32 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
a shorter length, occurs irrespective of the individual’s TL (figs. 12, 
13, table 7). TL distribution among the two morphs differ only 
slightly and in the same direction and degree as morph A differs 
from morph B in adult males (table 8). P85 size distribution in stage 
IV males does not appear to be bimodal (fig. 14). 
rere 
3.0 
2.8 
2.6 
eaten pales be peestesteaeer 
2.4 
+ ice) @ 
aie ‘ 3 P5, Chela, Length of 
arr a Distal Segment (mm) 
One 
2.0 
Total Length, (mm) 
< . 
SS 
intersexes 
© O oO oO oO [e) (©) 
q i) T, Ta) © S 
P5 Length (mm) 
Ficure 14.—Labidocera diandra: at left scatter diagram comparing length of right leg 5 to 
total length in male A and female @, stages IV and V copepodites and stage VI female; 
in upper right, scatter diagram comparing length of distal segments of chela with total 
length in stage VI male (chela measured by planimeter from camera lucida drawing of 
posterior view; segment length determined along inner perimeter relative to mouth of 
chela; specimens selected at random from station F2). 
In the moult to stage VI, the terminal segment of right P5 divides 
to form the chela, the proximal segment becoming the thumb, the 
distal segment the finger. Assuming that the lateral spinous processes 
on this leg in stage V are homologous to setous-like spines in the 
adult chela, the proximal segment in the adult appears to be a fusion 
of Rel and Re2, while the distal segment comprises Re3. Immature 
stages of female and male P5 are compared in figure 9. 
