96 
PACIFIC SCIENCE, Voi XVIII, January 1964 
A. courier ei is obviously closely related to A. 
bouvieri hululensis. Like A. hululensis it can be 
distinguished from A. levius cuius by the base of 
the rostrum and the long rostral carina. It will 
be discussed more fully in a later paper. 
A . ladronis Banner, while related, can be 
readily separated from A. levius cuius by the 
large chela. The top groove of the large chela 
in A . ladronis is shaped almost exactly like that 
of A. crassimanus , with the proximal margin of 
the groove gradually rounded instead of abrupt, 
as in A. levius cuius. Further the spine on the 
inferior internal margin of the large chela is 
large and subterminal in A. ladronis, while in 
A. levius cuius it is small and terminal In many 
of the males of A . ladronis one finds a balaeni- 
ceps condition, while in A. levius cuius, when a 
fringe of hairs is found it is thin and does not 
pass over the top of the dactylus. The merus of 
the small chela also bears a large subterminal 
spine on its inferior-internal border. The rostral 
carina is sharper and can be plainly seen from 
above, whereas in A. levius cuius the animal 
must be rotated to make the slight carina visible. 
Finally, although the proportions of the merus 
of the third leg are variable in both species, 
that of A. ladronis (20 specimens) averages 4.6 
times as long as broad, while that of A. leviuscu- 
lus averages about 4.0 times; the extremes of 
the ranges of the two species overlap. 
Alpheus crassimanus Heller 
Alpheus crassimanus Heller, 1865. Reise der 
Novara, Crust, p. 107, pi 10, fig. 2. 
LOCALITIES: Canton Island: 4 specimens from 
BC 18; 1, BC 19. 
Alpheus pacificus Dana 
Alpheus pacificus Dana, 1852. Acad. Nat. 
Sci. Philadelphia, Proc. 6:21. 
LOCALITIES: 1 specimen from BC 23. Christ- 
mas Island: 12 specimens. 
Alpheus strenuus Dana 
Alpheus strenuus Dana, 1852. U. S. Explor. 
Exped. 13:543, pi. 34, fig. 4. 
LOCALITIES: Canton Island: 2 specimens from 
BC 14; 14, BC 23. Christmas Island: 2 sped- I 
mens. 
Alpheus funafutensis Borradaile 
Alpheus funafutensis Borradaile, 1898. ZooL 
Soc. London, 1898:1013, pi 65, fig. 10. 
de Man, 1911. Siboga Exped. 39'a 1 (2):436. 
Alpheus hippothoe edamensis de Man, 1897. 
ZooL Jahrb. Abth. Syst. 9:757; 1902, 
Senckenb. Naturf. Gesell. 25:891. 
Alpheus acanthomerus inermis Lanchester, 
1901. .ZooL Soc. London, Proc. 11(1) : 564, 
LOCALITIES: Canton Island: 11 specimens 
from BC 14; 3, BC 18. 
DISCUSSION: These specimens agree well with j 
Borradaile s original pictures and description j 
and de Man’s ( 1911 ) further notes. Some minor 
variations were noted. The rostrum varied from 
one-half to three-fourths the length of the first i 
antennular article. The rostral keel always ex- 
tended back to the bases of the orbital hoods I 
but was less broad than that pictured by Borra- 
daile (fig. 10a). Some of the keels were quite 
sharp while others were slight. The tips of 
carpocerite and scaphocerite reached variously I 
from slightly beyond the end of the antennular . j 
peduncle to a distance equal to the length of the 
third article beyond that article. The squame, j 
which was narrow, sometimes reached to the 
end of the second antennular article or to the 
end of the third, and in all cases the spine ex- 
tended well past the end of the antennular 
peduncle. Borradaile in his original description 
remarked that the fingers of the small chela were 
elongate, yet he pictured them as stubby and 
shorter than the palm; our specimens agree with 
the figure. The small chela resembles very closely j 
that of A. parvwostris Dana. The most distinc- j 
tive characteristics of this species are the granu- 
lation and hairiness on the inside of both the j 
large and small chela. 
Alpheus parvwostris Dana 
Alpheus parvwostris Dana, 1852. U. S. Explor. 
Exped. 13:551, pi 35, fig. 3. 
LOCALITIES: Canton Island: 7 specimens from 
BC 1; 2, BC 2; 3, BC 3; 4, BC 4; 6, BC 5; 4, | 
BC 7; 6, BC 8; 7, BC 9; 25, BC 10; 2, BC 19; j 
10, BC 20; 3, BC 22; 2, BC 25. 
