Alpheid Shrimp — BANNER 
135 
Orbital hoods and rostrum depressed and 
rounded in lateral view. 
Antennular peduncle with first article 
slightly longer than second; second article 
about twice length of third article. Stylocerites 
heavy, with slightly rounded tips not reaching 
to end of first antennular article. Lateral spine 
of basicerite reaching almost to middle of 
second antennular article. Stylocerite with 
lateral spine well developed (that of right side 
distorted on type specimen), reaching to end 
of antennular peduncle; blade reduced, nar- 
row and reaching only to end of second an- 
tennular article. Carpocerite markedly longer 
than antennular peduncle. 
Large chela inflated, subcylindrical in sec- 
tion, 2.4 times as long as broad, tapering 
strongly to fingers. End of palm above dacty- 
lar articulation unmarked by any promi- 
nences. Fingers occupying distal quarter of 
entire length of chela, twisted from axis of 
palm; dactylus high, narrow, with superior 
edge rounded. Merus short, less than half 
length of chela, heavy, twice as long as broad, 
and strongly curved, with superior margin 
more strongly curved than inferior; superior 
margin not terminated in angle, but curved 
towards dactylar articulation. 
Small chela small but heavy, with palm 1.6 
times as long as broad, and 1.7 times as long 
as fingers; fingers tapering, slightly broadened 
proximally. Merus about as long as that of 
large cheliped, almost as long as small chela 
proper; superior margin curved but not as 
strongly as that of large cheliped; inferior 
margin straight. 
Carpal articles of second leg with ratio: 
10:2.5:2.5:2.5:6. 
Third legs with merus heavy, three times as 
long as broad, with inferior distal margin 
bearing numerous short spines which are us- 
ually concealed in normal side view by larger 
outer (or posterior) ridge. Carpus as long as 
merus is broad, superior margin ending in 
rounded tooth, inferior margin terminally 
armed with single weak spine. Propodus 0.56 
as long as merus, 4.5 times as long as broad. 
armed with 9 weak spines. Dactylus less than 
0.2 length of propodus, with strong taper and 
small ungui. 
Telson 2.7 times as long as broad at pos- 
terior margin, with anterior margin twice as 
broad as posterior; lateral margins slightly 
convex in middle, terminated by slight sub- 
acute angles; posterior margin with low 
convexity. 
DISCUSSION: In the nine specimens in the 
collection little variation is present except for 
the large chela and the armature of the merus 
of the third legs. In the larger specimens the 
length of the finger in respect to the chela is 
like that of the type, but in some of the 
smaller specimens the fingers occupy up to 
0.32 the length of the chela; the fingers of the 
small specimens are also more slender, being 
as much as 2.6 times as long as broad. It 
should also be noted that the merus of the 
allotype is more strongly curved than that of 
the type. The merus of the third legs bears 
from 3 to 9 spinules, with the small number 
being on the smaller specimens. 
It is also interesting that of this small col- 
lection, two males and one female (ovigerous) 
bear parasitic isopods on their abdomens. 
This form is plainly related to S. pachymeris 
Coutiere (1905^?: 873) and 5. hituberculatus de 
Man (1910: 294), and less closely to S. coutierei 
Banner (1953: 36) of the Coutierei group (see 
description under the name S. hiunguiculatus 
(Stimpson) in Coutite, 1898: 230). The last 
species differs from the first two and from this 
form in that the merus of the third legs is un- 
armed. This form differs from the first two 
species in that the margin of the palm above 
the dactylar articulation is unarmed and the 
palm itself is inflated, while in both others the 
palm is more slender and bears one {S. pachy- 
meris) or two (5. hituberculatus) rounded pro- 
jections above the dactylus. There are also 
slight differences in the armature of the an- 
terior carapace, but it is unlikely that these are 
of significance. In S. pachymeris and S. bituber- 
culatus (but not in 5. pachymeris cargadosi 
Coutiere) the stylocerites are longer than the 
