32 
peduncles. Orbital teeth acute, elongate, be- 
tween 0.4 and 0.5 as long as rostrum. Margin 
between orbital teeth and rostrum U-shaped. 
Antennule with visible portion of basal ar- 
ticle 1.2 times length of second and 1.3 times 
length of third. Second article about as long 
as broad. Distal ends of articles without con- 
spicuous setae. Stylocerite reaching end of 
first antennular article. 
Basicerite with both upper and lower outer 
spines developed and acute, lower consider- 
ably longer than upper, reaching beyond base 
of spine of stylocerite. Outer spine of scaph- 
ocerite acute, reaching to middle or near end 
of last article of antennular peduncle; squa- 
mous portion relatively broad and well devel- 
oped. Carpocerite reaching past base of an- 
tennular peduncle. 
Large chela only slightly compressed, mar- 
gins rounded. Palm twice as long as wide, 
with strong tooth above articulation of dac- 
tylus. Dactylus 0.3 as long as palm, strongly 
arcuate. Carpus of cheliped short. Merus 
slightly more than 0.4 as long as chela, twice 
as long as broad; superior distal margin ex- 
tended as slight rounded projection. Small 
chela with fingers 0.5 as long as palm, narrow, 
acute; palm slightly over twice as long as 
broad. Carpus somewhat smaller than chela; 
merus almost as long as chela, 3 times as long 
as broad. 
Carpal articles of second legs with ratio 
10 : 1.3 : 1.3 : 1.5 : 3.0. 
Third legs with ischium unarmed, slightly 
over 0.3 as long as merus. Merus also un- 
armed, 4.3 times as long as broad. Carpus 
slightly over 0.5 as long as merus, with tooth 
on superior margin and 2 movable spines 
on inferior margin. Propodus 1.1 times as 
long as merus, with 9 single and double spines 
along inferior margin. Dactylus 0.2 as long as 
propodus, 3 times as long as wide, inferior 
claw much smaller in diameter at base and 
much shorter than superior or distal claw. 
Telson less than 1.1 times as long as broad 
at base, tip 0.3 breadth of base. Tip strongly 
arcuate between lateral spines, with 8 setifer- 
PACIFIC SCIENCE, Vol. VII, January, 1953 
ous bristles; inner pair of lateral spines almost 
as long as width of tip. Dorsal spinules lo- 
cated near margins, at 0.5 and 0.75 length of 
telson posterior to articulation. 
Colors in life not observed. 
DISCUSSION: The two specimens studied 
were both males 8 mm. long. These speci- 
mens agree well with Coutiere’s description 
and plates except for two characteristics: First, 
the rostrum is described as equal in length to 
the orbital spines and shorter than the first ar- 
ticle of the antennular peduncle, whereas in 
these specimens it is longer than both. Sec- 
ond, the figures of the type specimen show 
the articles of the antennular peduncle to be 
relatively more broad than the articles in these 
specimens. However, as these characteristics 
were found to be very variable in S. paraneo- 
merts Coutiere, and as the specimens agree on 
other points, they are referred to this species. 
For a discussion of the points of difference 
between this species and the related S. hiungui- 
culatus (Stimpson) see the discussion under 
the latter. 
DISTRIBUTION: This species has been col- 
lected only twice, once by the "Albatross” 
off Laysan in 10-18 fathoms (the type local- 
ity), and by myself (the two specimens de- 
scribed here) from off Waikiki Reef, Oahu, 
from coral in 20 feet of water. 
Synalpheus biunguiculatus (Stimpson) 
Fig. 10 a-j 
Alpheus biunguiculatus Stimpson, Acad. Nat. 
Sci. Phila., Proc. I860: 31. 
(Nec) Alpheus biunguiculatus de Man, Arch. f. 
Naturgesch. 53: 502, figs. 6, 6a, 1887. 
(Nec) Alpheus biunguiculatus Bate, Challenger 
Rpt. 24: 562, pi. 51, figs. 4, 4o, 4z, 1888. 
(Nec) Synalpheus biunguiculatus Coutiere, Soc. 
Ent. de France, Bui. 11: 232, figs. 1-4, 
1898b. 
(Nec) Synalpheus biunguiculatus Coutiere, Fau- 
na and Geog. Maid, and Laccad. 2(4): 873, 
pi. 71, fig. 8, 1905. 
