, see plates 1-4. 
ApuULT MALE.—Total length 15.9 mm, greatest width 7.2 mm 
(measurements based on one specimen). The appendages of the adult 
do not differ significantly from the previous stage except for subtle 
changes in lengths of terminal segments of cephalic appendages, 
the adult appendage is somewhat longer in proportion (compare adult 
first maxilla, fig. 24 with fig. 16). The maxilliped of the adult male 
(fig. 25) bears two striated pads opposing the claw instead of just one 
as in previous stages. 
Changes in ornamentation and proportionate lengths of the segments 
of the first antenna of all stages of the male are as follows: 
