90 
PACIFIC SCIENCE, Vol. VII, January, 1953 
ly longer in relation to the merus than they 
were in these specimens. 
These differences cannot be considered as 
of major magnitude because in related species 
(see C. paragracilis, C. brevipes, and C. clypeata) 
all of these characteristics were found to be 
quite variable. Possibly the most important 
difference is the lack of the tooth on the merus 
of the small cheliped, but, even if this were 
constant, it would not be sufficient for the 
erection of a new species. 
DISTRIBUTION: All five specimens in the 
collection came from Oahu: two from Hana- 
uma Bay, 20 feet deep, one off Waikiki, 20 
feet deep, and two from Nanakuli, 15 feet 
deep. 
Coutiere’s two specimens, both males, came 
from Amirante, 25-80 fathoms, in the Indian 
Ocean. 
Crangon nanus sp. nov. 
Figs. 30 a-n, 31 a-h 
Alpheus sp..^, Metalpheus, n. gen., Coutiere, 
Soc. Philomath. Paris, Bui. IX, 9(5): 23-26, 
1908. 
Alpheus sp.?, Metalpheus, n. gen., Coutiere, 
Linn. Soc. London, Trans. II (Zoology) 
17(4): 419-421, pi. 62, fig. 15, 1921. [The 
same description as above, but with fig- 
ures.] 
TYPE specimen: a female 9.0 mm. long, 
collected from coral in water about 10 feet 
deep at Hanauma Bay, Oahu (U.S.N.M. 
93458). 
DESCRIPTION: Rostrum short, acute, barely 
reaching end of first antennular article, about 
twice as long as wide at base, without distinct 
Carina, separated from orbital border by shal- 
low rounded concavities. Orbital border pro- 
jecting forward, rounded tips 0.7 as long as 
rostrum. Orbital hoods inflated. 
Antennular peduncle short and thick, with 
second article about 0.7 length of visible por- 
tion of first and slightly more than 0.7 length 
of third; second article about 1.3 times as 
broad as long. Stylocerite with tip of spine 
reaching beyond middle of second article. 
Outer flagellum not bifurcate. 
Basicerite of antenna very heavy, reaching 
beyond end of first article of antennular pe- 
duncle, 0.3 thicker than long. Lateral spine of 
basicerite acute, extending to tip of stylocer- 
ite. Scaphocerite with squamous portion 
broad and rounded, 0.8 as long as lateral 
spine; tip of lateral spine not reaching end of 
third article of antennular peduncle. Carpocer- 
ite heavy, subconical, almost 0.3 longer than 
antennular peduncle. 
Labrum massive. Incisor process of mandi- 
ble expanded, covering inferior portion of 
labrum and bearing numerous strong teeth; 
mandibular palp also expanded, with strong 
bristles in addition to teeth similar to those on 
incisor process. Maxillule and maxilla normal. 
First maxilliped with endite of basipodite ex- 
tended and contours rounded; no visible ar- 
ticulations in endopod. Epipodite of second 
maxilliped enlarged. Third maxilliped as 
shown in Figure 30c. 
Large chela strongly compressed laterally, 
twice as long as broad. Margins entire except 
for several small rounded eminences on in- 
ferior edge where bristles arise. Outer face 
with 2 shallow grooves extending 0.25 of 
length proximally, superior starting at point 
of articulation of dactylus, inferior near socket 
for piston of dactylus. Palm almost 4 times as 
long as fingers. Dactylus laterally disposed, 
upper margin strongly arcuate and closing 
across end of chela. Fixed finger very short, 
with terminal indentation to accommodate 
dactylus. Chela with scattered setae and bris- 
tles distally on inner face and on proximal 
portion of dactylus. Merus over 0.3 as long as 
chela, 1.5 times as long as broad, inermous, 
triangular in section, with inferior margins 
rounded. 
Small chela more than 0.7 length of larger, 
fingers as long as palm. Palm 1.5 times as long 
as high. Fingers curved, hooked tips crossing, 
immovable finger with thin knife-like ridge 
on inner edge. Distal portions of palmar edges 
and fingers with scattered groups of short 
