98 
PACIFIC SCIENCE, VoL VII, January, 1953 
duncle. Outer margin of scaphocerite some- 
what concave. Lateral spine of basicerite ex- 
tending beyond rostral tip. 
Large chela compressed, slightly over twice 
as long as high. Palm with 2 indentations on 
outer face, longitudinal groove behind articu- 
lation of dactylus and vertical shoulder on in- 
ferior side slightly proximal to articulation. 
Distal end of chela rotated almost 45° to 
proximal end, dactylus opening somewhat 
laterally. Fingers slightly less than 0.3 length 
of palm. In addition to usual bristles on im- 
movable finger and dactylus, row of several 
groups of bristles on inner face near superior 
margin, occasional bristles on inner face of 
chela. Merus with superior edge produced as 
acute tooth, with series of 8-10 very short, 
conical spines along inferior internal margin. 
Small chela about 0.75 as long as large 
chela, slender; fingers curved, about as long 
as palm. Propodus with acute tooth at point 
of articulation of dactylus. Merus similar in 
form to that of large chela. 
Carpal articles of second legs with ratio 
10 : 7 : 4 : 5 : 7. 
Third legs with merus over 3 times as long 
as broad, with small acute tooth distally on 
inferior margin; carpus with distal projections 
of superior and inferior margins poorly devel- 
oped, rounded; propodus shorter than merus, 
strongly arched, with 6-10 strong movable 
spines along inner edge; dactylus biunguicu- 
late, with both claws strong and acute, distal 
claw twice as long as and broader at base than 
inferior. 
Branchial formula without mastigobranch 
on seventh thoracic appendage, without seto- 
branch on eighth appendage, without auxil- 
iary pleurobranch at base of third maxilliped. 
Largest specimens reaching 17 mm. in 
length; body with bright blue and smaller red 
chromatophores, blue predominating on 
body, especially on antennular and antennal 
bases, chelae, and caudal fan; tips of chelae 
yellow- green; eggs green. 
DISCUSSION: This species shows some vari- 
ations but they are not as marked as they are 
in some other members of the genus. Like 
most species studied, there is some variation 
in the proportions of the appendages, for ex- 
ample, the first 2 carpal articles of the second 
legs which vary in ratio from 10 : 5 to 10 : 7. 
The tooth on the merus of the third legs varies 
from a strong and acute tooth to a less well- 
developed tooth with the point approaching 
an obtuse angle. The squamous portion of the 
scaphocerite varies from broadly rounded as 
shown in Figure 33^ to narrow as shown by 
Coutiere for the type (1905, fig. 22). 
When this variation is considered, there is 
only one minor difference apparent between 
these specimens and those described by Cou- 
tiere, the difference being that the propodus 
of the third legs in the type bears only four 
weak spines instead of the 6-10 in the Ha- 
waiian form. 
A peculiarity of this and the related species, 
C. nanus Banner, is that these species, seem- 
ingly alone among the local crangonids, can 
have their eyes forced out from under their 
carapace. In the collection of both species 
available about 5 per cent of the specimens 
showed this condition, which is evidently 
caused by rough handling in collecting, a 
thing very easily done with specimens so 
small. Either too much pressure on the thorax 
or too much pull on the antennules and an- 
tennae will displace the anterior portion of the 
body so the eyes will be exposed partially or 
completely (see Fig. ^if-h for C. nanus). As 
there is usually no distortion of the body or 
the appendages accompanying this protru- 
sion, the condition could be confusing to an 
inexperienced worker. 
DISTRIBUTION : This is one of the most com- 
mon species about the Islands and has been 
collected from most of the seaward reefs of 
Oahu. It has been found in heads of coral, in 
coralline algae, and in the holdfasts of algae. 
Specific localities on Oahu where it has been 
collected, from water up to 20 feet deep, in- 
clude: Kaneohe Bay, Waimanalo, Hanauma i 
Bay, Black Point, Waikiki, Nanakuli, Moku- I 
leia, Kawela Bay. On Maui, at a similar depth i 
