Alpheid Shrimp — BANNER 
139 
variable characteristics, at least between the 
present subspecies. 
I believe, therefore, that if the two sub- 
species are acceptable this species, too, should 
be made a subspecies of A. collumianus; how- 
ever, I have deferred the action until more 
specimens can be examined. 
Macrochirus Group 
Alpheus huikau nom. nov. 
Fig. ^a-e 
Crangon nanus Banner, Pacific Sci. 7(1): 90, 
figs. 30, 31, 1953. 
Alpheus nanus Banner, Pacific Sci. 10(3): 345, 
1956. 
nec Crangon /^^/^//rKrbyer, Naturhist. Tidsskr. 
4(3): 231, 1842. 
localities: 13 specimens, Station 827, 
USNM 194726, Nado Island, Likiep Atoll, 
Marshall Islands; collected by S. V. MacNeil, 
1952. One specimen. Station 2252, Ngaru- 
maoa Island, Raroia Atoll, Tuamotu Archi- 
pelago; collected by Maxwell Doty, Sept. 3, 
1952. 
DISCUSSION: It has been necessary to apply 
a new name to this species, which was named 
when the genus was called Crangon instead of 
Alpheus, because of Kr0yer’s use of Crangon 
nanus in 1842 for a species no longer in 
Crangon (or Crago) in 1953. The new name is 
from the Hawaiian, and means ’'confusion” 
or "mixed-up mess.” 
This group of specimens presents three 
points worthy of discussion. First, while the 
chelae on all of the females are like those de- 
scribed from Hawaii, the three males in the 
collection, all between 10 and 11.5 mm. in 
length, present an overgrowth of the fingers 
of the large and small chelae similar to that 
reported below for A. paragracilis Coutiere. 
In the large chela the dactylus is very elon- 
gate, acute, and curved; the fingers occupy a 
large proportion of the length of the chela. 
The inferior internal margin of the merus only 
bears two feeble spinules, fewer than those 
reported in specimens in the Marianas and 
a 
Fig. 5. Alpheus huikau nom. nov. a, b. Large and 
small chelipeds, showing overgrowth of fingers; c, 
third leg, merus and dactylus, anterior or medial 
aspect; d, e, third leg, dactylus, posterior and inferior 
aspects. 
Arno. The small chela of the males also has 
the fingers elongate and curved; the merus is 
armed with two strong spines and three 
weaker spinules; the inferior margin of the 
palm bears two strong spines and two weaker 
spines, a characteristic not observed in previ- 
ous specimens. This development of the 
chelae in the largest specimens is similar to 
that found for A. paragracilis. Unfortunately, 
neither this series of specimens, nor those 
from other islands, present a picture of grad- 
ual development as is found for A. paragra- 
cilis; however, a few other larger males, like 
those from Arno, do have a tendency towards 
the longer dactyli. 
Second, is the peculiar development of an 
extra chitinized piece proximal to the dactylus 
and inferior to the distal end of the merus of 
