128 
Small chela of male with palm almost 2.5 
times as long as wide, fingers 1.5 times length 
of palm; margins without grooves. Dactylus 
broad with opposing faces flattened and 
fringed with dense setiferous bristles, or ba- 
laeniceps-shaped; both dactylus and fixed fin- 
ger strongly hooked at tip. Carpus somewhat 
longer than broad. Merus narrower proxi- 
mally than distally, maximum breadth 1.5 
times minimum, article twice as long as broad 
at maximum breadth; armature like that of 
large cheliped except tooth on inferior inter- 
nal margin lacking. Small chela of female 
reported (de Man, 1909) as similar in form to 
that of male except lacking rows of setae on 
dactylus (therefore not of balaeniceps-shape) 
and slightly smaller in proportions. 
Carpal articles of second legs with ratio 
10 : 7 : 3 : 3 : 5. 
Ischium of third legs with strong spine. 
Merus 4.4 times as long as broad, with few 
setae along margins. Propodus slightly less 
than 0.5 length of merus, superior distal mar- 
gin with sparse long setae, superior distal 
angle projecting as tooth. Propodus 0.7 
length of merus with 7 spines on inferior and 
terminal margins, scattered long setae on in- 
ferior and superior margins. Dactylus 0.5 
length of propodus (or 0.3 length of merus), 
narrow, almost straight, tip acute, inferior 
surface flattened, superior surface rounded; 
rounded surface with 2 short bristles. 
Telson similar in form to that described for 
C. platyunguiculata (p. 130), 1.8 times as long 
as wide at point of maximum breadth; tip 
0.7 as wide as maximum breadth; postero- 
lateral spines slightly shorter and weaker than 
those of C. platyunguiculata. Tip of telson and 
distal lateral margins of inner uropod with 
weak spines similar to those of platyunguku- 
lata. 
Sole specimen in collection, male 28 mm. 
long; specimens reported by de Man {loc. 
cit.) to reach 51 mm. Color in life not noted. 
. DISCUSSION: Crangon rapax (Fabr.) was re- 
described and illustrated by de Man in 1909. 
The specimen from Hawaii differs from this 
PACIFIC SCIENCE, Vol. VII, January, 1953 
description in a few characteristics. The speci- 
mens are similar in general configuration, and 
the general relationship of the size, shape, and 
armature of the appendages. Some minor 
differences were noted in a comparison of 
this specimen with de Man’s description, for 
example: the rostrum reaches to the end of 
the first third of the visible portion of the 
first antennular article in this specimen, and 
from one half to two thirds of the length in 
de Man’s; the visible portion of the first 
antennular article is slightly longer and the 
third article is slightly shorter, when compared 
to the second article, than those described by 
de Man; the merus of the large chela is 2.6 
times as long as broad in this specimen and 
bears five spinules, while it is 3. 0-3 .5 times 
as long as broad and bears six to seven spinules 
in the described specimens; the ratio of the 
carpal articles is 10 : 7 : 3 : 3 : 5 instead of 
10 : 8-9 : 3 : 3 : 4; and so on. Two other 
differences may be of greater importance: the 
merus of the small cheliped of the male is 
broader and lacking the small terminal tooth 
on the inferior internal margin found in the 
specimens described by de Man; the carpus 
and propodus of the third leg in this specimen 
bears only scattered long setae, while de Man 
describes and depicts his specimens as being 
densely hirsute on these articles. 
When considering these differences it should 
be remembered that de Man’s description is 
based upon two specimens, a male 51 mm. 
long and a female 46 mm. long, while the 
Hawaiian specimen is only 28 mm. long. 
Therefore, it appears that all these dif- 
ferences are of minor importance and may be 
growth differences, or differences normally 
occurring in a population, or, possibly, they 
may be differences indicative of a geograph- 
ical subspecies of the parent C. rapax. How- 
ever, in my opinion, the description of this 
Hawaiian form as a new species or a new 
subspecies is not indicated on the basis of the 
present specimen. 
This species can be separated from C. platy- 
unguiculata, the only other Hawaiian species 
