Alpheid Shrimp, IX — Banner and Banner 
Synalpheus paraneomeris Edmondson, 1923. 
B. P. Bishop Mus., Bull. 5:30. (2 speci- 
mens from Christmas Island). 
LOCALITIES: Canton Island: 2 specimens from 
BC 4; 1, BC 9; 11, BC 11; 3, BC 13; 7, BC 14; 
15, BC 15; 9, BC 16; 8, BC 17; 24, BC 18; 3, 
BC 19; 14, BC 24; 2, BC 25. Christmas Island: 
14 specimens. Johnston Island: 2 specimens 
from J-l; 2, J-5. 
DISCUSSION: Our specimens display the va- 
riation as discussed by Banner (1953:41; 1956: 
351) and Coutiere (1905:872). However, among 
the large number of specimens at hand there 
are 4 in which the rostrum and orbital hoods 
are greatly reduced. These specimens include 
1 from BC 17, part of a collection of 8; 1 from 
Tahiti (BD 2) from a collection of 104 speci- 
mens; 1 from Tonga (BT 17) from 2 speci- 
mens; 1 from Kapingamarangi #174 from a 
collection of 2 specimens. Since these strongly 
resemble the other specimens of the same 
species in their individual collections, we feel 
this reduction is simply malformation. 
S. sluiteri was described by de Man as "closely 
related to Synalpheus paraneomeris” However, 
de Man listed a number of characteristics in 
which the two species differed. Most of these 
differences, such as the proportions of the an- 
tennular peduncle, and the articles and dactyls 
of the third legs, are easily within the range of 
variation previously reported. Two possible dif- 
ferences remain: First, de Man stated that the 
"upper angle of basicerite subacute, a little 
prominent, though not spiniform.” This descrip- 
tion, without plates, could apply to the maximal 
development found in the specimens in these 
collections, or it may be markedly different. 
Second, the size of the ova, being 1.2-1. 5 mm 
long as opposed to about 1.0 mm for near- 
mature eggs of our specimens. As egg diameters 
are influenced by the maturity of the embryo, 
and as poecilogony is known among the syn- 
alpheids, not much reliability should be placed 
on this difference. Therefore we have tentatively 
made S. sluiteri a synonym of Synalpheus para- 
neomeris. 
Synalpheus kusaiensis Kubo (Journ. Imp. 
Fish. Inst. Tokyo, 34(1) :87, fig. 10, 1940) is 
quite close to S. paraneomeris in its general 
form, its appendages, and other characteristics. 
87 
However, the development of the squamous por- 
tion of the scaphocerite is markedly different 
from any specimens in these collections. In 
Kubo’s figures the squamous portion reaches 
only to the end of the second antennular article 
and is only slightly more than half as long as 
the lateral spine, while the squame in S. parene- 
omeris is variable. It usually reaches to near the 
end of the third article and is about two-thirds 
of the length of its lateral spine. In none of the 
specimens did the squame approach the condi- 
tion depicted for S. kusaiensis. 
Synalpheus charon (Heller) 
Alpheus charon Heller, 1861. K. Akad. Wiss. 
Wien, Sitzung. 44:272. 
Synalpheus charon de Man, 1911. Siboga 
Exped. 39a 1 (2) : 23 5, pi. 8, fig. 27-27c 
Banner, 1953. Pacific Sci. 7(1): 37, fig. 
11 a-k. 
LOCALITIES: 1 specimen from BC 17; 3, BC 
25. 
Synalpheus streptodactylus Coutiere 
Synalpheus neomeris streptodactylus Coutiere, 
1905. Fauna and Geog. Maid, and Laccad. 
2(4) :870, pi. 10, fig. I 1 . 
Synalpheus streptodactylus de Man, 1911. 
Siboga Exped. 39a 1 (2): 226, pi. 7, fig. 29. 
LOCALITY: Canton Island: 2 specimens from 
BC 8. 
Synalpheus tumidomanus (Paulson) 
Alpheus tumidomanus Paulson, 1875. Recher. 
Crust. Mer. Rouge, p. 101, pi. 13, fig. 2. 
Synalpheus tumidomanus Coutiere, 1909. 
U. S. Nat. Mus., Proc. 36:24, fig. 5. de 
Man, 1911. Siboga Exped. 39a 1 (2): 258, 
fig. 43-43d. 
localities: 1 specimen from BC 9; 2, BC 
10; 2, BC 25. 
Synalpheus coutierei Banner 
Synalpheus coutierei Banner, 1953. Pacific 
Sci. 7(1) :37. 
Synalpheus biunguiculatus Coutiere, 1905. 
Fauna and Geog. Maid, and Laccad. 2(4) : 
873, pi. 71, fig. 8. 
LOCALITY: Canton Island: 1 specimen from 
BC 8. 
