194 
PACIFIC SCIENCE, Yol. XI, April, 1957 
discussion: These specimens agree almost 
perfectly with Whitelegge’s original descrip- 
tion and with the later redescriptions. The 
only differences found are in the anterior 
body region when compared to the plate of 
the original description. In these specimens 
the rostrum is almost an equilateral triangle 
with straight sides and slightly rounded tip, 
while Whitelegge showed and described his 
specimen as having a slightly more narrow 
rostrum with concave sides and an acute tip. 
Further, the concavity between the base of the 
rostrum and the orbital spines is more pro- 
nounced. Finally a difference is found on the 
relative lengths of the antennular and antennal 
peduncles, for in these specimens the anten- 
nular peduncle is slightly longer than the 
antennal, rather than the reverse as described 
by Whitelegge. These differences are minor 
and most likely of no importance. 
Otherwise the specimens agree in the gen- 
eral form, the proportions of the appendages, 
the branchial formula and even in the posses- 
sion of a brown spot on corpus mandibulae de- 
scribed by Coutiere. 
The type specimens came from a mangrove 
swamp, and, previous to this report, were the 
only specimens known. The ones described 
from Arno came from a brackish pond. 
SYNALPHEUS Spence Bate 
Comatularum Group 
Synalpheus carinatus (de Man) 
Alpheus carinatus de Man, Arch. f. Natur- 
gesch., 53: 508, pi. 22, fig. 2, 1887. 
Synalpheus carinatus de Man, Siboga Exped. 
39^(2): 210, pi. 5, fig. 23, 1911. 
nec Synalpheus carinatus Pearson, Report on 
Pearl Oyster Fisheries, p. 83, pi. 2, fig. 9, 
1905. 
localities: One specimen at E-l-2, (com- 
mensal with Antedon , a sea lily). 
discussion: This specimen agrees perfectly 
with the characteristics given by de Man. The 
ova are 1.1 by 0.7 mm. The species will be 
discussed more fully in a later paper. Hiatt 
notes that the colot in life was brownish- 
black, the same as the host, Antedon . 
Synalpheus consobrinus de Man 
Synalpheus consobrinus de Man, Nederland. 
Dierk. Ver., Tijdschr. II, 11: 111, 1909. 
Synalpheus consobrinus de Man, Siboga Exped., 
39a x (2): 204, pi. 6, fig. 21, 1911. 
localities: One specimen at E-l-643. 
Neomeris Group 
Synalpheus charon charon (Heller) 
Fig. 3 
For synonymy, see Banner, 1956. 
localities: Two specimens each at E-l- 
617 and E-l-630. 
discussion: These four specimens are of 
the parent subspecies with the expanded base 
to the superior unguis of the third to fifth 
legs, and with a rostrum of uniform taper. 
One specimen from E-l-617, however, had 
a greatly expanded palm of the large chela 
with greatly reduced fingers. The condition 
is slightly more pronounced than that found 
in S. macromanus Edmondson (1925: 9), and 
at first the specimen was tentatively identified 
as that species. But S . macromanus has a conical 
inferior unguis on the third leg and is other- 
wise similar to S. paraneomeris Coutiere, while 
this specimen is identical to S. charon except 
for the form of the large and small chelae. 
The question is how this enlargement of the 
chela should be interpreted. When there was 
but the one specimen known as S. macromanus 
it was logical to consider the modification to 
be of specific worth; if this specimen were 
similar to S. macromanus , that species would 
have been considered as more valid. However, 
with specimens related to two different spe- 
cies showing a parallel mutation, I believe 
that the condition could best be interpreted 
as a growth anomaly that may occur in several 
species of this genus. The fact that this spec- 
