Alpheld Shrimp, V — BANNER and BANNER 
14$ 
Island, Phoenix group, collected by A. H. Banner 
1 March 1954. Additional specimens from Eni- 
wetok, Vitilevu, Tonga tabu, Opolu, Tutuila, 
Aitutake, and Tahiti, all from surf zone on reef 
fronts except for one specimen from the lagoon 
at Eniwetok ( BE-2 ) ; this, however, must have 
been subject to surge for it came from the base 
of Pocillopora meandrina Verrill, a coral that 
never lives in still waters. 
DESCRIPTION: Rostrum acute with sides of 
uniform taper or with slight "jog” in lateral 
margins anterior to eyes; tip reaching to middle 
of second antennular article; slight carina in 
anterior half. Supracorneal teeth lacking; extra- 
corneal teeth acute, reaching almost to end 
of corneas; infracorneal projection short and 
rounded; pterygostomial corner rounded. Cor- 
neas of eyes concealed in posterior portion and 
laterally by extra- and infracorneal projections. 
Antennular peduncle short and heavy, with 
first, second and third articles subequal in length, 
second article as broad as long. Stylocerite long, 
lanceolate, tip reaching to near end of third an- 
tennular article. Scaphocerite broad and long, 
tip reaching beyond end of antennular peduncle; 
lateral spine strong, slightly exceeding squamous 
portion in length. Basicerite unarmed. Carpo- 
cerite reaching about to end of antennular 
peduncle. 
Chelae of large female symmetrical. Ischium 
bearing four strong spines on superior margin. 
Merus $.2 times as long as broad, unarmed; 
superior external and internal surfaces smooth 
and flat; inferior surface deeply excavate to ac- 
commodate propodus, short, 0.2 to 0.5 'length of 
palm (depending upon place measured), nor- 
mally greatly flexed. Palm subcylindrical, $.5 
times as long as broad, equal in length to 
merus, tapering slightly towards fingers; dactylus 
curved, one-quarter as long as palm with irregu- 
lar, large rounded teeth matching exactly with 
teeth on fixed finger. Chelae in allotype of same 
carapace length considerably larger and slightly 
asymmetrical with the right almost 10 per cent 
larger than the left; in both male chelae, merus 
and palm are markedly thicker than those of 
the female. Armature of fingers poorly devel- 
oped in smaller chela; on large chela fixed finger 
bearing single large rounded tooth and smaller 
tooth proximally, dactylus bearing two teeth in 
L — 
/mm. 
Fig. 2. Athanas marshallensis Chace. Chelipeds of 
various individuals from Eniwetok. a, 4.6 mm. $ ; 
b, 4.5 mm. $ ; c, $.7 mm. $ ; d, $.1 mm. $ . (All to 
same scale.) 
