66 
PACIFIC SCIENCE, Vol. VII, January, 1953 
DESCRIPTION: Rostrum almost 1.5 times as 
long as broad, with tip reaching 0.7 of length 
of first antennular article; rostrum and rostral 
base slightly rounded dorsally, not carinate. 
Orbital hoods not inflated. Orbital teeth 
reaching about 0.7 of length of rostrum. Or- 
bitorostral furrows slight, shallow, and broad; 
anterior margin between base of rostrum and 
base of orbital teeth very slightly convex, but 
at angle of about 30° to transverse line of 
body. 
Second article of antennular peduncle twice 
as long as broad, 1.4 times length of first ar- 
ticle, 1.5 times length of third article, Stlyo- 
cerite reaching slightly beyond end of first 
antennular article. Lateral spine of basicerite 
acute, tip reaching to end of first antennular 
article. [In the type specimen, the spines are 
developed asymmetrically, with that of one 
side as described and that of the other 
rounded anteriorly, shorter than the rostrum.] 
Lateral margin of scaphocerite only slightly 
concave; spine 0.8 longer than squamous por- 
tion; squamous portion reaching end of an- 
tennular peduncle. Carpocerite equal in length 
to spine of scaphocerite. 
Large chela heavy, 2.5 times as long as high, 
compressed, 1.6 times as high as thick, dis- 
tally sculptured. [For terminology of crests 
and grooves, see Fig. 17^“.] Superior crest well 
developed, terminating distally as strong acute 
tooth above dactylar articulation, proximally 
merging with superior margin. Transverse 
groove deep, abrupt. Superior groove deep 
and well defined. Plaque crest rounded but 
heavy, merging proximally with superior mar- 
gin of palm. Palmar groove with upper mar- 
gin poorly defined, lower margin abrupt. In- 
ferior crest rounded, strong, terminating as 
strong, acute tooth below dactylar articula- 
tion. Inferior depression shallow; shoulder 
low, gradual and rounded. Dactylus, occupy- 
ing distal 0.25 of chela, distorted, hammer- 
shaped, end bulbous, middle thin, crested, 
and twisted; outer surface of dactylus with 3 
grooves .armed with short stiff setae. Chela 
with numerous short to medium bristles on 
distal 0.5 of inner face. Merus twice as long 
as broad, with superior margin terminated by 
short obtuse tooth; inferior internal margin 
with 9 small movable spines and strong sub- 
terminal tooth. Ischium with rounded pro- 
jection on superior margin, inferior margin 
with 5 spinules similar to those on merus. 
Small chela in both sexes of peculiar form, 
with palm slightly over twice as long as broad, 
but with dactylus long, slender, and curved, 
1.4 times length of palm, when seen in lateral 
view (as in Fig. 20g) over 11 times as long as 
broad in middle; fingers curved in both planes, 
tips Cfoss slightly. Superior side of opposing 
face of fingers with thin ridge except where 
tips curve and cross; ridge with close series of 
fine rugae (Fig. 20/) ; on interior side of ridge 
opposing faces with orderly series of short 
stiff setae. Articulation of dactylus flanked on 
each side by strong acute teeth. Merus slightly 
over twice as long as broad, slightly heavier 
than that of large chela, with similar armature 
except spinules more numerous and subter- 
minal tooth smaller. Small chela 0.8 as long 
as large chela. 
Carpal articles of second legs with ratio 
10 : 9 : 4 : 4 : 6. 
Third legs with ischium unarmed. Merus 
3.4 times as long as broad, unarmed. Carpus 
0.5 length of merus, superior distal angle pro- 
jecting but rounded; inferior margin with 2 
nearly spine-like bristles in type specimen, 
with distal angle rounded, not projecting. 
Propodus 0.75 as long as merus, with 10 long 
slender spines on inferior and inferodistal 
margins. Dactylus 0.2 as long as merus, curved, 
with small secondary unguis on inferior 
margin. 
Telson 1.5 times as long as broad, base 1.7 
times as broad as tip; lateral margins some- 
what convex; distal margin arcuate. 
DISCUSSION: The 12 specimens of this spe- 
cies at hand show some variation, especially 
those of smaller si 2 e when compared to the 
large specimen designated as the type. The 
general form and appearance was the same in 
all cases, but in some of the smaller specimens 
