112 
carinate, separated from anterior orbital hoods 
by short shallow round-edged depressions. 
Orbital hoods not conspicuously inflated, 
rounded anteriorly. Frontal margin between 
orbital hoods and base of rostrum concave. 
Visible portion of first antennular article 
subequal to second; third article shortest. Tip 
of stylocerite reaching beyond tip of rostrum, 
almost to end of first antennular article. Lat- 
eral spine of scaphocerite about 1.1 times as 
long as squamous portion. Basicerite with 
acute spine. End of carpocerite greatly exceed- 
ing both scaphocerite and antennular pedun- 
cle; scaphocerite equal to or slightly longer 
than antennular peduncle. 
Large chela compressed, with smooth regu- 
lar margins and faces except for very slight 
concavity in upper margin proximal to articu- 
lation of dactylus and longer, more gradual 
concavity in lower margin below articulation 
of dactylus. Chela 3 times as long as broad, 
fingers about 0.3 length of chela. Finger 1.5 
times as long as greatest height. Merus of 
large cheliped 2.0 times as long as broad, su- 
perior edge distally rounded, inferior external 
edge rounded in basal portion, inferior inter- 
nal edge with small acute tooth distally. 
Small chela subcylindrical, almost 5 times 
as long as broad, fingers 0.5 length; shoulders 
at articulation of dactylus rounded. Carpus 
elongate, slightly over 0.3 length of chela. 
Merus 3.4 times as long as broad, similar in 
form to that of large cheliped but with inferior 
internal spine either poorly developed or 
lacking. 
Both large and small chelae sexually dimor- 
phic in size, large chela of male 1.3 times 
length of carapace, equal in female. Small 
chela with similar range; in addition, dactylus 
of male broader than that of female and bear- 
ing heavy fringe of bristles. 
Carpal articles of second legs with ratio 
10 : 10 : 5 : 5 : 8. 
Ischium of third legs with movable spine. 
Merus 5 times as long as wide, rounded dis- 
tally (in specimen drawn only left leg rounded 
distally, that of right leg with small acute 
PACIFIC SCIENCE, Vol. VII, January, 1953 
process distally). Carpus slightly over 0.5 as 
long as merus with neither distal angle greatly 
projecting or acute. Propodus about 0.8 as 
long as merus, with 6-8 spines. Dactylus 
simple, curved and elongate, 0.3 as long as 
propodus. 
Abdominal pleura of both sexes rounded. 
Telson 1.7 times as long as broad at base, 1.7 
times as broad near base as at tip. Proximal 
0.6 of telson broad, only slightly tapered; dis- 
tal 0.4 abruptly tapered anteriorly, gradually 
tapered posteriorly. Posterior margin almost 
straight. Paired dorsal spines 0.3 and 0.6 
of length from base. 
Length up to 14 mm. Body usually trans- 
lucent white with definite narrow transverse 
bands of red on abdomen and somewhat simi- 
lar bands, poorly defined, on thorax; bands 
across bases of antenna and antennules more 
definite; chelae with red mottling; eggs dark 
yellow in early stages, more greenish in ad- 
vanced stages. 
DISCUSSION: No marked variation in the 
specimens in the collection was noted, al- 
though a detailed study of the ratios of the 
parts of the appendages was not undertaken. 
Slight differences were noted, as would be ex- 
pected, in the proportions of the antennules, 
antennae, large and small cheliped (especially 
in the length-width relations of the merus, 
which varied from 1.8 to 2.7 times as long as 
broad), in the merus of the third legs, and in 
the telson. It should be noted that in the 26 
specimens of this variety in the collections the 
second article of the carpus of the second legs 
varied from 0.85 to 1.3 times as long as the 
first. The merus of the large cheliped was 
armed with teeth of varying size on the in- 
ferior internal margin, and the corresponding 
margin of the small cheliped often had a 
feebly developed tooth. However, in general 
the specimens were quite similar. 
This variety was separated from the parent 
species by Coutiere on the basis of three char- 
acteristics : first, the parent species has a small 
tooth at the articulation of the dactylus of the 
small cheliped, whereas the variety has none. 
