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PACIFIC SCIENCE, Vol. XI, April, 1957 
times the length of the first, instead of 23 
in the Hawaiian form, and 3.0 in Coutiere’s. 
The inferior distal tooth of the merus of the 
third leg is longer and more acute than in the 
Hawaiian form, therefore more like the type 
specimen. Finally, the Arno specimen is 
unlike both previous forms in the armature 
of the merus of the large and small chela. 
In Coutiere’s specimen the inferior internal 
margin of the merus carried a series of 
rounded serrations terminating in a strong 
acute tooth; in the Hawaiian specimens the 
serrations were lacking, and the tooth was 
weaker; in the Arno specimen the tooth also 
is lacking. The merus of the small chela was 
armed with a tooth in the type but in both the 
Hawaiian and Arno specimens the tooth is 
lacking. 
However, as the specimen agrees well with 
the general description of A. amirantei , these 
differences are considered to be at most sub- 
specific, and are more likely to be individual 
variation. 
Alpheus nanus (Banner) 1953 
For synonymy, see Banner, 1956. 
locality: Two specimens at E-l-306. 
discussion: Like the specimens from Sai- 
pan, the sole specimen with the chelae intact, 
a male, had spinules on the inferior internal 
margin of the merus; both large and small 
chelae had seven such spinules. The other 
specimen, a female, was lacking in both 
chelae. 
Alpheus paragracilis Coutiere, 1897 
For synonymy, see Banner, 1956. 
localities: One specimen at E-l-106; 2 
at E-l-285; 3 at E-l-387; 2 at E-l-617. 
Alpheus macrochirus Richters 
Alpheus macrochirus Richters, Meeres fauna der 
Insel Mauritius und der Seychellen, Deca- 
poda, p. 164, pi. 17, figs. 31-33, 1880. 
nec Alpheus macrochirus de Man, Arch. f. Na- 
turgesch. 53(1): 519, 1887. 
localities: Two specimens at E-l-306; 2 
at E-2-360. 
discussion: These specimens agree well 
with the short original description, with the 
characteristics given in de Man’s key and 
discussion (191 1) and with the three figures 
in Coutiere’s Les Alpheidae (1899, figs. 51, 
52 , 261 ). 
Crinitus Group 
Obesomanus Subgroup 
Alpheus lutini Coutiere, 1905 
For synonymy, see Banner, 1956. 
localities: Three specimens at E-l-106; 
12 at E-l-122; 30 at E-l-149; 5 at E-l-285; 
5 at E-l-290; 16 at E-l-306; 5 at E-l-387; 
5 at E— 1—611; 1 at E-2-343; 1 at E-2-382. 
DISCUSSION: One specimen preserved in 
formaldehyde has a body colored pale lemon 
yellow, intensifying to bright lemon yellow 
on the legs. The anterior region of the cara- 
pace and the antennular and antennal bases 
are orange-red; the small and especially the 
large chelae are lemon yellow at the proximal 
ends, changing to almost blood red at the 
tips. Some other specimens show a similar 
color pattern except that the red of the tips of 
the chelae is restricted to irregular patches 
surrounded by white. It is not known how 
well this pigmentation parallels that found in 
the living specimens. 
Crinitus Subgroup 
Alpheus alcyone de Man 
Alpheus alcyone de Man, Senckenb. Naturf. 
Gesell. Abhandl. 25: 870, pi. 27, fig. 61, 
1902. 
Alpheus aculeipes Coutiere, Fauna and Geog. 
Maidive and Laccadive Archipelagoes 2 
(4): 892, pi. 79, % 31, 1905. 
Alpheus alcyone de Man, Siboga Exped. 39a 1 
(2): 351. 
