NO. 3567 LABIDOCERA JOLLAE GROUP—-FLEMINGER 13 
measurements, excluding caudal setae, of specimens selected at ran- 
dom are as follows: 
Prosome-Urosome Length 
Total Length (mm) Ratio 
no. mean range st. dev. median range 
adult @ 54 2.66 2.18-2.97 0.152 4.3:1 3.6—-5.0:1 
adult o 61 2.10 1.91-2.30 0.089 3.0:1 2.8-3.6:1 
st. V cop. ? 6 1.99 1.90—2.07 4.2:1 4.0-4.6:1 
st. V cop. @ o 1.75 1.63-1.88 3.4:1 3.2-3.6:1 
Draenosis.—An allopatric twin species of L. jollae, morphologically 
similar in general features, but showing several constant differences 
in sexual structure. The name kolpos [Greek] refers to the geograph- 
ical region (Gulf of California) inhabited by the new species. 
Adult female: Greatest width of TV, in dorsal view, approximately 
equal to greatest width of preceding segment (fig. 3f). TV corners 
weakly flared, maximum width between corners about 15 percent less 
than that in jollae of equal prosome length (fig. 4d). P5 with vestigial 
endopod perfectly fused to B2 (figs. 37, 1). Mandibular gnathobase 
with cusps of median teeth rounded at apex (fig. 3k). Spermatophore, 
in lateral view, with left and right lobes low, closely appressed to 
dorsolateral portions of genital segment, lobes not extending beyond 
dorsal limit of genital segment (figs. 3g-i); in jollae lobes larger and 
not flattened but extending conspicuously above genital segment. 
Rostrum as in jollae (fig. 10c). 
Adult male: Chela of right P5 similar in form but smaller in pro- 
portion to protopodite and left ramus than in jollae; shortest length 
of distal segment, measured along imaginary straight line between 
proximal and distal ends, excluding spine, equal to lengths of B2 plus 
half of B1 (fig. 3c); in jollae this width equal to total length of both 
segments of protopodite. Inner circumference of chela about half 
the length of that in jollae, although protopodite only slightly smaller 
(fig. 5). In closed chela, apex of distal segment crosses proximal 
segment near articulation with B2 between weak swelling and stout 
lateral prong. Rostrum as in jollae (figs. 3n, 10c). 
Right Al (fig. 3a) in dorsal view with segment 17 almost twice as 
long as wide, mean of ratio W/L=0.57, range .50-.64 (22 specimens), 
anterior edge produced in shallow ridge; ridge more weakly sculp- 
tured than in jollae; segment 18 with two rows of teeth as in jollae; 
fusion segment 19-21 with row of small denticles extending about 
half length of total segment; segment 19-21 about one and one-half 
times length of segment 18. Compared with jollae, length of segment 
17 is slightly greater, length of segment 18 is slightly less, length of 
segment 19-21 is considerably less (figs. 4a-c). 
ADDITIONAL DESCRIPTION.—L. jollae and kolpos share the fol- 
lowing characters: Female Al and male left Al with 23 perfectly 
