108 
PACIFIC SCIENCE, VoL VII, January, 1953 
rostrum convex dorsally. Orbital hoods hemi- 
spherical. Depression between lateral margins 
of orbital hoods and portion of carapace 
above base of antennae. 
Antennular peduncle with second article 1- 
2 times as long as visible portion of first arti- 
cle; third article equal to or somewhat longer 
than visible portion of first; second article 1.5- 
2.0 times as long as broad. Short lateral spine 
of stylocerite reaching nearly 0.7 length of vis- 
ible portion of first article. Basicerite almost 
always bearing thin, acute lateral spine. Sca- 
phocerite, antennular peduncles, and carpo- 
cerite subequal in length, all variable, but car- 
pocerite almost always slightly longer. 
Large chela of male subcylindrical, usually 
slightly compressed, entire and smooth, ta- 
pering toward fingers. Entire chela about 4 
times length of fingers and about 2.5 times 
its greatest height. Chela rotated, with dac- 
tylus lateral in position. Merus about 1.5 
times as long as wide, with superior distal 
angle not greatly produced; inferior internal 
margin usually with strong acute tooth dis- 
tally. Chela relatively shorter and thinner in 
female than in male. 
Small chela of male with dactylus expanded, 
about twice as long as broad, with dense 
fringe of short setae on margin; fingers slight- 
ly shorter than palm; height of palm slightly 
over 0.3 length of chela. Merus twice as 
long as wide, about 0.7 as long as chela, with 
all distal angles rounded. In female dactylus 
narrow, 3 times as long as broad, uniformly 
tapering; palm about 1.5 times as long as fin- 
gers; chela slightly over 3 times as long as 
high; merus thinner than in male. 
Ratio of carpal articles of second legs vary- 
ing thus: 10 : 9-13 : 2.9-4.7 : 2.9-4.7 : 6.3- 
10.0 (see Fig. 37). 
Ischium of third legs armed with short 
strong movable spine. Merus 3. 1-3. 5 times as 
long as wide, with strong tooth distally on 
inferior margin. Carpus prolonged distally on 
inferior border as rounded tooth, otherwise 
unarmed. Propodus broad and flattened, with 
9-11 movable spines along inferior margin. 
Dactylus simple, curved. Fourth legs similar 
to third legs except meral tooth less pro- 
nounced. 
Telson with sides of uniform taper 2. 2-2. 9 
times as long as width of posterior margin, 
greatest breadth 1.3-2. 2 times as wide as pos- 
terior margin. Pairs of dorsal spines about 0.4 
and 0.7 distance from articulation. Posterior 
margin between posterolateral spines arcuate, 
with about 10 small spinules; inner branch of 
uropod similarly with spinules along distolat- 
eral margin. 
Mature specimens usually reaching maxi- 
mum length of 18 mm.; one female, however, 
23 mm. long. Color of live specimens variable, 
body transparent, covered dorsally with red, 
yellow, and blue chromatophores in reticu" 
lated pattern; abdomen with reticulations in 
transverse bands; legs usually transparent; 
large chela with more red and blue chromato- 
phores than body; eggs bright green. 
DISCUSSION: Like C. parakyone and C. brevP 
pes, this species shows great variation in many 
characteristics. Some 10 specimens were 
studied intensively to determine the range of 
variation; unfortunately, time did not permit 
the making of the complete series of measure- 
ments for the almost 100 specimens available. 
The specimens not measured, however, were 
all examined to determine any marked varia- 
tion. 
The ranges of variation of the frontal region 
of the carapace, of the antennular and antennal 
peduncles, of both chelipeds, of the third legs, 
and of the telson either have been given in the 
description or are shown in Figures 38 and 39- 
The range of variation of the second legs is 
given in the description and shown graphical- 
ly in Figure 37. A few additional variations are' 
noteworthy: The lateral spine of the basicer- 
ite, usually well developed, is sometimes re- 
duced or absent. The large chela, already 
noted as sexually dimorphic, also varies from 
almost circular in cross section to distinctly 
compressed. The merus of the large cheliped 
almost always carries a well- developed tooth 
on the inferior internal margin, but in some 
